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slkerns1

2002 wr426 jetting

3 posts in this topic

i have a 2002 wr 426, that i am trying to tune. here are the things that i have done so far. i removed throttle stop, removed air box lid, removed baffle in exhaust. bike starts fine and has good low end grunt but on the top it sounds like there is a rev limiter. obviously its running out of fuel and needs re-jetting. all carb jets are stock, and all the settings are stock also.

i live in michigan and will be doing most of my riding in the summer. any info will be greatly appreciated shawn

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I have the same bike. You can get a lot of jetting info in the jetting D-base sticky thread. Here is what i am running. Hope this helps!

Model (400 - 426 - 450): 02 WR426

Timing (WR-YZ): YZ with 03 exhaust cam

Main jet: 170

Pilot Jet: 42

Fuel screw (turns out): 1 1/2

Needle model/Clip position: JD blue needle postion #3

Airbox lid (on or off): Lid Off

Pipe: White brothers e-series w/six discs and quiet core insert

Altitude where you ride: So Cal 0-4000 ft

Temperature where you ride: 75-110

Degree of satisfaction: Runs awesome quick response/no bog

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