08 yz450f engine knocking after rebuild

I have a 08 yz450f that I just did the top end on. Everything including new piston, new sleeve, and new cam chain, and the gaskets.. During the first start, the engine had a clanky knocking noise. It sounds like a piston slap, like a metal on metal sound. The sounds builds with the throttle.

Did you remember to release the cam chain tensioner from the retracted position?

New sleeve?  Did you actually have a new sleeve installed, or did you replace the cylinder and just calling it that?  What piston did you use, and what was the piston clearance?

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