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motox903

yamaha valve clearance

3 posts in this topic

yz450f what makes intake valve clearance too tight. im reshimming. just wondering why they were tight.

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When the valve face and/or seat wear, the valve moves up into the head, and clearances tighten. If your engine needs a shim .10mm smaller than it started out with, or if the clearance tightens up again in a few hours time, it needs new valves.

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