Yamaha

To 250 Four Stroke or Not To 250 Four Stroke

Written By: Michael Allen

Some things in life are the way they are because they are that way; the sun is hot, the ocean is deep and gravity hurts. Moto also has things that just are the way they are; the smell of two-stroke race gas on cool days, early mornings bringing fond memories to a riders mind, having butterflies that give you that unexplainable exciting/nervous feeling just before the gate drops and the desire to constantly improve in the search for that elusive “perfect race”. While there are many great truths in the motocross world, there is one claimed “truth” that in my opinion is flat out wrong, has the potential to harm innocent riders whose macho ego overpowers their ability to look at themselves in the mirror and make a rational purchase. What I’m referring to is the falsehood that any vet type of rider needs to ride a 450 and if they don’t, they’re sissies who can’t handle a man’s bike. Well I’m here to hopefully shed some light, tell my story and give you a perspective on smaller bikes as a reasonable future purchase. 

We all know the rider: “I just bought a new (pick your color) 450 and I’m headed to Glen Helen to break it in on the main track. Back in my day I had a KX 500 that was a rocket ship and it’d rip your arms out of the damn sockets. Shit that’s a real man’s bike, I doubt the riders today could handle a 500 2-stroke. I’d buy one today if they made one, but I guess I’ll settle for this 4-stroke since I can’t buy the power I really need”. It doesn’t matter if you know this guy or you are this guy, the bottom line is that more than likely the moto memories you have of racing resembles a Toby Keith song; “you aren’t as good as you once was”. I’m just as guilty as anyone when it comes to remembering a better image of my racing self than probably ever existed, but once I learned the secret I’m about to let you in on, it made me feel like I was almost as good as I (thought) I once was. 

Once I was done racing (off-road) I got more into testing with Kris, whether it be off-road or moto I was open to riding anything. It didn’t take long before I realized that although I love going fast on the latest 450, I would always find myself holding on for dear life after the first few laps. I kept chalking it up to not being in as good of shape, maybe the track prep was bad, or whatever other excuse I could come up with that day to make myself feel better about my lack luster performance. It all came to a head at a local desert race that I raced on a 450. I figured how fast could the vet class be, I’d just ride the fast bike at a slower pace where I felt comfortable. I quickly found that at all of us that ride are wired similar! 

No matter if your five or fifty-five, if there is someone next to you holding the throttle wide open, your inner racer will beg you to keep your wrist twisted just a little longer than the guy next to you. We have all done it, the only difference is that this time it bit me at about 70mph as I sent myself cartwheeling across the desert disappearing into a cloud of dust and bike parts. One vomiting concussion, a broken collarbone, and a bruised ego later I realized that inner racer got the best of me. 

Once I healed up, I was itching to swing my leg back over a bike and once again prove to myself that I still had it; the only problem was that the first bike I was loaned to test was a YZ 125. I remember being grateful for having the opportunity to test, but at the same time thinking “why the hell am I testing a kids bike at 30 years old?” I squeezed into my size 32 gear (which was a little tight after sitting on the couch) swatted the toothpick sized kick start and headed over to the vet track for some warm up laps. After dusting off the cobwebs I started picking up the pace and that’s when it happened. I’ve always been told to listen to what your body is telling you and after a few more laps my old body could no longer be ignored. A sharp sensation hit me like a slap in the face, in fact it was a sensation that was not only felt on my face, it could be seen, so I went back to the truck to have a buddy give it a second look. When I pulled my helmet off at the truck a friend looked over at me and confirmed what I had been feeling, “what the hell are you so happy about?” The ear to ear grin on my face was reminiscent of Malcolm Smith in the closing credits of on any Sunday and that’s when it occurred to me. I hadn’t had that much fun on a dirt bike in years. Throughout that day I had probably rode more laps than I would in a week on a 450.

The reason for writing this isn’t to tell you that 450’s are worthless and nobody should buy one. In fact 450s are great for certain riders and scenarios, but I want you to be able to take a step back and objectively choose a bike that’s right for you, the type of rider you are and the type of riding you do. Every year I go to the Dubya USA vet nationals and see far too many older or unexperienced riders lining up with 50+ horsepower 450’s getting ready to roll the dice at 50 MPH going into Talladega. I say roll the dice because it’s not uncommon to see a crash just off the starting gate; like when Matthes got T-Boned damn near before the gate was even done falling. While it may sound cool to tell the cashier girl at the local bike shop that you ride a big bad 450, trust me, she’s about as likely to go home with you as you are to take Roczen’s place at Honda next year.

Obviously, everyone’s ability and preferences are different, but I think the average vet rider would be surprised at how much fun a 250f is on a motocross track. A lot of older riders haven’t even ridden a 250f since they ran their oil through the frame. I think the older crowd thinks of finicky carburetors, power that was comparable to 125s and bikes that are meant for kids transitioning to 450s. Unless you’re over 220lb, a 250f would not only have plenty of power for you on a motocross track, but you’d be amazed at how much longer you can ride when your shoulders aren’t being pulled out of their sockets and your forearms aren’t as hard as taking that little blue pill you may now need. In my opinion the perfect bike for a vet rider is the Yamaha YZ250F because out of the box it’s easy to ride, has the most user friendly low/mid power and a great fork for a broad range of riders. I’m not saying that the YZ250F is the only bike a vet rider should choose, it’s just that in my eyes it’s a quarter liter four stroke that is best suited for a vet rider. Maybe if you’re a little heavier, think about a YZ250, KTM 250SX or even a KTM/FC 350. Orrrrrr if you’re a little lighter and like revving, think about a KTM 150SX or YZ125. All I ask is that you do some research about what bike may be a good fit for you besides a 450. Again, I want to reiterate this by saying that 450cc+ bikes have their place in the vet rider world, just not in mine currently. If you’re going to get a dual sport or ride off-road in the desert, get a 450 if that’s what you’re in the market for. That being said, in most cases trust me, you’ll have more fun, be able to hold on tighter and ride longer on a smaller bike. Let your buddies talk all the smack they want because when you’re halfway through a moto and they’re pumped up like something fierce, you’ll cross the finish line with a smile looking forward to the second moto.





2022 Yamaha YZ450F Baseline Settings/Tips

The 2021 and 2022 Yamaha YZ450F’s are almost identical minus some suspension valving changes (increased mid-high speed damping), lighter rear wheel with a spoke lacing pattern that is a 3X not a 2X, lighter sprocket, as well as a lighter chain. For a bike that used to get some shade thrown its way in the professional motocross racing world, this Yamaha YZ450F is now the 2021 AMA Motocross Champ! This bike also has treated me really well in my racing goals the past couple years. I have won a Loretta Lynn’s title as well as a Vet World Championship on the exact same machine and haven’t had a huge maintenance list to go through.

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Is the Yamaha YZ450F the slimmest bike? No. Does it corner the best? No. Does it have the best cockpit? Absolutely not. I am the type of rider who would rather have stability than the best cornering machine! The Yamaha is a great middle of the road machine that does everything good. Below are some key settings, as well as mods, that I have rolled over into my 2022 YZ450F since I picked it up a while ago. These can help you drop your lap times, give you more comfort on the track and make a good bike, GREAT!

Suspension:If you’re sticking with stock valving the 2022 Yamaha YZ450F’s suspension, just know that Yamaha did some significant changes to the valving to get some extra hold up. This means that the baseline settings from 2021 are null and void. Yes, the fork is still slightly soft (once suspension is broke in) at times under hard braking at speed. Going slower on the action, stiffening the compression, as well as lowering he fork in the triple clamp really helps the whole bike remain planted around the track (with less low front end feel coming into corners). The comfort that the KYB SSS fork/suspension has is unmatched and the track toughness it provides makes your life so much less stressful on set up. This setting below will work for most riders ranging from 165-195 pounds with no gear.

Fork: 

Height: 3mm

Compression: 7 clicks out

Rebound: 9-10 clicks out

Shock:

Sag: 104mm

Low Speed Compression: 8 clicks out

High Speed Compression: 7/8 turns out

Rebound: 10-11 clicks out

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Important Spec Adjustments: 

Chain Slack: 55-60mm

Recommended Torque Settings: These recommended torque settings help the Yamaha's chassis be slightly more compliant over braking bumps/acceleration bumps.

Front Axle 80 ft. Lbs.

Pinch Bolts 15 ft. Lbs. 

Rear Axle Nut: 85-90 ft. Lbs. 

Engine/Power Tuner App: I have tried several maps on the YZ450F, but have always came back to the two below. The stock engine has a lot of bark (rpm response) from 0-10% throttle opening and for the tracks that we have out here (on the west coast) it’s too much at times. For you east coast riders try the “TP Magic Map1” as that should be enough bottom to mid range delivery to get you out of that soft soil, yet keep it manageable/linear to hold onto for a 20 minute moto (YES, I AM JEALOUS OF YOUR DIRT!). For all the rest of you, try the TP 3.0 map (on Keeferinctesting.com) as that is the map that I use 80% of the time. The linear/easy to roll on throttle delivery along with the longer pulling power that this map has makes it a tractor around the track. This makes connection to the rear wheel much more apparent with this TP version. Yes, these maps will also work on your 2019 YZ450F, so give them a try.…

Seat: If there is one problem area of the Yamaha it is the seat. The seat still breaks down quickly and can feel clapped out. This makes you feel like you're riding “in” the Yamaha and not on top. I am sticking with a standard height/density GUTS foam which is actually a little firmer than the OEM foam. The foam density will not break down as much as the OEM foam. 

MX3S or Pirelli MX32 Mid-Soft Front Tire: Yamaha will not want to hear this, but I feel the Yamaha corners better with a Dunlop MX3S or a Pirelli MX32 Mid-Soft front tire rather than the stock MX33. If you’re having trouble with initial lean into corners, get yourself a Dunlop MX3S or Pirelli MX32 Mid-Soft front and thank me later.

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Gearing:I tried a 13/50 gearing set up for all you novice riders, but it didn't work as good as the stock 13/49 set up. The stock gearing is just fine for 90% of tracks because the Yamaha’s engine has so much torque that it can pull third gear. Yes, even for you novice riders! Third gear is that “lugable” that you will not stall through corners, just make sure to cover the clutch lever.

Triple Clamps/Offset: The Yamaha YZ450F doesn't need aftermarket triple clamps nor does it need an offset change (but I am trying some aftermarket clamps soon to see if it causes any rigidity). The rigidity balance that the stock clamp has is a blend of comfort and performance that is hard to find with aftermarket clamps. Still having a hard time in corners? Don’t purchase clamps yet, chill down, simply go to a 102mm shock sag setting or go back to a fork height of 5mm. I suggest trying one or the other, not both at the same time. This keeps balance as well as keep the superb bump absorption of the chassis/clamps. Some other machines accept aftermarket clamps better than others, but this Yamaha has a lot of comfort/performance with the stock clamp. Don’t go backwards on your set up by purchasing parts you don’t need!

Muffler: I go back and forth between the Pro Circuit, FMF and Akrapovic muffler systems if I am not running the stock muffler. All these systems are smoother off the bottom end and pull more in the mid range than the stocker. I like this because it can actually calm the chassis down a little on acceleration bumps. There is nothing wrong with the stock system, but if you MUST get an aftermarket system go with one of these two brands. If you can find one these days! Tough to do right now. 

Vortex ECU: I haven’t been that vocal about this mod because it’s so hard to justify spending $800-1000 bucks on an ignition when the Yamaha ECU/Power Tuner app is so good. However after working on a ton of settings on the standard ECU, I decided to try the Vortex to see if I could make the power broader versus the stock ECU. I have worked on settings with Chad from XPR and I can say that we have spent many days at the track trying to make the Yamaha not spool up so quick (light or short crank/rod feel). You might be asking yourself, “what the hell is spool up”? The Yamaha has a quick revving light crank feel and sometimes that feeling can cause lack of rear end traction when exiting corners. The rear tire can light up when trying to exit corners under hard acceleration and that can get tough to manage at the end of a long moto. Now this is great when traction is high and the dirt is deep, but once the track gets rough, this Yamaha can be too much to handle compared to a KTM or Husqvarna. Adjusting the ECU via Power Tuner App helps a little, but for safety reasons Yamaha only allows certain parameters, but the Vortex ECU has a wider range of adjustment. Adding the Vortex ECU helps lessen engine braking and also gives the Yamaha a longer power character (almost a long rod feel). Now usually when you get less engine braking in any particular engine character you might feel a more free feeling engine, but with the mapping that Chad created, it makes the power more controllable with less pitching off throttle. The maps that we came up with help rear wheel traction out of corners, allows the rider to ride in third gear even easier, yet allows me to use second gear longer out of corners. Once I got a map (with the Vortex) that wasn’t too powerful, I have noticed an improvement in chassis feel when the track gets rough. The YZ450F can be pushed harder through bumpy conditions now that the delivery of the Yamaha is much broader with less engine braking. I would recommend anyone looking to get more connection as well as more power to get with Chad and ask for the Keefer World Vet map.

Weekend Race Set Up: Glen Helen 4/10/21

I always thought it would be cool to share the notes that I create after a race with the reader. 98% of the time I will input notes about each test bike/part I decide to race any given weekend. The part as well as the bikes change from time to time, but I always like to have a log of what I ran as well as the conditions of each race. Below is a brief breakdown on the bikes, parts as well as notes on how each performed or felt. Last weekend we brought two bikes to race (Yamaha YZ450F and KTM 250 SX-F). Below are two breakdowns of what was on each machine and how each machine fared in race conditions. Each time my son and I race, you can check back here to keeferinctesting.com every Tuesday (when we race the previous weekend)  for “The Weekend Race Set Up”.

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Track: Glen Helen Raceway

Kris Keefer

Terrain: Sandy top soil AM with hard pack in PM 

Start: Dirt

Avg Lap Time: 2:20

Total Number Of Motos: 5 motos (Three 20 minute plus 1 lap motos and 2 15 minute motos)

Weight At Time Of Race: 170 pounds w/o gear

2021 Yamaha YZ450F: 

Engine Hours 45.6

Mods/Parts: 

Tires: Dunlop MX3S/MX33 13.5/12.5 PSI 

Bars: Pro Taper SX Race Evo

Grips: Renthal Half Waffle Soft

Levers: ARC RC-8 Perch/Lever

Throttle: ZRT 

Rider Triangle: -5mm down and back peg position/stock bar height/rear hole

Gearing: 13/49 Renthal Sprockets/DID ERT3 Chain

Engine Mods: Vortex ECU Mapped By XPR/FMF 4.1 Full System

Engine Oil: Blud Racing 10/40 Pro Series

Fuel: VP T4

Holeshot Device: WC

Graphics/Seat: Era Moto Co

Suspension: Enzo Racing Test Fork/Shock Spec #KK145

Air Filter: Twin Air Power Flow Kit 

Plastic: Cycra Power Flow Kit

Results: 1st 40A (1-1-1), 1st Support Expert (1-1)

Notes: 

• GH World Vet ECU setting allowed third gear corners without on/off area 2 feel. Power was controlled and easy to manage late in motos.

• YZ450F feels slightly heavy on entry of shallow ruts.

• Fork has better comfort when ridden at race pace. Not too much comfort on initial stroke (light bump).

• Shock sag at 105mm made for acceptable balance, but sped up rebound +1 click to compensate for choppy conditions so rear can follow ground more.

• WC start device was better off the gate when set at 120mm for dirt start.

• Updated rider triangle (-5mm/-10 back pegs) allows for less leg fatigue. Legs were fresher at end of motos. 

• GUTS standard seat foam is firmer than stock OEM foam and last longer. (12.1 hours on foam and density still holding up).

