08 yz450f engine knocking after rebuild

2 replies to this topic
  • sk8bd117

Posted April 03, 2014 - 05:58 PM


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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  • seacraft69

Posted April 03, 2014 - 06:02 PM


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

  • grayracer513

Posted April 03, 2014 - 08:53 PM


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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