Weekend Race Set Up: 2022 Dubya USA World Vet Glen Helen Spec

Kris Keefer

Track: Glen Helen Raceway/Dubya USA World Vet Nats

Terrain: Sandy top soil AM with hard pack in PM 

Start: Dirt

Avg Lap Time: 2:36

Total Number Of Motos: 4motos (Two20 minute pluse 1 lapmotos and two 5 laps motos)

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

2022 Yamaha YZ450F: 

Engine Hours 32.6

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: -7mm down and -5mm back peg position/stock bar height/rear hole

Gearing: 13/49 Sunstar Sprockets/DID ERT3 Chain

Engine Mods: Vortex ECU Mapped By XPR/Akrapovic Evolution Full System

Engine Oil: Blud Racing 10/40 Pro Series

Fuel: VP T4

Holeshot Device: WC

Graphics/Seat: DeCal Works Keefer/Stock YZ Graphic/GUTS Racing Ribbed

Suspension: Enzo Racing Test Fork/Shock Spec #KK148

Air Filter: Twin Air Power Flow Kit 

Plastic: Cycra Power Flow Kit

Results: 1st 40 Pro (1-1), World Cup 40 Class (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 yet pulled hard enough in third gear to climb hills fast.

            •           YZ450F feels slightly heavy on entry (lean in) on shallow ruts.

            •           Fork has better comfort when ridden at race pace. Not too much comfort on initial stroke (light bump) as I feel initial part of stroke is too soft. This allows fork to ride in too low off throttle.

            •           Shock sag at 105mm made for acceptable balance, but sped up rebound +2 clicks to compensate for choppy conditions so rear can follow ground more.

            •           WC start device was better off the gate when set at 130mm for dirt start.

            •           Updated rider triangle (-7mm/-5 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 #KK148F)

C: 11

R: 12

Height: 2mm

 Shock: (Spec #KK146S)

LSC: 12

HSC: 1.25

R: 11

Sag: 105mm

The reasons for picking the Yamaha to race at Glen Helen is for stability and comfort. Bump absorption, straight line stability and front end feel is paramount at Glen Helen and theYZ450F provides the most of those consistencies on a fast/hard pack track.