Suspension Setting: 

Fork: (Spec #KK145F)

C: 10

R: 10

Height: 3mm

Shock: (Spec #KK144S)

LSC: 10

HSC: 1.25

R: 9

Sag: 105mm

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Track: Glen Helen Raceway

Aden Keefer

Terrain: Sandy top soil AM with hard pack in PM 

Start: Dirt

Avg Lap Time: 2:24

Total Number Of Motos: 2 motos (Two 15 minute plus 1 lap motos)

Weight At Time Of Race: 130 pounds w/o gear

2021 KTM 250 SX-F:

 Engine Hours 7.8

Mods/Parts: 

Tires: Dunlop MX3S/MX33 13.5/12.5 PSI 

Bars: Pro Taper Evo Suzuki Race Team

Grips: Pro Taper 1/3 Waffle Race Cut

Levers: Stock

Throttle: ZRT Grey Cam 

Rider Triangle: Stock

Gearing: 14/51 Sunstar Sprockets/DID ERT3 Chain

Engine Mods: Head Mod XPR Motorsports, Custom HC Piston, Vortex ECU Mapped By XPR/Akrapovic Slip On

Engine Oil: Blud Racing 10/40 Pro Series

Fuel: VP MR Pro 6

Holeshot Device: WC

Graphics/Seat: Throttle Syndicate

Suspension: REP Racing Test Fork/Shock Spec #AK3

Air Filter: Twin Air Power Flow Kit 

Results: 1st Intermediate Support 

Notes: 

• REP AER setting was set at 9.90 bar but we increased to 9.92 bar for hold up on hills.

• Fork comfort on bigger braking bump was better than stock setting and fork mid stroke improved with air at 9.92. 

• Fork comfort on small/light bump/accel was better with Pro Taper Evo bar versus Fuzion.

• Shock felt low on accel. Turned HSC in 1/4 turn. Helped balance

• Aden wants more low end hit so we will try FMF 4.1 system instead of Akrapovic slip on.

• 120mm holeshot device setting was better for light rider off dirt start.

Suspension Setting:

Fork: (Spec #AK3F)

C: 13

R: 11

Height: 5mm

Air: 9.90-9.92 Bar 

Shock: (Spec #AK3S)

LSC: 14

HSC: 1.5

R: 12

Sag: 105mm

2021 250 MX Baseline Stock Suspension Settings Bible

Here is your one stop shop for some baseline suspension settings for all (except the Suzuki) the 250 motocross machines. These settings are a great start for anyone between 150-180 pounds. If heavier springs are needed the below specs will specify this. If you’re asking yourself ,why not gives some specs for riders under 150 pounds, don’t fret, email me at kris@keeferinctesting.com and I can try to walk you through some options. -KK

2021 Honda CRF250R:

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In stock form the Showa suspension on the 2021 Honda CRF250R has decent comfort on de-cel bumps, but lacks a little hold up for riders ranging from 160-190 pounds. If you’re over 190 pounds going up a spring rate on each end is your ticket to a better handling CRF250R. After riding with this setting below at more than three different tracks, more than one time around, I figured out that this baseline suspension setting gave the 2021 Honda CRF250R the most “track toughness”. If you happen to feel like the fork is harsher (through the mid stroke) with this setting, simply open up the rebound (faster) back to stock setting. This will help free up the fork slightly under front end load (off-gas). The shock needs just a little more hold up under acceleration so simply going stiffer/slower on low speed compression/rebound gives the rider more comfort and added traction out of corners. I tried experimenting with high speed compression, but the Honda is finicky with high speed. Going stiffer on high speed compression (shock) put too much weight on the front end (fork) creating a harsher feeling front fork.

Fork:

Spring Rate: 4.8N/mm

Height: 3mm 

Compression: 6-7 clicks out 

Rebound: 10 clicks out 

Shock:

Spring Rate: 52N/mm

Sag: 102-103mm

High Speed Compression: 2-5/6

Low Speed Compression: 9 clicks out 

Rebound: 5 clicks out

2021 Kawasaki KX250:

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The 2021 KX250 to me has a better suspension feel than the KX450 as well a better hold up. The KYB suspension has a wide range of comfort for different size riders so stock springs should suffice unless you’re over 180 pounds. If you’re over 180 pounds then going to a 5.0N/mm fork spring (like last year’s fork) and 56N/mm rear spring and softening up the compression a couple clicks on each end and that should increase the comfort for you heavier dudes.

Fork: 

Spring Rate: 4.9 N/mm

Height: 4mm

Compression: 9 clicks out 

Rebound: 10 clicks out 

Shock:

Spring Rate: 54 N/mm

Sag: 102-103mm

High Speed Compression: 1.25 turns out

Low Speed Compression: 9 clicks out

Rebound: 11 clicks out 

2021 Yamaha YZ250: 

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Much like the chassis, the 2021 suspension feels firmer (compared the 2020), holds up more in the stroke slightly, yet still has that KYB free feeling movement (unlike a Showa feel where it moves less with a dead feel) that is very active on the track. That active feel translates into a a front/rear end that follows the ground well under small chatter and bigger/softer braking bumps. I did have to go a little firmer on both ends for my style of riding, but it didn’t take long at all to feel comfortable. Track Toughness of the 2021 Yamaha YZ250F is better than the 2020, but if you’re north of 180 pounds you might want to drop in a set of 4.8N/mm fork springs and live happy! 

Fork: 

Spring Rate: 4.7 N/mm

Height: 4mm

Compression: 8 clicks out 

Rebound: 9 clicks out 

Shock:

Spring Rate: 56 N/mm

Sag: 104mm

High Speed Compression: 7/8-1 turn out

Low Speed Compression: 8 clicks out

Rebound: 9 clicks out 

2021 KTM 250SX-F: 

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Always remember that a WP AER fork needs more time to break in than any other fork on the market. Your AER fork will need at least 5-6 engine hours to fully break in. If you feel like your fork is stiff/harsh before that, don’t fret yet, as this is a common feel among these forks. These KTM/Husqvarna/Gas Gas settings are for riders anywhere from 150-180 pounds. Lighter riders under 150 pounds will need a slightly softer air setting (around TKTK bar), but can use the same clicker adjustment readings. 

Fork: 

Spring Rate: 10.6-10.7 bar

Height: 5mm

Compression: 11 clicks out (with 10.6 bar) 15 clicks out (with 10.7 bar)

Rebound: 11 clicks out 

Shock:

Spring Rate: 42 N/mm

Sag: 102-103mm

High Speed Compression: 1.75-2 turns out

Low Speed Compression: 11 clicks out

Rebound: 12 clicks out 

2021 Gas Gas MC250:

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Fork: 

Spring Rate: 10.6-10.7 bar

Height: 5mm

Compression: 11 clicks out (with 10.6 bar) 15 clicks out (with 10.7 bar)

Rebound: 10 clicks out 

Shock:

Spring Rate: 42 N/mm

Sag: 102-103mm

High Speed Compression: 1.75-2 turns out

Low Speed Compression: 11 clicks out

Rebound: 11 clicks out

2021 Husqvarna FC250: 

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Due to the lower nature of the Husqvarna setting, we preferred to go a little stiffer with this set up to get more comfort on the Husqvarna suspension.

Fork: 

Spring Rate: 10.7-10.8 bar

Height: 5mm

Compression: 14 clicks out 

Rebound: 9-10 clicks out

Shock:

Spring Rate: 42 N/mm

Sag: 100-101mm

High Speed Compression: 1.5 

Low Speed Compression: 10 clicks out

Rebound: 11 clicks out 










































































































2021 Yamaha YZ125X Review From A Doctor's Point Of View

Dr. Gardner Tarlow has been my doctor for may years. Dr. T has helped riders like Tim Ferry, Ricky Carmichael, Travis Preston, among others over the years. Dr Tarlow also loves to ride and just like you and I finds his spare time at either the track or trails of Southern California. He has been bugging me to ride the YZ125 X since it came out last year so I thought it would be a good read to hear what an average Joe rider like Dr. Tarlow thought of the YZ125X. Here are his words. -KK

The YZ 125X was designed to be a closed course GNCC style race bike. It’s hard to imagine that a YZ125 with more bottom end, softer suspension, feather light and an 18” rear tire wouldn’t make a good GNCC race bike. Unfortunately, I don’t live on the east coast and my version of cross country is the high desert all the way to the foothills of the California mountain ranges. This means everything from sandy, rutted, rocky, hard soil with technical long hill climbs.

I was lucky when Kris gave me the opportunity to ride the 2021 YZ125X. To be honest, I had been bugging him to ride this bike since it came out in 2020. So naturally, it took me by surprise when he offered to let me ride the 2021 bike and write up a review.. Kris has a lot of options when it comes to having people test bikes and I didn’t imagine I would even make the list. I would consider myself an open novice for both motocross and enduro. I am not the target market for this bike. I already have my AARP old man card and at 5’10” and 190lbs without riding gear. It’s safe to say, I definitely put this 125s ability to perform well in the hills at a disadvantage.

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My first few rides were at Glen Helen Thursday practice, followed by multiple days at Cahuilla Creek. At 190lbs I’m not the ideal rider for any stock 125 motor or suspension. Most important for me was to assess the performance of the motor. I’ve rode a few different 125s and I was curious to see how the motor would differ. Out of the box, the jetting on the bike seemed appropriate and pulled cleanly in almost all riding situations. Under heavy downhill braking, the motor seemed a tad rich and hesitated with a slight bog. Turning the idle up and resetting the air screw cleaned this up somewhat but most likely the bike needed a change of needle height. The motor had a good bottom end with strong mid and top end performance. The top end power and pull seems to flatten out more than a regular YZ125 but then again, each bike is designed for different purposes. Although the top end isn’t the same as most track 125s, it pulls plenty well for track practice days or club racing. When I found myself in the wrong gear, a quick fan of the clutch and the motor lit right up, minimizing my poor riding technique. I gladly would give up the top end performance for the enhanced bottom end grunt, if that term can be used for a 125. I had forgotten how busy you need to be to keep a 125 on the pipe. The suspension in general was not designed for my size, however I was able to dial it in to where I could ride it without major issues. I eventually settled on Fork compression 10, rebound 7, forks 7mm up in clamps. Shock at 103-104mm race sag (free sag 20mm, need stiffer spring) low speed compression 10, high speed compression 2 and rebound 8. Despite the bike being significantly under sprung for me, the bike didn’t have any harsh landings or do anything to spook me or make me feel like I needed to back it down. Once I got the suspension dialed in, I was able to take any line I chose and the bike had that classic 125 feel and sense of just falling over into turns and railing ruts. For a bike that I was hoping could serve dual purposes, this little 125x was a blast at the track. With the exception of having a kickstand stare at me each time I came back to the pits, I would’ve thought I was riding any stock 125 that had a really good, broad powerband.

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I initially went to the track because I always think it’s easier to dial in a bike at the track versus out in the hills. I knew from a chassis and suspension perspective this 125x was going to be a blast on tight, undulating, rocky single track. The suspension being a bit under sprung was somewhat of a benefit and less of an issue for the slower speeds and rocky terrain. I actually liked that when I sat on the back of the seat the bike would squat a bit more and allow me to touch the ground, making it easier to pivot the bike more so than my properly sprung KTM 300XC. My bigger concern was that, despite being impressed with how well the 125x pulled up the hills at Glen Helen, could it pull the long hills we ride out in the high desert? Rolling off the throttle or chopping the throttle on a big hill climb is hard enough to recover from on a 300 but on a 125? I figured it would make for a long day of failed climbs. To my surprise, the 125x climbed extremely well. I think because you have to charge up climbs knowing you have to remain in the throttle forces you into more aggressive riding and this got me looking further ahead. That old adage of keeping the throttle on and using the clutch to regulate the power has never been truer than on a 125. I intentionally put the bike in unfavorable situations on numerous long climbs and to my surprise, was able to recover quite easily. There were some technical climbs that had changes of directions and I didn’t seem to dig holes with the 125x the way my bigger bore bikes sometimes do. The more I rode this bike in the hills, the more I actually enjoyed the challenge of climbing on a 125x. In rocky technical sections I felt like I could put the bike wherever I wanted and was able to rock, clutch and pop the bike through difficult sections that I might otherwise struggle in.

One of my last rides I ended up getting lost for an hour on an extremely tight, single tire width, rutted old single-track trail off property in San Diego county. This trail was literally non-stop rutted turning with little to no straights for an hour. The 125x was finally in its true playground and it was without a doubt the weapon of choice. The ability to muscle it around, diving in and out of tight rutted corners, ducking bushes, trees and dry ruts, able to lug 2n​d​ gear and still have the ability to pull out of sections with or without the clutch made me feel like I had a distinct advantage over my buddies on their bigger displacement bikes.

As much as I liked the track days, I enjoyed this 125x out in the hills even more. When it came to undulating, rolling, tight single track, I started thinking, “I need to buy one of these for my bike quiver”. There may be better bikes for both enduro and moto specific riding, but unless you’re planning on racing a 125 or simply can’t fathom having a bike with a kickstand, the YZ125X can absolutely serve as a dual-purpose track and very capable enduro bike. Now the only question is two-stroke versus four-stroke... but we all know the answer to that. -Dr. Tarlow

Randy Richardson's World Vet/2021 YZ250F Experience

#WhatTheHelen 

 It started with a text message. Steve Matthes sent a photo to Kris and me Sunday evening, November 1, of a freshly installed MICHELIN® StarCross® 5 Soft front tire along with the comment “World Vet prep”.  Ever being the jokester, my quick reply was; “When do I need to fly in?”From there, things escalated really quickly. Their plan, that I’d invited myself to be a part of, was to race the Saturday motos of the 36thAnnual Dubya USA World Vet MX Championships. The race is rich in history and continues to honor the late Tom White whose passion for motorcycles has inspired many. If you’re like me, hearing last year’s Medals Up episode of the PulpMX Show and the epic banter and laughter regarding the event was something I regretted missing out on in 2019 and I knew I couldn’t pass up the opportunity to be a part of this year’s event. Thankfully I was able to move some meetings around allowing me to take vacation days from my job at Michelin and redeem some Delta Sky Miles to book my flights for would certainly be an unforgettable trip. 

Being as much a fan of E-MTB’s as #StravaSteve , I flew into Las Vegas early Thursday morning to enjoy a nice mid-day ride with the Intense Tazer elite athlete before loading up and heading off for the drive down to the Hi Dez. Friday morning, I felt like I was sitting in on an episode of “Coffee With The Keefers” as I was, you guessed it, having coffee with the Keefers. Steve and I arrived to Glen Helen Raceway for the Friday practice and unloaded our matching 2021 Yamaha machines. Steve’s an official #blUcrU Ambassador and would be riding his YZ450F that is set up for his weight and/or speed. I’d be riding a new Yamaha YZ250F thanks to Mike Ulrich of Yamaha Motor USA that thankfully I didn’t even have to install Michelin tires on as my buddy Matt Sirevaag had already taken care of that. Thanks Vaag! After going out in separate sessions for our first practice, I snuck out in Steve’s second practice session and dropped in behind him. After witnessing 4-Time’s smooth style and line selection first hand, I don’t know how that 5thManitoba title escaped him. Once finished, I leaned my bike against Steve’s Honda Ridgeline truck as my back had begun aching after only two practice sessions and placing it on the bike stand was not an option. I thought Steve would be OK with this parking technique made famous by his favorite rider’s son Beckett Ferry. Boy was wrong as he was not happy with me, which was only the first of many times during our time together.

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We left the track then met Kris and Aden for lunch, where I told them about my lower back pain and limited range of motion. Kris quickly diagnosed this as Glen Helen Back as apparently GHB is a common condition due to the numerous square edges and braking bumps found throughout the famous hilly circuit. Needing numbers for my bike, Kris took us deep into the bowels of the Hi-Dez to a local shop called Mojave Motorsports in hopes of finding three packs of 2’s that I needed.  Though many motorcycle enthusiasts have shifted from brick & mortar dealerships to the larger click & order online retailers, I love visiting smaller family run Dealerships as they are the heart and soul of the power sports industry. Surprisingly enough, they had countless packs of 100% brand numbers available and I was able to purchase three packs for my number, 222.

After installing the numbers, I stuck pretty much every random sticker we could find onto the front fender in hopes of having the same style as DarksideMX’s signature graphics kit. The remainder of the day included visiting with all of the Keefer’s friends that dropped by unannounced, much to Steve’s annoyance. After Heather prepared us a home cooked dinner, which Kris put less effort into than I did parking the bike after practice, we sat around and listened to Kris tell us how a much needed rain was coming and how great the desert would be if we’d skip the race the next day. Though he made it sound appealing, I’d come to race and I went to bed early as my body clock was still on East Coast time. I quickly fell asleep hearing Kris in the living room still repeating his famous phrase “Desert Rats Assemble”!!!!!! We awoke to cool temps and overcast skies Saturday morning and my lower back was tighter than Jason Weigandt is with money. We piled into the Keefer Inc. Testing sprinter van and headed down I-15 and into the rain. We parked with the regular crew of Vaag, Janky Mike, Fireman Dave, and photographer Dallas Dunn who’d captured Steve and me riding in the perfect conditions during Friday’s practice. 

