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

jetting WR426 the never ending topic help J.D.

2 posts in this topic

I have setup my bike with the following jetting. I however have not had a good day to ride and would like to know if I am wasting my time..

I have setup

175 main jet

45 slow jet

200 main air jet

EKN needle 4th clip

Air box top removed

Baja designs Vortip in exhaust.

o-2000 foot above sea level

wr timing

I understand I will never get to the "disable the accel pump" level but am looking for the best simple jetting. Because I will probably never be a racer.

Comments are appreciated (even abusive ones) :)

Thanks Andrew

Share this post

Link to post
Share on other sites


Try a smaller main jet - #168 and 1 1/2 - 2 1/4 turns out on the pilot (fuel) screw.

This is close to the '01YZ426/YZ&WR250F jetting.

If you have any specific problems feel free to ask. :)


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