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

valve clearence gone bigger?

2 posts in this topic

Hi all, I

I checked the valve clearance on my 04 wr450 this morning, I had to re-shim all 5 valves because the gaps were one size too large. The bike has hotcams fitted, was shimmed when I fitted them a while back.

Is this normal? I thought they got tight with wear and use etc?



Share this post

Link to post
Share on other sites

In typical use, yes the clearances tighten up. What happens is the valve and seat mating surfaces wear over time and for lack of a better term the valve rises up into the head tightening up the clearance.

In your case though what you're seeing is the cam lobe surface breaking in. It's hardened but it still initially wears a bit until it gets that pretty polished surface plus the metal compresses a bit under pressure.

I'll bet next time you check it it'll be just fine.

Edited by Sknight

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