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We unloaded the bikes and set up the canopies for shelter from the increasing rain. Ironically, Steve helped with the tents. As the rain began to fall harder, I overheard Kris talking with everyone in the sprinter about how we could just load back up and go ride the Hi-Dez where it hadn’t rained in over 150+ days. Once the conversation made its way to outside to me, I quickly vetoed that idea by reminding them that I had never raced at Glen Helen in over 54yrs and that I hadn’t flown across the country to go ride around burned couches, dishwashers, and abandoned cars in the desert. 

My first Moto was race 8 on the day and I think it was possibly the worst conditions possible. Having just finished race number 7, Janky and Vaag gave me some quick pointers as I selected my spot on the gate. Their key message was to take the inside line in the second turn prior to a steep uphill that lead to the highest point on the track. While Steve’s personal starts may not be his greatest strength, he is a former factory mechanic so his support on the starting line was greatly appreciated. He told me all the great tips he used to share with Timmy Ferry, who was known for his mid-pack starts, so I was excited when Mike Alessi walked up to us. Known for his holeshots and let’s just say creative technics, I asked Mike what number I should count to before dropping the clutch. With a blank stare back at me, I realized that either my sarcasm had eluded him or he didn’t find it funny. Thankfully Steve laughed as I hate wasted humor.  

When the gate dropped, I got a good jump and began clicking thru the gearbox of the Yamaha YZ250F and secured a pretty good start against the mostly 450cc bikes. Mid-way thru Glen Helen’s first turn “Talladega”, I pulled an outer tear-off from the EKS Brand Goggles they’d professionally prepared for me and headed down towards that second turn.  I tucked the bike into the inside line just like they’d suggested and any hopes of me becoming the 23rdStar Racing Yamaha racer in 2021 went away quickly as I also tucked the front end mid-corner falling into the muddy slop. Though I was still suffering from GHB, I was able to somehow pick the bike up and remount to begin climbing the steep hill in first gear. Despite rumors about how much I revved the YZ250F, I did NOT remain in first gear the entire race. During the remainder of the first lap I had a few close calls with other riders as I began working my way back towards the position I was in prior to my fall. I could hear the Keefer clan yelling for me as I ended the first lap and I headed back onto the start straight. Entering that second turn again, I decided to move out to the middle line as that inside line and I didn’t seem to get along very well.

Though I’m not sure where the San Andreas fault-line is located, I do know that gravity is much stronger in the second corner as another sudden gust of gravity pulled me to the ground a second time. I yelled “What the Helen?!?”.  Frustrated with myself, I remounted once again vowing to not fall in that corner the next lap. I guess you could say the third time around was an improvement as I did make it thru the corner that lap only to come together about a third of the way up the hill with a rider who I was passing. Laughing at the situation rather than crying, I picked my bike up again, downshifted into first gear and somehow was able to climb up the hill ahead of the guy whom I’m sure I roosted with mud the entire way up.  I’m sorry Sir. The track was very one-lined and I was mostly able to keep the bike in that one line, though sometimes drifting unpredictably similar to Musquin in a rhythm section. I was so proud of myself for not falling in that turn on the fourth lap that I gave the Glen Helen crowd, or at least my friends that were watching and laughing at me, a big fist pump as I cleared the top of that hill for the first time without issue. Having caught and passed many riders during the race, many of them multiple times due to my crashes, I finished the 50+ Intermediate first moto with a 3rd. Thankfully, the only thing that was more clear than my problems staying upright was the clear vision provided by the EKS Brand Goggles Zip-Off system that worked flawlessly throughout the moto.

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I didn’t get as good of a jump in my second moto but my riding was much improved and I didn’t fall in that corner that’d been my nemesis during the first moto. Maybe the main reason was because immediately after my first moto, they’d blocked that corner with orange cones and re-routed the turn. You’re welcome everyone. One of the funny highlights of that second moto was me yelling “A-Ray” at a guy whose Akrapovic muffler was dangling down by the swingarm of his KTM450. I’d hoped that bringing attention to his misfortune would make passing him easier on the now even more one-lined track. Winning my class in the second moto was similar to when Lloyd rode the hog up to Harry in Dumb and Dumber as I’d totally redeemed myself! I was thankful that GHB was my only injury and I was proud of my 3-1 for 2nd overall results. 

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We all headed out to watch Steve’s final moto of the day and though he’d gotten off the gate without incident in his first moto, I definitely didn’t want to miss any opportunity to witness something like his 2019 performance. Steve’s start issues couldn’t escape him as the rider to his right inadvertently hung a hard left just over the gate taking down 4-Time in the process. Knowing the incident would be talked about after the race, on Monday night’s PulpMX Show, and for years to come, I sure was glad I’d captured it all on video as it’d be proof for any differences of open as to who owned what percentage of the Blame Pie. Ok, let’s be honest, I was really happy that I had the video so I could create edits with the countless songs that immediately began popping into my child-like mind. We all watched Steve continue to push forward all the way to the end of the moto as the lyrics “I get knocked down, but I get up again”and “Stop! Drop!” ran thru my head. Fast forward to Monday night’s PulpMX Show. Ever the perfectionist that has resulted in his fan favorite platforms, Steve was NOT happy with my derailing of his show by airing some of the videos I’d created. In the studio, there was more tension than in the spokes of a brand new set of Dubya USA wheels. If you didn’t get a chance to watch PulpMX Show #444, please do as it’s a classic with Steve angrily removing his headphones similar to Kenny Watson prior to one of his many mid-show walkouts. I truly am sorry Steve and you’re welcome Pulp Nation.  

I simply can’t thank the Keefers and the Matthes’ enough for their hospitality and for making this fun trip possible for me. Your friendships are a blessing and if you’re ever in Piedmont, SC, you’re more than welcome to stop by my house anytime, even unannounced. 

Optional 2020-2021 Yamaha YZ450F Maps

We have come across a couple more maps that we thought worked well in the 2020-2021 YZ450F. These maps feel completely different from each other, but if you’re looking to change your engine character a little, try either one of these maps for your desired delivery.

Smooth out the herky/jerky low end feel when rolling your corners with this map. Good for rough conditions, intermediate or hard terrain.

Smooth out the herky/jerky low end feel when rolling your corners with this map. Good for rough conditions, intermediate or hard terrain.


Increase your bottom end pulling power out of area 3 in corners with this map. Short shifting (shifting early into third) works on this map as well.

Increase your bottom end pulling power out of area 3 in corners with this map. Short shifting (shifting early into third) works on this map as well.



Top 6 Mods To The Yamaha YZ125

My 14 year old son Aden has been going back and forth between two different colored 125’s, but has seemed to take a liking to the YZ125 the most lately. I decided see which simple mods could help this Yamaha YZ125 two stroke the most in order to get him some extra ponies. These modifications aren't supposed to drain your wallet, but instead will give you the most bang for your buck. Aden needed to graduate from an 85 up to a bigger machine, but needed a bike that could handle well yet be fast enough to pull him around. We stayed clear of the 250F’s for now and settled on a machine that was easy to ride for his 5’6 115 pound frame. The YZ125 to me was the safest choice as it isn’t as fast as a KTM 125 SX and handles a little better on rougher tracks. However, he’s at a level now where his balls are dropping and the throttle is getting twisted harder, so getting him a little extra horsepower was beneficial when we went to deeper tilled up tracks. Here are six very simple mods that we have done to the YZ125 in order to get more horsepower, but also keep reliability as well as some money in my bank account. These mods are set in no particular order, but getting a pipe/silencer combo with any of these mods should be first on your list of “must haves”.

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FMF Factory Fatty Pipe/Shorty Silencer or Pro Circuit Works Pipe/304 Silencer: The FMF pipe/silencer combo adds a little more pulling power out of corners over stock, while the mid range on the FMF pulls slightly longer than stock and climbs farther through the top end. The FMF set up doesn't provide more over-rev over stock, but you will notice a healthier second and third gear pull down the straights. The YZ125 runs much cleaner with the FMF pipe/silencer (compared to stock) and looks stealthy as the silencer is hidden behind the number plate. I like that the FMF pipe comes with o-rings already installed and is ready to put on. The faster the track, the more this combination shined. MSRP: $397.00 www.fmfracing.com 

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The Pro Circuit Works Pipe and R-304 silencer has a deeper sound than the FMF/stock system and gives the YZ125 more bottom end than the FMF. The PC pipe/silencer has increased pulling power out of corners (mid-range) and just feels like it’s more torquey. When rolling the throttle on you’re able just to feel more meat as you’re able to shift the YZ125 a little sooner. The top end signs off a little earlier than the FMF, but the Pro Circuit allows the rider to have more freedom with his/her riding without having to cover the clutch as much. MSRP: $396.00 www.procricuit.com 

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VP T2 Pre-Mixed Race Fuel: VP Racing Fuels T2 blend is the company’s latest concoction of two-stroke motorcycle race fuel. Unlike their popular C12 two-stroke fuel, T2 is oxygenated in order to create more power. Recommended for either stock or modified two strokes, the VP Racing Fuels T2 comes premixed at a 40:1 ratio and is ready to pour right out the can. T2 contains no ethanol, which can help the engine parts in your YZ125 last longer. The 101 octane rating helps prevent against detonation, especially in high compression engines and works well with the Apex head. VP T2 gave the YZ125 better throttle response and a stronger bottom to mid range pulling power. At around 75 bucks for 5 gallons it’s an easy way to leave the ratio rite at home and get some more power for your next race. We didn’t have to change the jetting once poured in and the color of the spark plug was always nice and brown. MSRP: Check your local VP dealer www.vpracingfuels.com 

Jetting: Here are the 38mm Mikuni TMX jetting specs for sea level to 4000ft:

Main Jet: 430

Pilot: 40

Needle: 6BFY43-3

Clip: 2nd from top

Air screw: 2-1/4 turns out

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V-Force3 Reed Valve System: The Moto Tassinari reed valve system is one of the best mods you can do to wake up the Yamaha’s engine. If you do nothing else but a pipe/silencer and a V-Force you will be almost on a level playing field with the KTM 125SX. The V-Force3 system gives the Yamaha increased power, throttle response and also allows the Yamaha to rev farther than that of the stock reed cage system. The V-Force reeds also last longer than the stock reeds and resist chipping much better. MSRP: $158.00 https://store.mototassinari.com/ 

Gearing: Going to a 13/49 from a 13/48 proved to be a better choice for not only my four stroke riding style, but my son’s nervous novice throttle hand as well. Going to a 13/49 gearing allowed me to have a little more grunt from second gear, but also let me shift sooner into third. Third gear still felt long and usable, but just gave the YZ125 a little more throttle response/recovery through the mid range. 

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Apex Technical Innovations Cylinder Head: The objective of the Apex cylinder head is to improve upon the OEM combustion chamber shape to get more efficient combustion, while also offering interchangeability, as well as additional cooling from the billet design. A very important parameter of cylinder head design is the squish clearance. Because of manufacturing tolerances, the stock YZ125 head has a pretty large squish clearance for a 125 at around .050”. The point of the squish band is to shield and cool end gasses from the flame front to prevent detonation and to add turbulence to aid mixing and make for more efficient combustion. By having the squish clearance too big, like on the stock head, all the gas in that space is never forced to the combustion chamber and isn’t burned until too late of a crank angle to do effective work. This can cost you power, fuel efficiency, and make jetting more finicky. Also the flame front can creep into this space and actually cause detonation. 

The Apex YZ125 head is designed to have a nominal squish clearance of .035” which gives a great mix of reliability, safety, and performance. Apex then tuned the compression ratios, squish areas, and msv’s of each head profile to match the type of riding they’re intended for. The msv is the speed which the fuel air mix moves across the squish area into the combustion chamber and is another very important tuning parameter. Too high and the engine will be too peaky and risk detonation and too low and the engine will need excessive advance to run right and will be slow in general. The msv, compression ratio, squish area and squish clearance all affect each other, so a lot goes into getting the right combination.

Another unique problem that the stock YZ125 has is the way it has a flat top piston with a large bevel on the side. This makes conventional head designs not pair well with it. Normally one would have to choose an angle to match either the bevel part, or the flat part which leads to a compromise in how the squished gasses are dealt with. Using modern CAD and CNC machines Apex is now able to design the squish band of the head to suit the stock OEM piston shape. This way all of the fuel gets properly burned and you avoid detonation near the cylinder wall. 

Apex SX/XC insert has the highest compression, slightly higher than stock and has the highest msv that we’d advise running. This gives broad snappy power and a boost in power throughout the entire front side of the power curve. The mx insert has slightly lower compression than stock but an msv that’s higher than stock (but lower than the SX/XC) to let the bike rev out as freely as possible and give maximum over-rev. 

I installed the SX/XC Apex head in order to get Aden more bottom end coming out of corners so he could carry a taller gear. My son is only 115 pounds so having him carry third gear through corners wasn't a problem with the Apex head design. When I hopped on the YZ125, I couldn’t get over how responsive and clean the Yamaha ran with the Apex head. Apex said that we wouldn't get more top/end over-rev with this head design, but to me this head improved the power throughout the entire RPM range. Aden is more of a lugger (four stroke rider) than a revver and this allowed him to carry second and third more. Running a good race fuel like T2 or C-12 is recommended for this modification. MSRP: $200.00 https://www.apex-technical-innovations.com 

2006 YZ125 Craigslist Project

By: Michael Allen

Although I have access to bikes for testing throughout the year, there are times when it’s necessary (and nice) to have your own bike. In this particular case I was invited to Mexico with the Smith family (as in Malcolm Smith) to race the Tecate Enduro which meant I needed a legit bike. What I mean by “legit” is that most of the time test bikes don’t come with any paper work, like registration and even if they did, they would have the manufacturer listed as the owner. Needless to say that doesn’t necessarily fly with the border agents on either side of the wall.. If you listened to our podcast on this bike build you already know the history of my $1,800 craigslist find, but if you didn’t, here it goes… 

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In 2017 I bought this bike with only nine days before leaving for Mexico. It was rough around the edges, but ran well, so I just put some bars and levers on it before going down to race. Fast forward two years and I was still riding the bike and having a blast on it. I had updated the plastics with a Polisport kit, but other than that it was still as it was when it was purchased. In the winter of 2019, we got a lot of rain in Southern California and like everyone else, I was out enjoying the perfect dirt as much as possible. Admittedly I was a bit neglectful in terms of maintenance and wasn’t regularly checking my air filter (I figured there was no dust so how bad could it get). In the middle of a long sandy hill climb my bike went from screaming loudly to dying quietly in an instant. After getting home and taking the seat off, I realized that the air filter cage had fallen off the air boot creating a welcoming environment to all types of debris that was floating around inside the air box. I talked to Kris and he said “we should call Pivot Works so that we could test out one of their engine rebuild kits” and do a story on the process and products. 

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Wrench Rabbit is a branch of Pivot Works and they sell complete engine rebuild kits for most off-road motorcycles. At first I was a little weary of buying aftermarket parts for my personal bike because I have always been one to buy OEM parts for any bike I had owned in the past. That being said, after opening the box with all the gaskets, seals, crank, piston, and every other part necessary for the rebuild, I was pleasantly surprised at the quality of the parts. Prior to this rebuild I had never split cases and done a bottom end before so I enlisted the help of my older brother Robert to show me the ropes. I drove up to my parent’s house and he showed me step by step how to do the engine and it was surprisingly not too hard. All the parts fit perfectly and there were even parts that I didn’t use because I didn’t replace every seal in the bike (like the water pump). After the engine was rebuilt and back in the frame I decided to go for a trail ride with my buddy to break in the engine before heading down to Mexico. Our ride started out great with my bike running better than it ever had (I also re-jetted it). Everything was great until I washed out the front tire then was pile driven into the dirt by my freshly rebuilt 125. After the crash I was pretty bruised up (everywhere) and the bike was looking a little roached out. I called Keefer on the way home and after telling me that I needed to respect off-road riding more he asked me how bad the bike was. It’s not that it wasn’t rideable, but I figured that since we already had the engine done, why not turn it into a fun project build. We came up with the idea of turning it into a budget conscious bike build. 

