Race Settings

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