Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0

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

Share this post

Link to post
Share on other sites

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

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  
Followers 0