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Since I had already done the engine, the next thing that needed work was the suspension. It had been gone through in the past by god knows who and I could feel when I rode it, that it needed help. We called Race Tech and they were more than willing to help with a rebuild, new springs, and gold valves/re-valve. I dropped off the suspension at Race Tech and a few days later I got an email that brought to light just how roached out this $1,800 craigslist bike really was. On top of the work that they were already doing it needed new inner fork tubes because mine were scratched and dented. The outer fork tubes needed to be re anodized and the compression posts needed to be replaced. Although I did have to spend an extra $750 I’m glad that Race Tech caught the problems, notified me, and fixed it right instead of trying to use old parts in order to cut corners. The company Race Tech uses to anodize the outers makes the fork tubes black instead of the stock gold color which initially I wasn’t sure about, but after seeing the black forks on the completed bike, I think they look really good. 

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The other main thing the 2006 was in need of was a fresh wheelset. After 13 years of abuse the stock wheels not only looked terrible, but the rims were far from straight anymore. We reached out to Dubya and after talking to John, we decided to use the stock hubs and have them cerakoted in a magnesium color. The look of the coating is awesome and only costs an extra $60. I decided to go with blue rims to give the bike a more current look and those blue rims were mated to the hubs with new stainless-steel spokes. The look of the blue wheels with the coated hubs looks almost as good as a super expensive wheelset, without breaking the wallet. 

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Once I got all the parts back, I bolted everything up just in time to make it to Mexico. The finishing touch was to put on the Throttle Syndicate graphics with all the companies who helped us out with the project. I’ve installed many sets of graphics over the years, but for some reason the Throttle Syndicate graphics didn’t give me any trouble at all. Thank you baby Jesus! With everything buttoned up we were on our way south with the great Malcolm smith, bench racing the whole way there (man that was cool). 

My first time really riding the bike was the morning of the race, so needless to say I didn’t get much time to get used to all the changes that were made. As I joined the other riders on my minute, all the thoughts started going through my head. I was wondering if I installed everything correctly and trying to remember if I tightened every single bolt. All of those thoughts left my mind the second the green flag fell and we were racing into the first turn. The first noticeable difference was the engine running perfectly crisp with seemingly perfect Pro Circuit jetting and a beautiful note barking out of the Pro Circuit shorty silencer. It didn’t have any hesitation or bog and once in the midrange (it’s a 125 so there is no real bottom to speak of) the engine pulled harder than it ever has. As we entered the rougher terrain, I was pleasantly surprised how much better the suspension worked than before. God knows what settings were in the old suspension, but it was a night and day difference. The small trail chatter was almost nonexistent except for the squarest of edges. Luckily I was able to slam into any square edge or rock since I had installed bib mousse tubes inside the Michelin StarCross 5 medium tires. Tecate doesn’t have a lot of whoops, but the ones that were there gave me a very balanced feeling on the bike. There were multiple times during the race where I would come across a g-out and to my surprise, I never had a hard bottoming sensation. The main place the suspension shined is when the speeds picked up. I don’t like running steering stabilizers, so when I race a bike that can handle high speeds, I’m thrilled! 

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Some other parts that I chose to run on my bike were Fasst Company Flexx bars. Some people don’t like them, but I love them on off-road bikes because they tend to take some of the harsh sensation out of the square edged bumps. I have a TM Design Works skid plate as well as their chain guide, which have both held up to plenty of abuse. On any bike I have owned with a cable clutch I always put a Works Connection Elite clutch perch and lever on because who doesn’t like an easier/buttery pull? I also have Works Connection radiator braces to help keep the radiators straight in case I goon out. I installed a set of Raptor titanium foot pegs on the bike for a little more grip and let’s get real, they look super cool. The only problem I had with the pegs is that with the small 125 kick starter, it tended to get stuck in the foot peg, when I would start the bike. I ended up making a small kick start extender so the lever would hit the back of the peg instead of getting stuck. Because this is an off-road bike I have an IMS 3.2 Gallon oversized gas tank with the bolt on screw cap, that can be changed to a dry break, if I ever feel like getting sketchy and racing a desert race again. 

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After the bike was back home and cleaned up (unfortunately it only looked amazing for less than a week) I really got the chance to appreciate how well it turned out. Everything that we decided to do helped the bike perform as well as it possibly could have. Unfortunately I was the one who held it back at the Tecate Enduro where I ended up fifth in the vet class and 30th overall. Although I didn’t finish where I would have liked, I was told by many fellow racers that were racing near my minute that the bike sounded unreal and they could hear me coming from a mile away with that sweet 125 tone. If you haven’t ridden a 125 in a long time, I would definitely recommend hopping back on one just to see how fun they are and if you find one for a good deal, maybe you’ll want to make a fun project bike out of one as well. If you can’t ride fast, you might as well sound fast.  

 

2020 Yamaha YZ125X/250FX Introduction

Editors Note: It’s hard to be in two places at once. Yamaha scheduled their 2020 YZ125X/250FX introduction in South Carolina after I booked a testing trip to New Mexico. With that being said, it’s not as easy as you think to find good people to help you give some quality feedback in this industry. I get countless emails/calls about wanting to help me with testing, but after I tell them to write me something on their own bike (as a test), send it in to me, so I can see if they can write, it usually ends in crickets. Most people just want to do the fun shit and go home, but there is more to testing than just riding the bikes. Colton Aeck and Dallas Dunn are two of only a few that I have within Keefer Inc. that I trust to go to an event like this. Colton is a quiet kid, but respectful and does what he says. He’s a privateer Supercross racer that doesn’t get to ride much off-road, so I thought the YZ125X/250FX machines would be the perfect fit (for him) to give you the reader, a perspective from an off-road newbie. Dallas is a single father that works as a heavy equipment operator that loves everything two wheels. He is your average blue collar dude that just loves to ride dirt bikes and is a bad ass at shooting photography as well as riding a BMX bike. I knew he would be a great photographer to bring this trip to life. Below is Colton’s story of how the event was, as well as his first impressions of how the bikes performed out in a true off-road setting. -KK

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Written By: Colton Aeck

Photos By: Dallas Dunn

For 2020 Yamaha completed their line of "X" off-road bikes by introducing the new YZ125X. They also made major changes to their YZ250FX model by updating it with all the changes we saw from the 2019 YZ250F motocrosser. This past week, Dallas Dunn and I were invited to the home and training compound of off-road legend and 7 time AMA National Enduro Champion, Randy Hawkins to test out the new bikes. 

When I first got the call from Keefer a few weeks back, I was pretty excited, but also a bit nervous. In the past few years I've spent the majority of my time riding and racing Supercross. Besides a few WORCS races back in 2012 as a B rider, I've had zero off-road experience. By saying that most of you probably know, off-road in the wet coast desert is almost the complete opposite of what you'd find in the tight woods at a GNCC or enduro on the east coast. As we pulled up to Randy's on Tuesday we arrived at a big open pasture that was surrounded on all sides by hills and woods. It was a brisk 28 degrees and I thought to myself this west coast boy is going to be coming out of his shell this week!

Randy and the crew from Yamaha set up 3 separate courses through the woods, each with a variety of what you might expect to see at a GNCC or National Enduro. We had a variety of open fire roads, ultra tight woods, single and double track jeep trails, steep uphills/downhills, creek crossings, and there was even a grass track as well as a motocross section. Other than some frozen fingers in the morning and having a run in with more than a few trees along the way, I can honestly say that it was some of the most fun I've ever had on a motorcycle. Throughout my life I've never understood why people would choose to ride or race off-road. Moto and Supercross just always seemed a lot better for me. Not to mention ripping across the desert wide open and eating a bunch of dust, just doesn't sound like much fun. Well, riding in the woods is a completely different animal, but riding these Yamahas in the woods of South Carolina has really changed my mind about off-road riding in general. In fact, it has my gears turning and thinking more about what I'd like to do after my moto career is over. 

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I strongly encourage all you moto guys out there, if you've never been trail riding out in the woods, find a place, find a bike, and go try it! Racing is my passion, but just like anything, if you do it enough it can turn into a job as well as burn you out on something that you love. This week I had the chance to get back to my roots and really remember why I love dirt bikes so much. Being out in the wilderness, with just yourself, your bike and a couple buddies really reminds you why you got started riding in the first place. It's been a long time since I've gone riding all day long and still wanted to keep going. The Yamaha crew just about had to pry me off their bikes each day just so they could prepare for the next day of riding. 

Enough about me and how much fun I had, you guys are here for the testing, so let’s get to it. Yamaha's goal with their "X" line is to have a purpose built bike that's ready to ride and race in off-road situations. They took their motocross bikes and made a handful of changes to each to better suit off-road riding. 

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The YZ125X shares most of its parts with the YZ125, with a few key changes, the biggest being engine and suspension. The X model has a different cylinder head shape, different powervalve shape/settings and a new ECU setting to match the engine changes. The suspension components, as well as spring rates remain the same, the only suspension change is in the valving. The YZ125X also comes with a kickstand, o-ring chain, reserve fuel petcock, 18 inch rear wheel and Dunlop AT81 tires. 

The goal was to make the YZ125X more capable for off-road and after the crap out of it, I think they did just that. The engine changes lead to a broader, easier to ride engine character for the tight, slippery terrain I was testing in. The engine hits sooner in the RPM range (although not quite as hard as a YZ125) and pulls longer on top. The engine is really what you'd expect from a 125. It's not a rocket ship, but it is a lot of fun to ride when riding in that sweet spot. I was really impressed at how well it climbed some of the steep hills on Randy's trails. In situations where a 250F or 450 would break traction and start digging a hole, the 125 would stay light and on top of the dirt, driving with forward bite.

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To my surprise the suspension worked really well for me on initial plushness and small impacts, but left me wanting more hold up as well as bottoming resistance on hard impacts (like creek crossings, or big G outs). Anything more than a medium size impact left me with an empty/soft feeling front and rear. I was able to get the fork and shock to bottom fairly easily when I started to feel comfortable and push it. Honestly though, soft suspension was what I expected from an off-road type of machine, but I am so used to such stiff settings on my SX bike that anything feels soft to me. I don't think a 180 pound Supercross pro is the target market for the YZ125X, but I enjoyed it a lot. Your typical younger generation off-road kid or even the older more mellow weekend warrior will have a blast on it while feeling like a hero through the trees, but may want a little stiffer suspension set up once broken in. I think this bike is the perfect tool for the younger generation moving up off minis or a newer, less experienced rider just starting out in off-road. The YZ125X is not intimidating to ride and is light enough that almost anyone is able to pick it up after a spill.

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The bike I enjoyed the most was the YZ250FX. The 2020 YZ250FX received all the changes we saw to its moto brother, the YZ250F in 2019. This means a completely new chassis and engine, plus all the off-road goodies you'd expect the X to have. The X differs from the standard YZ250F, with stiffer front engine mounts, (designed for off-road), GNCC specific suspension settings, a kickstand, 18 inch rear wheel, O-ring chain, skid plate, a check engine/low fuel light/sensors, oversized gas tank, and the big one, a wide ratio six-speed transmission. Also new for 2020 the X now utilizes the Yamaha Power Tuner app so now you can wirelessly adjust your fuel and ignition mapping all from your phone. Whether you're a beginner or a pro, chances are you can find a map that makes you happy out on the trail.

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On the trails, the YZ250FX was insanely fun to ride, I really had a hard time finding anything to critique honestly. I've never ridden suspension that was setup specifically for off-road and I was really surprised how well it would soak up small rocks and roots. I have experienced trail rides before on stiffer suspension and would find myself deflecting off everything on the trail. With the YZ250FX I’d approach rocks and roots expecting my front wheel to grab and deflect, but the bike would roll right over them with ease. It also had good hold up as well as bottoming resistance when riding over big logs or on hard impacts/landings. If I had to nitpick I would want a little more damping feeling through the mid-stroke just so I could start to push more when feeling comfortable. I know I would want to go faster, so I need to forecast my suspension settings accordingly.

 The YZ250F has been a class leader in the engine department for a few years now. I am not a 250F guy, but when I have tried the YZ250F in the past it blew my mind with how much torque it had. The X uses the same engine, so the torque feeling is just like how I remember it. It has a strong bottom end that pulls hard all the way through the RPM range. I enjoyed the wide ratio transmission and I found myself riding almost everything in 3rd gear, only using 2nd for really tight sections and occasionally on a steep hill climb. I can't really imagine a place where 1st gear would be very useful because after getting about 10 feet from the truck, I was out of first and never touched it again. The YZ250FX loves to lug and I have come to find out that lugability is important in the woods. The only major compliant I could come up with is that the YZ250FX is fairly difficult to start in gear. Unless you're in neutral, plan on it taking a few seconds to get the bike fired up or use the throttle a little bit in unison with the start button. Keefer is going to experiment with maps for you all and will post them up here on Keeferinctesting.com very soon. I will let him handle all of that stuff!  

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Just for fun, I also had the chance to ride the YZ450FX on our last day at Randy’s. Being a 450 guy, I thought I would love it, but honestly the extra weight and power was just too much for me in the tight woods. This made me appreciate the YZ250FX even more because of its fun and easy to ride nature. The YZ250FX is really easy to just jump on and ride and when you start to push it, you don't get the feeling that you're one whiskey throttle away from a head on with a tree. I really think the YZ250FX is the better all around bike for this type of riding and anyone from beginner to pro could have a blast on it. 

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Overall I was super impressed with Yamaha's additions to their "X" lineup. They are designed to be race ready for GNCC type riding and I think Yamaha did a great job. I know most of you Keefer Inc. readers are moto guys like me, but trust me when I say, “don't knock off-road until you try it”. Support your local riding spots and get out on the trails and ride. You'll probably be like me, re-kindling your love for dirt bikes and wondering why you didn't try it sooner! See you soon off-road! See you soon! -Colton Aeck







2020 Yamaha YZ450F World Vet National Race Weapon

I am a goal driven person and I like to set goals for myself, so I usually pick two big goals each year. The two goals I set out for myself for 2020 were as follows: to race the AMA Lucas Oil Pro Motocross nationals and of course the Dubya USA World Vet Championships at Glen Helen. We all know how the AMA outdoors went for me so we are moving on to Glen Helen this weekend. I chose to race two different bikes again this year at the World Vets, but wanted to have one of my race bikes fairly stock, just like your average weekend racer. Of course I chose the 2020 Yamaha YZ450F as my stock-ish race weapon, because it simply provides the most comfort and engine performance to go race in stock trim. I did manage to tweak a few things on the Yamaha and I wanted to fill you in on what you guys can do to your YZ450F. Doing these simple mods to your Yamaha could help you check those boxes next to your yearly racing goals. 

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Pro Circuit Ti-6 Muffler System: The exhaust note on the Pro Circuit Ti-6 is not near as loud as the stock exhaust note as the Ti-6 has a deeper and slightly quieter pitch, which I personally like more. The power delivery is slightly smoother down low, but only on initial throttle opening. This is a good thing for the 2020 YZ450F as the smoother initial delivery will help you roll your corners better. At 0-5% throttle position there is a slightly softer RPM response, which I didn't mind on nasty, dry, choppy tracks in Southern California. If I needed more bottom I simply ran a more aggressive map and that helped the “pop” I was looking for out of corners. I usually ran the TP 3.0 map with the Pro Circuit system and it made me happy with the amount of smooth roll on power I had. The rear wheel definitely feels more connected to my throttle hand and in comparison the PC system has more bottom end power than that of the Yoshimura system that I tested on the 2019 model. The mid-range is where I wanted more power out of the Yamaha and this is where exactly the PC system delivers. The meat of the Ti-6 power out of corners and accelerating down the next straight is much better than stock. I am able to use second and third gears longer with the PC system (compared to stock) and even though the low RPM response is slightly softer than the stock system, the mid-range RPM response is much more instant (AKA, recovery time). Mid- range RPM response is crisp and makes the Yamaha feel “lighter” when trying to hop over square edge choppy areas of the track when accelerating. Top end pulling power is as good as stock as the PC Ti-6. Another feature that I liked about the Ti-6 was that I was able to shift into fourth gear sooner on long straights and can use fourth gear longer than I could with the stock muffler. This power character that the Pro Circuit Ti-6 muffler provides is built for Glen Helen. Slippery corners, with long straights that require fourth gear. 

