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
amcadavid

yz 426 valve clearance

3 posts in this topic

Advice please,i have just fitted a yz450 exhaust cam in my 426,the inlet cam clearances are spot on but exhaust are a little on the large size, approx .28mm when the manual says .25mm max.Bike now starts real easy (allthough have only just noticed exhaust header glowing red when in work shop)The big question is do i really need to strip and reshim just for the sake of .05mm. Thanks for reading

Share this post


Link to post
Share on other sites

Specified clearance is .20-.25mm. Your clearance is .28mm, which is outside that range. So, yes, you really do need to adjust that.

Share this post


Link to post
Share on other sites

Rode my bike with new cam in and it felt a little flat,decided to take your wise advice and reshim,it was only then that i noticed that my cam was one tooth out (clockwise),moved it round a notch(anti-clockwise) and now the beast is back in town! thanks

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