yamaha valve clearance

2 replies to this topic
  • motox903

Posted March 03, 2011 - 05:31 PM


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

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  • brentn

Posted March 03, 2011 - 07:12 PM


Sounds like the valve lip is wearing, the seat or both.

  • grayracer513

Posted March 03, 2011 - 09:42 PM


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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