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Twin Air Power Flow Filter Kit: If you want to get rid of the somewhat janky stock air filter cage system of the YZ450F, go with the Twin Air Power Flow Filter Kit. To me the Twin Air YZ450F PowerFlow kit is the best all-around filter system for the YZ450F airbox. Why? With this kit, Twin Air replaces the stock sealing ring with an anodized aluminum mounting plate, gets rid of the backfire screen for uninterrupted airflow, adds an internal filter cage (that supports a bigger air filter), and finishes it off with a CNC-machined aluminum knob to hold the filter in place. This design brings in more air volume, increased air velocity, better sealing around the edges and better throttle response/bottom end pulling power. The downside is that some dirt particles are more prone to fall into your air boot if you're not careful with removing a dirty filter. If you do find yourself in that situation simply get a shop vac and suck out any particles that have found its way inside the air boot. If you DO NOT open/twist your throttle after the particles have found its way inside the air boot, then nothing will get past the throttle body and you’re engine will not get any dirt inside of it. The Twin Air Power Flow Kit takes a little more patience when changing filters, but can add power to your YZ450F. Just be sure to check air boot and use suction as needed.  

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Mapping: With the handlebar mounted map switch I found my two favorite maps to go between while racing. I use the “Exciting Power Character” map in the morning hours while the track is fresh and the “TP 3.0” map in the afternoon when it’s drier and beat up. 

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Stock Suspension Setting: Since Glen Helen gets abnormally more choppy on “Vet Weekend” I try to stick with softer suspension for comfort, so I am sticking with the stock suspension. Bumps form differently when more older/slower riders are on the track so having a softer setting could make your second moto way more comfortable than having a stiffer set up. Glen Helen doesn't have huge jumps nor does it get ripped very deep for vet weekend so we rebuilt/freshened the stock suspension and are using these settings:


Fork: 

Height: 5mm

Compression: 10 clicks out

Rebound: 9 clicks out

Shock: 

Sag: 103mm

Low Speed Compression: 10 clicks out

High Speed Compression: 1 turn out

Rebound: 9 clicks out 

Tall Seat: Once the stock YZ450F foam is broken down (around 15 engine hours) it can feel like you’re riding in the bike too much instead of on top of it and that can make the rider triangle feel uncomfortable for riders 5’11 and up. Installing the GYTR taller seat helped with the rider triangle feel for me when sitting. The seat wasn’t so tall through the middle where I felt like I was too high above the machine, but instead had a firmer feel than stock and enough height to help my form on the bike. I am fan of the Yamaha stock bar bend, but with the stock seat it can almost make the bar bend seem too high at times because of that pocket feel. With the taller seat it puts me into a more neutral/attack position coming into corners, which forces my arms to stay bent, instead of dropping down and relaxing too much.The transition from sitting to standing is better and requires less effort under throttle. Seat bouncing is needed at times, but when you’re taller (and old), it’s tough to get off your ass to soak up a jump immediately out of a corner. Having just that little bit of extra foam in the middle of the seat makes it easier for me to get off my ass because I don’t have so far to travel to stand. Yes, 3/4 of an inch doesn’t seem like a lot, but it actually makes a difference. In fact I think a 1/2 an inch would have been enough, but I am not hating on the flatter profile of the 3/4 inch height. I had a couple other testers try this seat that were shorter than me (5’9-5’10) and they even thought it was better for them. The gripper cover that comes stock on the GYTR tall seat is as good as the stock seat, but if it was me, I would be looking into getting a GUTS ribbed cover for increased traction while rolling the throttle on out of corners. GUTS seat covers are made well and last.  

Extras: 

Gearing = Stock 13/49

Grips = Stock (Yes, stock grips!) 

Tires = Dunlop MX53 front tire/Dunlop MX33 rear tire 

Fuel: VP MR Pro-6

 

2020 450 MX Bracket Shootout "The Podium"

As long as I can remember, shootouts have been a staple in our industry. I remember being an 11 year old kid reading about the 1987 80cc Shootout in Dirt Rider Magazine and then proceeding to ask my dad for a Honda CR80 because it was the winner. Little did I know that just because a machine wins a shootout doesn't necessarily mean it’s the best bike for you. There is a lot to consider when purchasing a bike, but it’s fun to see which bikes have certain standouts or feels best when riding them all back to back. Fast forward to 2020 and the format to these shootouts haven't changed much, so I thought it would be time to try something different. I decided to do a bracket style shootout (similar to a college basketball format), with two bikes/three riders per bracket, with the winner moving on and the loser going home. This style of shootout removes a lot of biases as well as gives test riders more time to dissect each bike with only two bikes for each test. Let’s face it, not every guy in this shootout is fit, so having less bikes to test at one time is probably best. I personally ranked each bike on how I felt each machine performed (my opinion, not fact) out on the track and used that ranking to create the bracket for the other testers in this shootout. The bracket battles went as such:


Yamaha Vs. Suzuki = Yamaha Wins

Kawasaki Vs. Honda = Kawasaki Wins

Husqvarna Vs. KTM = KTM Wins


Final Bracket:

KTM Vs. Kawasaki Vs. Yamaha 


The 450 MX Bracket Shootout is done and dusted and we now have our podium for 2020. Below are the top three bikes from the shootout as well as some brief highlights, opinions, quotes, and why the other two machines didn't win. If you would like to dive more into the opinions of the riders as well as get more insight on each bike, head over to the “Podcast” section on keeferinctesting.com and simply click on “Keefer Tested” to listen to each bracket breakdown. They are not only informative, but a fun listen. Stay tuned for the 4th, 5th, 6th place rankings coming next week! As always we are here for you if you need us by emailing your questions to kris@keeferinctesting.com


Winner: Yamaha YZ450F

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Why It Won: The Yamaha YZ450F has the most track toughness (well rounded) and is the easiest to set up to make a wide variety of riders happy. With the changes Yamaha made to the chassis/engine for 2020 it made big blue corner with more front end positivity and gave each rider more throttle to rear wheel connection. The engine is strong yet very usable and can pull you around the track in a higher gear without a lot of clutch abuse. The Yamaha Power Tuner App is easy to use to alter the power character if need be and the suspension is simply the best in class with the most comfort/performance. Each rider commented on how they didn't have to search for smoother lines in the afternoon when the track got bumpy as the Yamaha provided a safe feel on rough terrain. They could simply hit the rough line with confidence knowing that the YZ450F would do most of the work.  


Why It Could Have Lost: Yamaha still has some work to do when it comes to ergonomics. Although the bar mount height is much better for 2020, the position it’s in (forward hole) wasn’t well perceived by most riders. Most riders went to the back hole/forward mount position for a better feel in corners. The seat has a pocket that makes you feel like you’re sitting in the bike rather than on top of it and can feel cramped for taller riders (6’0 and up). 


Rider Quotes: 

“The Yamaha has the most comfort for my bigger size. I look for comfort because I don’t get to ride all the time, but when I do ride I want, I want to be able to be in control” -Kelly Gelhaus 5’10 220 pound Senior Intermediate 

“This is the best stock engine I have ever ridden” -Colton Aeck 6’0 175 pound Pro

Second Place: Kawasaki KX450 

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Why It Got Second: The Kawasaki KX450 is the only other bike in the class that can rival Yamaha’s comfort on rough tracks. If you’re looking for a stable machine with the most chassis comfort available, then the KX450 is your bike. The bump absorption of this Kawasaki frame is unmatched, but the soft fork really holds it back. Riders from 165 pounds and up all commented on how the fork would dive too much on de-cel and that hurt the Kawasaki’s corner entry at times. The KX450’s engine character has an exciting rpm response, but transitions to a smoother roll on power delivery once exiting corners. This is good and bad depending on each tester. Some testers wanted more low end, but others praised how it easy it was to control coming out of corners. Kawasaki’s mid to top end pull is strong, but not quite as meaty as the Yamaha, especially when going up longer hills or with tracks with deeper soil. Most riders commented on how easy they could hit flat corners because of the amount of traction they had with the Kawasaki. The Kawasaki feels lighter than the Yamaha, but the Yamaha had more cornering stability on rougher/longer ruts. 


Why It Could Have Won: The Kawasaki could have won if they went up on the fork spring rate, which would have added to the already great straight line stability, but would have also added to an even better cornering character (initial lean in). The 250mm rear disc is touchy and sometimes can lock up too soon coming into corners. The amount of stability the KX450 comes with along with its newfound neutral cornering makes for a machine that is liked by almost all testers. 

Rider Quotes:

I can’t believe how good this bike really is. The Kawasaki is able to come down these steep Glen Helen hills with ease. I felt confident right away on this bike” -Kenny Day 5’7 160 pound Vet Pro 

"The KX450 may not have the motor like the Yamaha, but the medium lean, on throttle traction I get with this frame makes me want to choose it over the Yamaha”. -Joe Oehlhof 5’10 195 pound Vet Pro


Third Place: KTM 450 SX-F

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Why It Got Third: There are plenty of things about the KTM 450 SX-F that make it a great bike. An engine character that is buttery smooth down low, yet has the longest mid-top end pulling power in the class. A power that is so deceiving that it might make you think you’re not going to clear an obstacle, but you end up over shooting it because of the amount of traction it comes with. A lightweight feeling that can’t be beat when deciding to make sudden line changes. If you want to cut down from a blown out rut or berm, the KTM does it the easiest. Brembo brakes that allow you to dive into corners harder with more control and that allows for quicker lap times. With all this being said the KTM gets rated down to third because the AER fork simply doesn't have the front end traction or comfort the bikes in front of it has. This made each tester leery of really pushing the orange machine on rougher tracks. The AER fork also doesn't have the consistency of a spring fork so you will have to continue to chase settings throughout the day. 


Why It Could Have Won: The KTM 450 SX-F accepts a wide range of rider, but if you’re a novice rider that is scared of huge power, the KTM will not rip your arms out and get you fatigued like other 450’s can. If you’re a more aggressive rider the lightweight chassis feel along with the connectivity to the rear wheel allows for the faster rider to push their cornering to a new level. Most riders in this shootout said that rolling on the throttle earlier through corners was a common occurrence when they were on the KTM. If KTM could get more consistency and/or more comfort out of the AER fork, the other manufactures would be in a world of hurt. Or how about if they just went to a spring fork? Now we are talking!  


Rider Quotes:

“The KTM easily could of won this shootout for me, but the AER fork feel harsh on slap down-Kelly Gelhaus 220 pound Vet Intermediate 

“I am usually a 250F type of rider, but the way the KTM 450 SX-F delivers its power makes me want to ride a 450! It’s so easy to ride! -Tod Sciacqua -155 pound 5’8 Vet Expert 

Any one of these bikes can be great for anyone reading this article. By listening and reading the information we have up at Keeferinctesting.com you can make an educated decision on which bike fits your riding style/needs. Also, maybe more important, is which one fits your pocketbook? If you’re looking to get the best deal on any one of these bikes please email me at kris@keeferinctesting.com and we can get you in contact with David over at Power Motorsports.

2020 Yamaha YZ450F Start Up/Baseline Settings/Tips/Tricks

The Yamaha YZ450F is winning a lot of shootouts this year with it’s completely redesigned frame and engine layout as well as a stiffer suspension package that makes the bLU cRU ride a race-ier type of machine. I am fan of machines that are fun to ride as well as make me want to ride faster and this 2020 YZ450F does this for me. Over the past few weeks I have really got to know this bike better by racing it and riding it all over Southern California. Here are some of my settings that hopefully can help you go faster at your local track. 

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Suspension: In stock form the 2020 Yamaha YZ450F’s suspension settings are still slightly soft (once suspension is broke in) at times on bigger bumps at speed. Going slower on the action as well as stiffening the compression really helps the whole bike remain planted around the track. The comfort that this KYB suspension has is unmatched and the track toughness it provides makes your life so much less stressful on set up. This setting below will work for most riders ranging from 170-200 pounds. 


Fork: 

Height: 5mm

Compression: 7-8 clicks out

Rebound: 8 clicks out


Shock: 

Sag: 103mm

Low Speed Compression: 8 clicks out

High Speed Compression: 3/4 turns out

Rebound: 8 clicks out 


Engine/Power Tuner App: I have tried several maps on the YZ450F, but have always came back to the two below. The stock engine has a lot of bark from 0-10% throttle opening and for the tracks that we have out here (on the west coast) it’s too much at times. For you east coast riders try the “Keefer 1” map as that should be plenty enough bottom to mid range delivery to get you out of that soft soil, yet keep it manageable/linear to hold onto for a 20 minute moto (YES, I AM JEALOUS OF YOUR DIRT!). For all the rest of you, try the TP 3.0 map as that is the map that I use 80% of the time. The linear/easy to roll on throttle delivery along with the longer pulling power that this map has makes it a tractor around the track. I raced four motos with this TP 3.0 map and pulled 3 out of 4 holeshots at Glen Helen. The connection to the rear wheel is much better for 2020! Yes, these maps will also work on your 2019 YZ450F…  

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Muffler: As of right now I am running the stock muffler system, but currently have a Akrapovic, Pro Circuit, and FMF in the shop to test, so hold tight to see if any of these are better than stock. There is nothing wrong with the stock YZ450F muffler so don’t be scared to run a stock muffler on your Yamaha for a long time. Relax. Yamaha makes a great stock muffler system so don't be shy about running it.  


Handlebar Set Up: I really tried hard to like the 2020 Yamaha YZ450F handlebar set up, but couldn't come to grips with the way the bar mounts forced my upper body through corners. It put me in a weird position when diving into ruts and it actually affected my corning speed. I went back to the rear hole with mounts forward and fell in love all over again. I am 6’0 and prefer the 2019 stock hole placement. I love the stock Yamaha bar bend and use that bar bend on almost all of my test bikes, but if you want a little more flex, go with a Pro Taper EVO SX RACE bar (same bend as the Yamaha stock bar). The stock Yamaha bar has a 5mm wall thickness and the Pro Taper EVO has a 4mm wall thickness, so you’ll get more flex. 

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Seat: If there is one problem area of the Yamaha it is the seat. The seat still breaks down quickly and can feel clapped out. This makes you feel like you're riding in the Yamaha and not on top. I am usually not a fan of taller seats, but Yamaha’s Accessory (GYTR) 20mm taller seat is actually pretty good. It puts you on top of the bike more and helped my sitting-to-standing transition out of corners. This helps you get off your ass out of the corner because the transition from sitting to standing is not as drastic. Soaking jumps up with your legs is always faster than seat bouncing. If you don’t go with the GYTR seat then go to gutsracing.com and get yourself a firmer or taller foam.


MX3S Front Tire: Yamaha will not want to hear this, but I feel the Yamaha corners better with a Dunlop MX3S front tire rather than the stock MX33. Yes, the MX3S is coming back and will be in stock in a couple weeks. If you’re having trouble with initial lean into corners, get yourself a Dunlop MX3S front and thank me later. 


Gearing: I tried a 13/50 gearing set up for all you novice riders, but it didn't work as good as the stock 13/49 set up. The stock gearing is just fine for 90% of tracks because the Yamaha’s engine has so much torque that it can pull third gear. Yes, even for you novice riders! Third gear is that “lugable” that you will not stall through corners, just make sure to cover the clutch lever. 

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Triple Clamps/Offset: The Yamaha YZ450F doesn't need aftermarket triple clamps nor does it need an offset change. The rigidity balance that the stock clamp has is a blend of comfort and performance that is hard to find with aftermarket clamps. Still having a hard time in corners? Don’t purchase clamps, simply go to a 102mm shock sag setting or go to a fork height of 7mm. I suggest trying one or the other, not both at the same time. This keeps balance as well as keep the superb bump absorption of the chassis/clamps. Some other machines accept aftermarket clamps better than others, but this Yamaha has the most comfort/performance with the stock clamp. Don’t go backwards on your set up by purchasing parts you don’t need!  

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Cycra Powerflow Shrouds: If you want the visual appeal of a thinner mid section you can go to Cycra Powerflow shrouds that are thinner at the top of the shrouds than the stock pieces. I like that the Cycra shrouds also feel slightly thinner when squeezing the Yamaha while I am standing.  

If you have any questions about the 2020 Yamaha YZ450F, please email me at kris@keeferinctesting.com and I hopefully can help you out.

2020 Yamaha YZ250F Baseline/Start Up Settings/Tips

The Yamaha YZ250F is un-changed for 2020 so this baseline set up article can be used for the 2019 YZ250F as well. The Yamaha is the easiest small bore four stroke motocross machine to ride with its torquey low end and improved top end pulling power that Yamaha came up with in 2019. For this test we focused on trying to keep the comfort that the Yamaha comes with, but also try to get the YZ250F to accept a rider that wants to push his limits on this bike. Below are some settings that we think may be able to help drop your lap times while keeping the Yamaha planted underneath you. 

