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

Wr426 correct jetting

2 posts in this topic

Recently i have bought a wr426 that has been raced before... However it just had its top end rebuilt and as far as im aware it only has a titanium straight through akrapovic exhaust. . However i think that the jetting jn the carb is wrong as when doing about 2,000 rpm the engine chockes a little as if its misfiring but its chucking too much fuel.. Can someone tell me whats the correct jetting for a stock wr426 and for one that has an acrapovic exhaust on it? Thanks

Share this post

Link to post
Share on other sites

Once you mess with the stock setup there is no "Correct Jetting", only what is right for your setup, waaay too many variables in each persons setup.

A good starting place is to look in the manual.

You should pull out your Carb (you are going to have to anyway to make any changes) and list your current jetting for us to see and I'm sure it would be sorted pretty quick.

Make sure your air filter is CLEAN.

If you are getting a low to mid throttle sputter then it is most likely rich on your needle.(See attached diagram)

A good start is to move the clip to a higher notch (closer to the top) which will lean it out slightly.

You should notice the sputter get less and possibly move to a higher rpm range.

If you get all the way to the top clip position and there is still a sputter, you may need a larger diameter needle.

I suggest this method first as it is a good test and FREE (unless you need to buy a new needle)

Like I said.....List your jetting


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