HEADS UP!!!

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
alfie

Hey guys help needed again

4 posts in this topic

Hi all Ive finally got around to rebuilding my 01 wr 426 top end, its had all the valves done, new cam chain, high compression je piston kit and a hot cam exhaust cam. which has all been set up buy a friend of mine who is a mechanic.

Now the problem ive got is at quarter to half throttle it stutters and pops and when it gets past half throttle it clears and takes off like scaled cat.making it quite hard to ride when trail riding. it also sometimes pops and spits back on the over run. So any help to sort this problem out would be great. its also a stock u s exhaust muffler.

Share this post


Link to post
Share on other sites

I would start with what's speced for a YZ needle. Depending on where you live I'd also recommend a 168 to 170 main jet. JD would be the better, yet more expensive option.

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