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Suspension:  

The KYB/SSS/Yamaha suspension has the most comfort out of any bike in stock form, but if you want to start pushing the bike’s limits it can get soft and spongy feeling. After our initial test we took the 2020 Yamaha YZ250F to three vastly different types of tracks and noticed as the bike broke in all riders wanted more hold up from the suspension. We tried going to a heavier 4.8N/m fork spring (4.7N/m is stock) with the stock valving and to all three testers (160, 170, 190 pounds) liked the hold up and calmness that the stiffer spring came with. The heavier front spring helped the Yamaha’s chassis under heavy braking and each rider was able to push into rough corners harder without as much pitching. Settling into ruts was also easier because of the calm front fork feel. The rear of the bike can accept heavier riders better than the front so going to a stiffer rear spring for us wasn't warranted. What we really liked about this setting is that it didn't upset chassis balance and only improved the bike’s overall feel out on the track. Only a small increase of firmness was felt on the top of the fork’s stroke, but all riders agreed that the trade off was worth it. 


Fork: 

 Height: 5mm (Stock is 7mm)

Spring Rate: 4.8N/m (Stock is 4.7N/m)

Compression: 12 (Stock is 11 clicks out)

Rebound: 9-10 clicks out (Stock is 9 clicks out) 


*Optional Stock Spring Fork Setting*

Height: 4mm

Spring Rate: 4.7N/m

Compression: 8 clicks out

Rebound: 7 clicks out


Shock:

Sag: 105mm

Spring Rate: 55N/m

High Speed Compression: 1.25 Turn Out (1 Turn Out Is Stock)

Low Speed Compression: 8-9 clicks out (10 clicks out is stock)

Rebound: 9 clicks out (11 clicks out is stock)


ECU/Yamaha Power Tuner:

I really felt that the 2020 Yamaha YZ250F could benefit from a free-er engine feel on de-cel so I worked on a map to try and achieve this. This “Keefer Free Feeling” map gives you less pitching on de-cel coming into the corners and also made the Yamaha feel lighter through mid-corner, which helped keeping the lean through corners as well as change of direction. I felt like I could give up a small amount of torque to achieve this and that is what you will find when going to this map. You will get slightly less torque, keep that great mid-range pull as well as a slight increase in top end. If you want to also sacrifice a little torque feeling and increase the second and third gear pulling power (with the same amount of engine braking the stock map gives) go to the “Hard Hitting Map” Yamaha has pre-programmed on your Yamaha Power Tuner App. I use the “Hard Hitting” for my base map and the Free Feeling” map for my secondary map. Please don’t forget to update your apps on your phone as Yamaha does update their Power Tuner with new maps from time to time. 

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Chassis: 

Please for the love of all things holy DO NOT screw/change the engine mounts on this machine. I will say that some aftermarket engine mounts will help some other OEM’s frame feel for the better, but in the case of the Yamaha YZ250F, it really doesn't need aftermarket mounts. I have no problem pushing products that work, based on each individual machine, but that doesn't mean that specific part works for every single machine. Some machines could benefit with a softer/stiffer mount combo, but to me Yamaha did a great job of blending comfort with cornering stiffness for 95% of us “normal” folk. When trying some aftermarket engine mounts on the 2019 YZ250F it made the bike have less predictability when the track got rough. When smooth I could see some benefit on initial lean through corners (lighter feel), but when the track got hammered the Yamaha was tougher to get into the corner because the damping character of the chassis was harsher on de-cel bumps. Could you make aftermarket engine mounts work on this bike? I am sure you could with the help of some suspension tuning, but the purpose of this article is to get you increased comfort/more performance with less hassle and money. If we were talking 2018 Honda or 2019-2020 Suzuki, I would be steering you into the aftermarket engine mount direction, but we are talking bLU cRU here people! 

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Gearing:   

Two out of three test riders preferred the stock 13/50 gearing, but our slower heavier guy with less cornering technique liked going more the MXA (one tooth up) (13/51) route. Say what you want about going only “one tooth” up on a sprocket, but I can tell you that it does help on some machines with riders that have problems with using third gear in corners. The Yamaha has enough torque for intermediate type riders to use third gear in corners, but novices will appreciate a 13/51 ratio more to help them recover from mistakes. Going to this gearing will shorten the length of second and third gears, but it will allow you to short shift better and use the meat of the Yamaha’s power just like it was developed/intended. 


Seat: 

Do yourself a favor and get a 2020 YZ450F seat or a GUTS Racing firm seat foam. Yamaha changed the seat shape/stiffness in 2019, but still the middle of the seat can breakdown quickly and get soft. The fuel tank and subframes rails are not friendly when leaning on the edge of your seat or when you decide to seat bounce an obstacle out of a corner. 

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Rider Triangle:

Yamaha’s rider triangle can be cramped for some taller riders, but simply going to the forward bar mount hole (on the triple clamp) with mount faced back will get you 16mm’s of more room. The 2020 YZ450F comes like this stock, but you can do that slight tweak yourself and get more weight over the front end. I am 6’0 and prefer the rear hole with the mount forward, but I have heard more than one taller rider complain about being cramped on the Yamaha. I have yet to try moving the pegs down/back, but will look into this as an option for you taller riders.

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Maintenance: 

We have ridden the 2019 YZ250F a ton and although haven't had anything major go wrong with our YZ250F we did go through two stock batteries. Our YZ450F has never had a battery issue, but our YZ250F needed help in this area. We installed a FirePower battery in our test bike and had no other battery related issues. I also have received emails about timing chains going out and if we ran into this problem. The answer is no, but if you are a high revving, faster intermediate/pro type of rider, changing a timing chain every 20 hours is not uncommon. Follow your owners manual for regular scheduled maintenance, but just know that those maintenance schedules that Yamaha “suggests” aren't based on every type of rider. Each rider is different, but for the average rider/racer the Yamaha still has superb durability and is one of the few bikes that gives me less headaches during the course of the year. Please don’t believe everything you read on message boards and consider asking and trusting people and/or media outlets that spend a lot of time on these machines. I mean if I search up “headaches” on WebMD, I usually will read that I have some sort of Cancer and I should go to the hospital ASAP. Just because “Bobby Two Stroke” says Yamaha’s are ticking time bombs doesn’t mean they really are. Oh and you most likely DO NOT have Cancer, so everyone chill down. Sometimes message boards are a lot like WebMD, so proceed with some sort of caution. I am all not saying that a YZ250F’s will never blow up because they can just like any other machine. Take care of this bike and most likely it will take care of you.

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Throttle Play:

Check your YZ250F’s throttle play when you get it home. Most of the units I have seen have had a ton of free play in the throttle. The bad news is you are not able to adjust it all the way out with the top throttle cable adjusters. You will have to adjust the cables play on the throttle body in order to get most of it out. After adjusting the throttle play on the throttle body, proceed to adjust the top throttle cable adjusters to get the desired free play. Throttle play is a preference, but to me there is way too much throttle play, off the showroom floor, on the YZ250F. I have went to a couple dealerships and blipped throttles just to check and most had A LOT of play. Check your throttle free play!   

Wear Items:

I am not a huge fan of the stock grips on the YZ250F as they feel fat, the chain guide and slider are actually pretty damn good on the YZ250F compared to other Japanese machines, sprockets and chains are your average 10 hour change out items, I go through clutch plates every 10-12 hours and I am fairly abusive on clutches, the 2020 air filter seals better thanks in part to a rubber grommet in the middle of the filter, but leave the backfire screen in for added dirt/particle safety, and the Bridgestone X20’s provide a good amount of traction and lean angle grip, but when they wear down slightly they are very un-predictable under hard lean angle.

If you have any questions about the 2020 Yamaha YZ250F please feel free to ask away at kris@keeferinctesting.com. Hopefully we can give you an intelligent and enlightening answer, but if we don’t know the answer to your question, we simply will reply with an “I don’t know”. We don’t know everything.

2020 Yamaha YZ450F In Depth First Ride

For 2020, Yamaha is the only manufacturer to have any significant changes done to their 450cc motocross machine. With over 15 updated engine components, over 10 chassis components, and a suspension valving makeover Yamaha wasn't resting on their 2019 450 Shootout success. If there was one 2020 450 motocross bike that I was anxious to ride, this bike right here takes the cake. I was anxious to feel the changes Yamaha made out on the track, but also nervous because quite frankly I didn't want them to screw up an already great machine. In this “11 Things” I will break down all of the “feels” that I experienced while riding the 2020 Yamaha YZ450F. If you want to know more about the exact changes Yamaha made to the YZ450F, click here: https://www.keeferinctesting.com/latest-news-1/2019/6/4/yamaha-announces-full-lineup-of-2020nbspmotocross-bikes

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Engine: So what exactly are you getting with the 2020 Yamaha YZ450F engine? Compared to the 2019 you’re getting a more connected rear wheel feel out of corners and more RPM response. I don’t feel like you're necessarily getting more bottom end pulling power, but the initial crack of the throttle is improved (almost too much, but more on that in the ECU portion) right when you get ready to stab that throttle (anywhere in the RPM range). Where I felt most of the improvements were through mid range-top end pulling power. The difference in “meat” through the mid-range once out of corners is impressive. We talk about third gear a lot in these tests and how important that gear is to the rider. If third gear is not useable in corners, it’s tough to ride smooth and forces the rider to be more active on the bike, which could result in getting more tired more quickly. The Yamaha has more mid-range pulling power, which allows you to use third gear through corners even easier in 2020. Usually you will have to fan the clutch a little to get the engine to recover and get back into the upper RPM range, but with the 2020 YZ450F you can just roll on the throttle and it will start pulling you down the track immediately. Top end pulls farther in second and third gears for 2020 and will not sign off as much as the 2019 YZ450F does. Even though a 450 shouldn't be revved out, let’s be real, sometimes we are lazy and DO NOT have perfect riding technique, so it’s nice to leave it in second gear and use that gear all the way to the next corner. It happens right? This new engine character helps you do that better without sounding like Justin Barcia at Southwick. In a nutshell the 2020 engine in fact has more power with most of it being more controlled to the rear wheel. 

Engine Free Feeling: The improvements that the Yamaha made in this category warranted its own category. I mentioned to the R&D guys at Yamaha how much free-er second gear felt as the 2020 YZ450F didn't have near as much engine braking as the 2019 did. With the previous 2019 engine, the engine braking was apparent on grabby/heavy dirt, but with the 2020 engine refinements, second gear feels less tight and puts less force on the front wheel off-throttle. This helps the suspension settle coming into corners and that improvement alone helps the 2020 YZ450F corner better/more efficiently.

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Chassis: The 2020 YZ450F feels stiffer around the track. However don’t get scared off by the word “stiff”. It’s not rigid by any means, but just has a stiffer feel and not a wallowy sensation. Let’s go over this a little…The chassis is softer near the front of the machine and on the downtubes. The engine cradle tube thickness has been beefed up for increased rigidity as well as an engine mount material/shape change to help get this year’s YZ450F more planted. Now I am not going to sit here and tell you that this bike is a cornering dream and the changes that Yamaha made make this bike a class leading carver, but what it did gain is cornering stability as well as predictability through those corners. Gone is the hinged feeling near the rear of the bike when leaning under throttle through sweepers. The new Yamaha feels more planted under throttle while leaning through fast rougher corners (AKA sweepers). Straight line stability is still intact from 2019, but now has a slightly lighter initial lean in coming into tight corners. I didn't experience any added mid corner front end traction with the 2020 (maybe because of the MX33 front tire), but corner exits are improved as the 2020 YZ450F stayed leaned over easier at the end of corners. I do feel when the track gets rough the 2020 Yamaha is easier to push your limits, but just like with any performance gains you will lose a little comfort if riding around at 80% of your ability compared to the 2019. This new chassis will reward a rider that pushes harder and wants to go faster when the track gets rougher. Think GH @ 4:30.   

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Suspension: The stiffer setting that Yamaha went to amazingly still has more comfort than any other suspension out there for 2020. I mean I guess it shouldn't be a shock, but I am wired to think if I go stiffer, my comfort sensation on the track might go down. For 2020, the comfort that you've grown accustomed to with the KYB SSS/Yamaha suspension is still there! Even though both ends have more hold up and less pitching I still ended up going stiffer on my settings. I felt like under throttle out of corners the rear of the bike (shock) was too low and I was getting a harsh mid stroke feel. Going in one click stiffer on the low speed compression as well as in (stiffer) on the high speed compression a quarter turn will help with hold up. I also wanted to calm the rear of the bike down on braking bumps so I made a huge change to the rebound just to see how the YZ450F took it and to my surprise it really liked a slower shock setting, so don’t be scared to go as much as three clicks in (slower) on the rebound. Again, for 2020, Yamaha’s goal was to increase performance as well as comfort and they somehow weaved both seamlessly together for a no fuss suspension spec that I think will please a wide range of riders.   


Brakes: Remember the top 5 mods to the 2019 YZ450F article? One of those mods was installing a Brembo front brake system on the Yamaha. Just FYI, for 2020, I don’t think I will be going that direction. Yamaha went with a new caliper with an increased piston size, a more rigid caliper body, a larger surface area on the brake pads with a higher friction material, as well as a front disc that also has 16% more surface area. The new Nissin front brake is not as strong as a Brembo, but it’s much more powerful than the 2019 system by far. The somewhat mushy front brake lever feel is now gone and now you will be getting more power at the lever. I didn't have to pull the front brake lever in nearly as far as the 2019 lever, so make sure to prepare yourself before grabbing a finger full. On more than one occasion I grabbed too much lever and almost washed the front end out because it can be a little touchier than last year’s front brake. If you feel like it may be too touchy simply adjust it in towards the throttle and this helps tremendously. It’s nice to have a strong front brake to the Yamaha as it makes charging into corners that much easier. I also approve of the new 240mm rear disc size (from 245mm in 2019) for 2020. Kawasaki has a 250mm rear disc, but it’s so grabby that your braking points coming into corners gets all screwed up. No one needs 250mm of rear disc. Bigger is not ALWAYS better and in this case the smaller diameter rear disc is easier to modulate your braking. 

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Rider Triangle: Simply put, I don’t like the changes Yamaha made to the 2020 handlebar position. I do like the 5mm lower mounts (2017 mount height), but the 16.5mm forward position in 2020 is just too much for my 6’0 frame. Yamaha wanted to get the rider to more forward on the bike for 2020 and although they achieved that, my riding position/technique suffered. I had more leverage on the bike when I was in the 2019 position and could feel the front tire more when leaning. With the 2020 position I couldn't get enough leverage down on the front end to push the front end down when I needed to. The 2020 position bent my elbows too much when sitting and caused my arms to be less relaxed, which forced me to have the wrong grip with my hands on the bars. Putting the mounts back to the original rear hole/forward mount position let me corner better and gain more control over the Yamaha. I will say when standing the 2020 setting of the forward hole/rear facing mount was more comfortable because it put my upper body in more relaxed position. Find out what works best for you and what area of the track is most important to your technique (for you to be the most comfortable and stick with that setting). 

20mm Taller Seat: Matthes and I tried an optional 20mm taller seat and I actually liked it. I am usually not a taller seat kind of guy, but I liked that there wasn't as much of a pocket as the stock foam shape. With the 20mm taller seat you obviously sit more on top of the YZ450F instead of inside it and to me that helped with the transition from sitting to standing. I think of David Vuillemin every time I seat bounce a jump and it pisses me off. In that case I might invest in one of these suckers to try out, so he stops yelling at me inside of my head while riding. Yamaha Accessories Division will be offering this optional seat to purchase. 


ECU Settings/Engine Maps: The new on-the-fly handlebar mounted map button on the 2020 YZ450F is a welcome addition. I thought the added RPM response down low of the stock/standard map was too touchy for me through corners. I liked the “stock” map for longer/faster/softer tracks, but for everything else I used the TP 3.0 map, Keefer 1, and Exciting Power Character (all attached) maps the most. The TP 3.0 builds more RPM’s a little smoother/slower, but is super connected and the most easiest to ride. The “Keefer 1” map has a little more RPM hit initially, but still uses that smoothness of the TP 3.0 pulling out of corners. Finally, the “Exciting Power Character” uses that smooth roll on of the TP 3.0 down low, but has more RPM excitement through the mid range power. I thought the 2020 YZ450F’s chassis performed the best with the TP 3.0 as it didn't upset the YZ450F chassis as much rolling through mid corner. Try these and let us know what you think! 

