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sk8bd117

08 yz450f engine knocking after rebuild

3 posts in this topic

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.

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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?

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