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Dunlop MX33 Tires: I immediately went home and put one of my trusty Dunlop MX3S front tires on this bike to see if it improves cornering! WOW! Even thought Dunlop doesn't make this front tire now, I still feel like the 3S helps the Yamaha’s initial lean and turn in. The 3S makes the Yamaha easier to cut underneath a blown out rut and has a more comfortable carcass feel on bumps. The 33 front tire is better than the 3S later in the corner, but to me I really need that initial lean in feel to help predict my corner. If you’re a front end steering rider you may not like this front tire feel as it may feel vague/pushy, but don’t blame it on the YZ450F yet. Scour the earth for a Dunlop MX3S (there still out there somewhere) or try a Pirelli MX32 if you want some better lean in angle traction. 


Setting Up In The Air While Starting A Lean Angle: I found that one area that the YZ450F is weak is when you’re setting up in the air, to get on the throttle to start a lean, the YZ450F feels heavy/vague once the suspension loads/unloads. Unlike a KTM or Husqvarna where they feel planted when landing off a jump while leaning, under that lean angle the Yamaha takes longer to regain a full traction/planted feel. I am able to continue my lean angle that I started in the air, land that way, and get on the gas immediately with the KTM/Husqvarna. This is something that may not be felt by most of you without riding other bikes back to back, but it’s something that I noticed almost immediately when riding the same track with a few different bikes. 

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2019 VS. 2020: I feel that going from a 2019 to a 2020 YZ450F is a more noticeable difference for the better than going from a 2017-2018 YZ450F. Most of the changes that Yamaha made to the 2020 YZ450F are for the better and will help a wide range of riders become faster as well as give the rider a more predictable feel around the track. I always get the question “Is it worth it for me to get a 2020 over a 2019”? My answer to you is “yes, it’s worth it this year”. If the difference is a couple grand and you’re able to get the wife to sign off on it, then go with the 2020 because there is a lot of noticeable positive differences that will increase your fun factor when moto'ing. 

To get more settings info and more in depth talk about the 2020 Yamaha YZ450F listen to the Rocky Mountain ATV/MC Keefer Tested Podcast and/or Pulp MX’s podcast with Ryan Lockhart. 




























2020 Yamaha YZ250F On-Track Facts And Figures

Yamaha didn't change the YZ250F very much for 2020, but we did manage to get some added on-track information on Yamaha’s latest YZ250F and get you some feedback just in case you missed it in 2019. Below are some notes that should be taken into consideration about the changes Yamaha’s did make in 2019 and how the new 2020 YZ250F rides on the track. We will also lightly compare how the 2020 compares to the older 2018 model just in case you’re coming off of an older Yamaha YZ250F for comparison sakes.  

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Also, just in case you missed the bold italics above, we say “very much” because some other media outlets are saying that NOTHING has changed with the 2020 YZ250F, but there is one small change and that may have been over looked. The filter element now has a rubber grommet to keep the element in place under the harmonics of the motorcycle while running. The 2019 filter element didn't seal that well, but with the updated grommet the 2020 seals much better. It’s not much, but it’s an important piece to a problem that the 2019 Yamaha had. 

2020 Filter Element

2020 Filter Element

2019 Changes:

Yamaha kept the reward slanting engine design (for 2019 the engine is slanted forward 1 degree from the 2018) that already worked so well on the last model and made some changes to make it even better. Starting by adding electric start, Yamaha is the second Japanese manufacturer to have an e-start 250F motocross bike. The exhaust port shape was slightly modified so it transitions to the head pipe (which shape has also been changed to accommodate this) better and has increased the flow rate. Also in the head, Yamaha has increased the intake valve lift, and slightly changed the angle of the exhaust cam. The final changes to the new head are larger lifter buckets and slightly stiffer valve springs. Underneath the head, the piston crown has been increased, which has bumped the compression from 13.5:1 to 13.8:1.


 The throttle body on the 2019 changed from Keihin to Mikuni. It is 44mm and has a 12 hole injector. Also different on the throttle body is the cold start (choke) which now has to be pushed in to be activated and is deactivated by fully closing the throttle. Along with the engine changes and new fuel system, the ECU settings have been updated. The new dual electrode spark plug’s cap now has a finger holder keeping the cap firmly in place. The transmission side of the engine has also received key changes including a heavier duty clutch. What makes the clutch stronger is larger plate diameter, 6 clutch springs (one more than last year), and thicker steel plates (which in turn reduced the number of friction plates from 9 to 8). The transmission gears have also been updated and are using a high impact steel.

The new e-start is a compact, sits behind the cylinder, and drives the clutch basket directly. The 1.5 pound lithium battery sits under the rear of the seat and has a capacity of 2.4AH and 13.2volts. The amount of power the YZ 250F needs to generate has been reduced because of the addition of the battery which means there is less resistance on the stator/engine.


The frame on the 2019 has been majorly changed to make the bike feel more nimble on the track. The frame rails that go around the gas tank/air box are now straight where last year had more of an S shape. Other parts of the frame have been changed from forged pieces to extrusion aluminum, and the engine mounts have been changed from steel to aluminum. The material at the swingarm mount have been increased front to back and narrowed side to side, making the side of the frame flatter at the swing arm mount. The steering head has also been moved forward 6mm to help with stability.


In the past there have been comments about the seat height and width of the YZ 250F. Yamaha has changed that by making the seat slightly flatter, shorter, and narrower than last year’s model. Along with the seat, Yamaha has narrowed up the plastic where the rider’s knees contact the shrouds. The new shrouds have the air ducts integrated into them (same as 450) and the whole top part of the shroud no longer has to be removed to service the air filter. The air filter cover now only needs one Dzus fastener to be removed for access to the air filter which is no longer held in by a screw, instead it’s held in via rotating clips.


Yamaha tried to lighten the bike in 2019 up by using thinner, higher strength material for the handlebars, and also using lighter rims. To help with stability, they increased the surface area of the wheel collars where they contact the fork lugs and added more material to the rear collars. The KYB forks use new internals including a new piston, cylinder, mid speed valve, pressure piston, and stiffer spring rates (from 4.6N/mm to 4.7N/mm). The shock reservoir volume has been increased by 30cc and the coil spring now has less winds, is made of a thinner material (lighter), and the rate has changed from 54N/mm to 56N/mm.


On The Track With The 2020 YZ250F:


The 2020 YZ250F has great torque and pulling power down low, but doesn't quite have the top end pulling power like other bikes in its class. The YZ250F is so good at low rpm that it gives me the sensation that I want to ride a 250F full time. It’s that much fun! The Yamaha pulls hard out of corners and has a huge amount of bottom to mid range response that most will appreciate. There is enough meat coming out of corners that a wide range of riders as well as abilities can be left with the decision to leave it in second or third gear through corners. It’s a very vet rider friendly machine and gives the rider that excitement that we all look for in a bike. What is the downside? It does have more engine braking than the KX or CRF and I would like more top end pulling power through second and third gear. We worked on a different map to increase top end and also decrease engine braking. More on that below. 

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 The firm feel of the 2020 chassis makes the bike feel planted and have a positive front end feeling through corners. Where the 2018 kind of felt lethargic/slow to react to the rider, the 2020 feels slimmer and more nimble (from the swingarm pivot forward) yet has a better straight line character on fast choppy tracks. The easiest way to describe the way the 2020 feels is that it has a fun cornering character with a confidence inspiring straight line feel. The 2020 YZ250F isn’t the leader of getting in and out of corners the quickest, but the planted feel in which it comes with is calming to any rider. The chassis still has a pitching (off throttle) sensation, but with a small change to the ECU, this pitching feel can diminish. The beauty is that if you want engine braking with a heavier front end feel, the Yamaha can give you that or if you want a lighter front end feel with a less heavier front end feel, simply going to the “Keefer Free Feeling Map” can give you that as well. Again, to me, this is a very well rounded chassis for a wide range of riders and abilities.  

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 The 2020 KYB SSS fork is still the best fork out on the market. With the chassis changes Yamaha made in 2019, the KYB fork compliments those changes wonderfully. The fork does not dive as much on de-cel and stays up in the stroke more (especially with the KK map installed) than the 2018. The KYB fork does move in the stroke, but going 1-2 clicks slower on the rebound helped calm the front end down on g-outs or jump faces. Our lightest test rider liked he stock rebound setting on the fork, but if you’re slightly heavier going slower will be the better way to go. The shock likes to be set to around 104-105mm and it complimented all three riders that we used in this test. We set the baseline sag of 105mm to our middle weighted rider (170 pounds) and the other two riders (150 pounds and 195 pounds) thought the bike was balanced enough for them to push around the track. Traction to the rear wheel is apparent on the Yamaha when giving it the berries out of corners and it’s really difficult for the rear tire to step out coming out from a rut. On de-cel the rear of the 2020 Yamaha doesn’t have a vague light feel, which sometimes could leave you with that rear end “sliding out feel” and then that “oh shit” sensation like the 2018 version had. The rear end of the 2020 YZ250F feels heavier/planted (in a good way), which gave me the sensation of a more connected throttle to rear wheel feel (AKA, meaning a more planted/heavier feel).

 Stop with the Yamaha feels fat excuse. Every time I hear this I tell people “go measure your KTM and measure the Yamaha (at the shrouds) and get back to me”. Sitting on the 2020 YZ250F feels just fine because I feel more upright than “inside” the machine. The whole machine feels slimmer and flatter than the 2018, which to me will fit larger sized riders just fine. You will have to go with a stiffer foam after 10 hours or so, but that is an easy fix by calling Guts Racing. You can also go with the bar mount in the forward hole turned back if you need a little more cockpit room. I have tried this position and have come to like this rider triangle feel. The 2020 Yamaha YZ450F will come standard with this position, so I better get used to it.    


I really felt that the 2020 Yamaha YZ250F could benefit from a free-er engine feel on de-cel so I worked on a map to try and achieve this. This “Keefer Free Feeling” map below gives you less pitching on de-cel coming into the corners and also made the Yamaha feel lighter through mid-corner, which helped cornering as well as change of direction. I felt like I could give up a little amount of torque that the Yamaha has to achieve this and that is what you will find when going to this map. You will get slightly less torque, keep that great mid-range pull as well as slightly increase top end. If you want to also sacrifice a little torque feeling and increase the second and third gear pulling power (with the same amount of engine braking the stock map gives) go to the “Hard Hitting Map” Yamaha has pre-programmed on your Yamaha Power Tuner App. I use the “Hard Hitting” for my base map and the Free Feeling” map for my secondary map. 

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Bridgestone X20’s come standard on the 2020 Yamaha YZ250F and although I didn't like them on the YZ450F when I tried them they work well on the YZ250F, especially on front tire lean angle. I like that you can initiate your lean early on the font tire of the X20 and it will give you a positive feeling underneath you. The rear tire isn't quite as good on lean angle, but still hooks up in a wide range of conditions. I will say that the X20 has a better carcass feel than that of the Dunlop MX33 tires. I will take a Bridgestone X20 front tire all day over a MX33.  

Stay tuned for a settings article over on keeferinctesting.com as well as pulpmx.com for the 2020 YZ250F as soon as we got more time on the bLU cRU machine.

Top 5 Mods For The 2019 Yamaha YZ450F

Not everyone wants to “add” parts to their new dirt bikes, which is fine, but for those that must tinker, we put together a “Top 5” must haves that we would recommend. We will be doing these “Top 5” articles with all of the new 450F/250F machines and will be splitting the information up between pulpmx.com and keeferinctesting.com. These mods are recommended, by us, through countless hours of testing. If you don’t find a specific aftermarket company that you prefer in this article, don't fret, email me at kris@keeferinctesting.com and we can talk it out like adults should. Again, we will not push something on you unless we know it works. These mods that are in this article simply work for this specific machine. 

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1. Fire Power Battery: The stock Yamaha YZ450F battery is a problem. It doesn't like to start in gear and if you do try to start it in gear for too long the battery will drain quickly. I have had countless emails sent to me about Yamaha batteries and the only thing I can tell you guys is go with an aftermarket lithium ion battery. I have been using Fire Power batteries in my Yamaha’s and they all have been great. Not to mention that they are lighter than stock, so losing some weight doesn't hurt. For around $125.00, it’s a fairly inexpensive way to prevent you from being stranded at the moto track with a dead battery. 

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2. GUTS RACING Stiff Seat Foam And Gripper Seat Cover: Yes, we know Yamaha made some stiffer changes to the foam for 2019, but once the foam breaks down a little we are back in 2018 all over again and hitting the fuel tank when slamming into ruts. Going to a GUTS stiffer foam does wonders from smacking your butt bone into the fuel cell that lies underneath you. Does be scared off by the word “stiff” as the GUTS foam is stiffer, but not so bad where you will be getting monkey butt. I go with the standard stiff foam and not the phantom foam as I like the feel of the standard stiff foam more. While you’re at it go with a gripper seat cover and prevent your rear end from sliding under acceleration. The stock Yamaha seat is slippery after about 20 hours and will not hold you in place from that explosive Yamaha 450 power.  

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3. Heavy Duty Chain: Like most stock chains the Yamaha chain will stretch and be smoked before the 8 hour mark, so get a good high quality heavy duty D.I.D. 520 ERT2 Gold chain. If you don’t mind the weight and the drag of an o-ring chain that is also a great choice. 

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4. FMF 4.1 Full Muffler System: I am not going to sit here and tell you that you NEED an aftermarket muffler for the 2019 YZ450F, because you don’t. The stock muffler is so good on this bike that it’s not something you will need right away. However, I know most of you have A.D.D. when it comes to putting shit on your bike, so I will recommend a muffler that I had some help in testing recently. I helped George at FMF come up with a different setting inside the muffler (or core) of this system to create some more back pressure, in order to keep the bottom end that the stock system has. The FMF 4.1 system knocks off almost two full pounds of weight, retains the stock bottom end power, increases the mid range and top end, and will only lose minimal over-rev. I have tried a ton of aftermarket mufflers for the YZ450F and all of them lose bottom end. Not this one…  

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5. Front Brake: The Yamaha front brake is not the best of the bunch when it comes to stopping power, but there is a modification you can do to make it insanely good (besides just throwing an oversize rotor on). If you want increased stopping power without the grabby feel, purchase an older Yamaha caliper (that used a bigger piston/part number shown) and an older KTM Brembo master cylinder (part number shown) while using your current 2019 YZ450F brake line and feel the magic coming into corners. You will be able to brake later and modulate the front brake better in shallow ruts than you can with the current front brake. This set up is also much more linear and less grabby than just throwing on an oversize front rotor as well. Just make sure to purchase the stock KTM banjo bolts and use your current 2019 YZ450F front brake carrier along with the current brake pad clip..  















Top 5 Mods For The 2019 Yamaha YZ450FX

Not everyone wants to “add” parts to their new dirt bikes, which is fine, but for those that must tinker, we put together a “Top 5” must haves that we would recommend. We will be doing these “Top 5” articles with all of the new 450F/250F’s (along with a couple off-road machines) and will be splitting the information up between pulpmx.com and keeferinctesting.com. These mods are recommended, by us, through countless hours of testing. If you don’t find a specific aftermarket company that you prefer in this article, don't fret, email me at kris@keeferinctesting.com and we can talk it out like adults should. Again, we will not push something on you unless we know it works. These mods that are in this article simply work for this specific machine. 

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1. FMF 4.1 Slip On Muffler 

It’s no secret that the 2019 Yamaha 450FX is a great off-road competition bike, but to some it may be a surprise that in stock form it’s not legal to race at the majority of off-road races. The one thing that holds the FX back from being off-road race friendly is the lack of a spark arrestor, which 99% of off-road race organizations require in order to racer on public or even private lands.  We opted to go with an FMF slip on muffler which comes with a spark arrestor (in the box, not installed in the muffler) which gave the FX a slightly louder tone and got rid of the slightly raspy stock sounding muffler. With the spark arrestor removed the engine lost a little bottom end roll on power, but gained some over rev. With the spark arrestor insert installed, the muffler mimicked the stock characteristics and gained some mid-range. https://www.fmfracing.com/Product/ProductDetail?CategoryID=584&BikeType=MX%2FOFFROAD&BikeMake=YAMAHA&BikeModel=YZ450FX&BikeYear=2019&ItemID=044443&imaConfig=Single&ParentCategoryID=31&Priority=9 

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2. Yamaha Power Tuner App

Yamaha is the first manufacturer to offer a phone app to map your motorcycle and it’s awesome! The app is very user friendly and gives you the ability to use Yamaha’s provided apps, as well as being able to make your own. Yamaha provides four maps; Mild Power, MX Power Feeling, High Revving, and Torquey. Two maps are able to load in the bike at one time and I have found myself trail riding with my phone as well as trying other maps when we come to a stop. The maps can be toggled between the handlebar mounted map switch and I have found it very handy depending on the terrain changes. https://www.yamahamotorsports.com/motocross/pages/yamaha-power-tuner-smart-phone-app 

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3. Firepower Battery 

The newest generation Yamahas are very hard to start in gear, and even when in neutral they tend to turn over for longer than desired. I have found that different maps also effect how quickly the bike will fire up. So far, I have killed two batteries in the 450FX just from trail riding and constantly stopping and starting over the course of several hours. Luckily, I was able to bump start the bike both times but after the second dead stock battery I knew it was time for an upgrade. The Firepower battery was slightly lighter than the stock and has yet to leave me stranded. That being said it still doesn’t like to be started in gear.  https://www.firepowerparts.com/products/batteries    

4. Handguards

I’ve said it before and ill say it again, if a bike is designed to be an off-road bike it should come with handguards. The FX comes with a bitchin skid plate, but they decided not to add handguards on the production bike. Although for the bike’s introduction, Yamaha added GYTR flag handguards, which have been on the bike ever since. It all depends on what type of riding or racing you do, some people swear by flag style mounts, and others will not ride without full wraps, but either way, do yourself a favor and put on some type of hand protection. https://www.shopyamaha.com/product/details/cycra-rebound-hand-shields?b=Motocross+Accessories&d=42|42&ls=yamaha-motor-company&dealernumber= 

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5. Fork Springs

Although the 2019 FX has much better hold up than the previous generation, the fork still has a slight diving sensation when chopping the throttle or under heavy braking. This can be somewhat fixed with clickers if you aren’t too heavy, but on my 190 pound ass (give me a break my wife is pregnant), stiffer springs will do the trick. Race Tech recommends going from the stock .46 kg/mm to a .50 kg/mm to fix the issue. I have also heard of people putting the springs from the moto bike (.51 kg/mm) and having good results. Either way, a little more hold up goes a long way when your riding gets faster and more aggressive. http://racetech.com/ChooseVehicle.aspx 

2019 Yamaha WR450F First Impression

Written By: Michael Allen

I’m sure there are a lot of people who come to the Keefer Inc. website that don’t really care about off-road bikes, but then there are my people; the ones who not only love off-road, but just motorcycles in general. Like I said, I love off-road bikes, so when Yamaha asked us if we wanted to try the 2019 WR450F, I was all about it. In the past it usually takes manufacturers up to three years to move the changes they’ve made to their motocross bikes over to the off-road line, but for this model, it has taken just under two years. The 2019 WR 450F is all new from the frame to the engine and even down to the headlight, in which Yamaha has made big changes. 

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The WR has an all new engine with a more compact electric starter that is mounted behind the cylinder and drives the clutch basket. This starter also has a heat shield on top of it to protect it from the head pipe. The engine shares a lot of parts with the YZ450F, but some parts are specific to the WR like the clutch plates, and magneto rotor. The different clutch plates help provide a lighter clutch feel as well as better clutch modulation. The wide ratio 5-speed transmission spreads the power out over a much wider range than the YZ450F and it was explained to us this way.. The gears on the WR are spread as follows: First gear is like adding fourteen teeth to the rear sprocket of the motocross bike Second gear is like adding eight, third gear is like adding two teeth, fourth gear is the same as the motocross version, and fifth gear is like removing four teeth, which almost acts like an overdrive. The other main change to the 2019 WR450F is the chassis, which has a rigidity increase of 25% vertically 9% horizontally and 15% torsionally. Don’t let those numbers scare you into thinking this bike is going to be too stiff because Yamaha went to work in other places to give it a better overall balance (while retaining comfort) than the 2018 version. Along with the new chassis, the 2019 WR has slimmer bodywork that make the shrouds 16mm narrower, really helping minimize the “bulky” feeling that some people associate with the Yamaha. The new headlight is tucked closer to the head tube as well as being lower, which helps keep the weight closer to the center of the bike. Another cool feature the WR has is a digital trip meter/speedometer which is adjustable so it can be used for enduros or rally events. Finally Yamaha has gone away from their old cable drive for the trip meter and entered the 21st century using a magnetic pickup. The wire for the pickup is cleanly routed behind the left fork guard and is completely protected from off-road elements. The 2019 comes with a fan, which in my opinion is a necessity for hard core off road bikes. The fan does seem to run for a long time once stopped on the trail, but I was never left stranded with a dead battery over the course of our test. The fuel tank is slightly larger on the 2019 at 2.16 gallons which was achieved by using a more compact fuel pump that allows for more fuel volume. The stock skid plate is very cleanly mounted and offers more protection up the water pump than the 2018 model. Although Yamaha put GYTR handguards on the bikes for us on the intro day, the bike does NOT come with them, which in my opinion is a bummer because after all it is an off-road bike.

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Now that you know all the changes to the 2019 WR, here is how it works in the real world. To start, the bike comes from the dealership slightly more corked up than the form we rode the bike in. We were told that the way the WR50F comes is a Japanese  standard practice and removing the items that we took off did not change the bikes legality in any state (even California). Unfortunately for this year the WR is not a green sticker bike in California and is stuck being a red sticker for the time being because of some new California regulations (thanks California). Back to the un-corking we did; the stock intake comes with a snorkel under the backfire screen, feel free to remove it and you’re 1/3 of the way to making the WR rideable. Next remove the throttle stop screw to get the full range of throttle opening and finally take out the ridiculously small pee hole cork in the muffler to help the bike breathe. Like I said, this opens the bike up while still keeping it legal to ride on the trails, but at the same time doesn’t un-cork the bike and make it loud and raspy. With the bike ready to ride, it’s still remarkably quiet and to be honest I had my doubts about how good it could be because it was so quiet. 

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The 2019 doesn’t come with a kick starter and in fact doesn’t even have the hole in the side case to be able to put one on. This may worry some old school people, but in all my years of testing electric start dirt bikes I have never been stranded by one on the trail. If the bike is in neutral, the clutch doesn’t need to be engaged to start the engine, but if the bike is in gear, the clutch does need to be pulled in to get the starter to turn over the engine. This can be over ridden by cutting the wires that goes to the clutch switch and soldering them together (but you didn’t hear that from us). One thing that we did discover that seems to be an issue with all of the current Yamaha models is that they don’t like to be started while in gear. For some reason the extra drag of the clutch is slightly too much for the engine to turn over and actually fire, so we found ourselves having to put the bike in neutral most of the time to get it started. 

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The engine on the 2019 WR450F is greatly improved over the 2018 with a much more free revving feeling, which no longer makes the engine feel heavy slow revving. Yamaha told us they still wanted the WR to have a trail bike feel without having it feel like and old Honda XR. In my opinion Yamaha did a great job blurring the line between total trail bike and off-road race bike. With the new slightly more powerful engine, the 2019 WR has a more playful power characteristic, which makes the whole bike feel lighter and nimble. The corked-up sounding muffler didn’t hamper power nearly as badly as I had imagined. In fact after talking with Keefer we both agreed that the lack of “sound” never hampered the bike’s power delivery all day. Not once were we unable to ride over an obstacle or complete a hill climb due to a hiccup or lack of power. In fact we rode some very long sandy hill climbs and were able to clean them every time all while hardly making any noise. I think the new engine will give the WR the ability to be raced (even in stock form) without feeling like the bike is at a disadvantage. We were told that this is the closest that the WR has ever been in relation to the YZ 450F model and when on the trail it’s pretty clear that the WR has the ability to be pushed whenever you want to pick up the pace.

The increased rigidity on the 2019 was immediately felt on the trail, but not necessarily in a bad way. Although the stiffer chassis does result in a slightly less comfortable ride at slow speeds over small chop/rocks it gains in agility on tighter trails. The chassis no longer feels lethargic and lazy when trying to make quick direction changes, instead it reacts quickly with minimal input from the rider. Just the slightest weight transfer to the footpegs and the WR reacts with confidence without feeling too twitchy. I think that the change to the engine really works in unison with the new chassis, to make the bike feel more exciting and more like a competition bike. With that being said the WR still acts like a trail bike, but it just seems to me like Yamaha has moved the WR slightly closer to the FX model than it has ever been. One place where I felt the 2018 was slightly better than the 2019 was straight line stability on very fast/loose rock jeep trails. With weight comes stability and the lighter feeling 2019 WR450F does feel slightly looser feeling at speeds than the previous model. For my personal taste I would take a better handling bike over one that just goes in a straight line well. 

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Yamaha never tried to chase the dragon when all the other manufacturers were on the air fork train. Not going down the air fork road only helped Yamaha because they never stopped developing their KYB SSS fork, which in my opinion is the best OEM fork on the market.  Recently other manufacturers have been bragging about how their suspension is basically an “A-Kit”, but the SSS suspension is outperforming their so called “A-Kit” set ups. Yamaha seems to rely on the performance of their fork and knowing that giving it a cool title doesn’t make it perform any better. We like that! The fork on the WR comes with a 4.6 N/mm spring while the shock come with a 56 N/mm, which are both slightly stiffer than the 2018 WR, but lighter than the 2019 YZ 450F. The fork and shock on the 2019 WR450F work perfectly in unison unlike the 2018 model which has a front heavy pitching sensation when getting off the throttle as well as using the front brake. The balance front to back is much better (on the 2019) and the suspension settings have a much better balance. The range of terrain the 2019 WR450F can handle is much wider than the 2018 and that gives the consumer the option to open up a wide variety of trail options, without having to compensate for the 2018 shortcomings. The new WR can be pushed with more confidence at a faster pace without blowing through the stroke and gives the rider more comfort.  

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I think that overall it’s safe to say that Yamaha has made a much better WR that has done a great job of blending a trail bike and race bike. I feel like if you wanted to buy a Yamaha to race closed course events then go trail ride with your buddies you were pigeon held to buy the FX in 2018, but now for 2019 I feel like the WR has taken that place. If you ride trails the majority of the time and occasionally race, the WR is truly a viable choice now. As European manufacturers step up their game, I thinks it’s really cool to see Yamaha answer with improved off-road bikes. Yamaha is waking up and realizing that they can make a bike that can be a trail bike without being too soft and lazy feeling. Instead Yamaha has made a comfortable trail bike that can be ridden at a race pace if you feel like stepping up your riding game. It has been apparent over the past few years that most trails and starting lines have turned orange-ish in color, but after riding Yamaha’s latest offering, a sea of blue may dim the orange fires. If you have any questions about the 2019 Yamaha WR450F feel free to reach out to me at Michael@keeferinctesting.com








Living With The 2019 Yamaha YZ450FX By Michael Allen

It’s now been over three months since I took possession of the 2019 Yamaha YZ 450FX and I’ve been able to ride it in many different conditions. Mostly it has been used as my trail bike in the Southern California desert and mountains, but I have also raced it at a local District 37 Sprint Enduro more recently. Luckily, we’ve had a wet winter down here, so needless to say there’s nothing much better than wet dirt and an off-road 450. Overall the FX has been a fun bike to ride and has proved itself quite versatile in different terrains and scenarios. Here are some of the experiences I have had with the 2019 Yamaha YZ450FX. 

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Being that the FX is designed as a “closed course” off-road race bike it’s naturally made to be more aggressive than the WR trail bike which has a VERY soft and mild mannered engine character. Although the FX is more moto related than a trail bike, that doesn’t mean that it can’t be tamed down, tailored to the rider’s skill level, and preference of riding. Yamaha now offers their power tuner app for any smart phone, which gives you the ability to load pre-set maps into the bike as well as giving you the ability to tailor your own maps. One thing that I am often asked is if the YZ450F maps will work in the FX and sadly the answer is “no”. That being said, there are plenty of FX maps out there to make your FX more aggressive and feel like a moto bike (see images for maps). Only two maps can be downloaded to the bike at one time and can be switched between the two on the fly. Personally, the two maps I like to have in the bike are “mild power” and “MX power feeling”, this gives me the ability to tackle different types of terrain and have a map that works fairly well in either faster or slower conditions. The mild power map richens up the bottom end and really helps the bike in tighter conditions where a lot of 450s are prone to flaming out. Although the mild map is really good, when riding a gear high in slow conditions the FX still benefits from having the rider cover the clutch just to make sure stalls are kept at bay. The more aggressive maps for the FX really make the bike feel just a touch off from the YZ450F with a very hard and aggressive hitting power that is great in faster, sandier conditions when you want the most power available. Having the app on your phone is genius and I would bet the other manufacturers will follow suite in coming years. I almost always have my phone on me when riding trails, so it’s really convenient to be able to try a different map when taking a trailside break (the app doesn’t need mobile service to change maps as long as you have them loaded on your phone).  

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Over time (20 hours) the YZ450FX’s suspension oil/bushings had slightly broken down, which has made the damping feel a little softer than when the bike was new. I think for my weight (180 pounds) the spring rates are slightly soft when riding at a race pace (A Level), but at a trail pace the suspension settings are quite comfortable. The main places that the suspension is soft is when riding aggressively through large whoops and g-outs. The feeling I get (in those conditions) is a sensation of the fork and shock blowing through and riding slightly too low in the stroke. At the District 37 Sprint Enduro I had to check up more than I would like for g-outs because the fork and shock would bottom and it would make my feet/pegs hit the rocks in the bottom of g-outs. Stiffening up the compression on both ends of the suspension helped hold up and only minimally effected small bump absorption. This newer model FX is a better cornering bike than the previous generation by having the ability to change direction with less rider input. It may be partially in my head due to the slimmer feeling bodywork, but the newer model also feels slightly less top heavy and overall more nimble. The engine braking is much more friendlier in 2019 and ride attitude on/off throttle is much better. NOTE: Using the “MX Power Feeling” map creates less engine braking than the other maps.

The FX’s engine (in stock form) is very capable and doesn’t need much of anything to be really competitive in a race situation. The only aftermarket piece we have added to the FX is an FMF 4.1 slip-on, which was mostly needed to make the bike legal for off-road racing, since the FMF comes with a spark arrestor. The FMF took away the somewhat raspy sound that the stock muffler puts out and replaced it with a deeper tone that was slightly louder. The FMF system also helped mid range power, but slightly smoothed out the bottom end. I didn't mind the newfound delivery as the race was super technical and rocky, so having that smoother RPM response was fine for me. We will have more on the FMF 4.1 slip on system for the 2019 YZ450FX in another separate article. 

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In terms of durability, I have only had two issues….. One is that the 2019 FX does NOT like to start when in gear. This doesn’t sound like that big a deal, but when it comes to races with dead engine starts this can become an issue. Also, when out on a long trail ride, in more extreme terrain, I had the battery die on me from starting and stopping frequently. With no kick start back up, I was lucky enough to be on a hill and could bump start the bike fairly easy. Once down the trail and riding a few miles, the battery would generate enough voltage to start the FX (although turning over slowly), but once the bike sat in the garage for a week, the battery lost all voltage and had to be replaced. The only other issue that I had was a blown fork seal on the caliper side. After talking with Travis Preston from Yamaha, he said that there were no nicks on the fork tube, but it could have been that the forks twisted in a small crash (I may have had a few of those) and upon compressing the front suspension, with misaligned forks, it damaged the seals. So if you ever have a crash that twists your handlebars, make sure to loosen the front end (fork pinch bolts, axle nut, etc.) completely before going back on your next ride. 

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It’s no shocker that Yamaha built a great machine and I think we can all agree it’s a good thing that it’s not just the Europeans building great off-road/hybrid machines. In the future I’d like to race the FX at a few more local races and possibly try some stiffer spring rates, give you guys some added suspension specs, and work on even better maps for technical riding. After all, I need to do something to get better than a third place in the vet class (Kris says that’s not acceptable). Keep an eye out for a review on the FMF 4.1 muffler in the coming weeks over at Keeferinctesting.com and feel free to reach out to me at Michael@keeferinctesting.com if you have any questions about the 2019 Yamaha YZ 450FX.