03 YZ450 valve clearences check.

4 replies to this topic
  • radio592

Posted August 23, 2007 - 06:50 PM


Hey guys, I am going to check my buddies valves on his 450 because he does not have the correct tools :bonk: How ever, I do not have a YZ, Im a KX guy but have absolutely nothing against Yamaha. In fact, I would have gotten the YZ but got a great deal on the kx. Back to my question, what are the correct valve clearances for both intake and exhaust valves on an 03 450? Thanks in advance. :ride: :thumbsup:

  • grayracer513

Posted August 23, 2007 - 09:12 PM


Intakes: .10 -.15mm
Exhausts: .20 - .25mm

Downloadable manuals:


How To:


Important!: If you adjust, retorque the caps carefully, evenly, and in steps.

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  • davidl9999

Posted August 23, 2007 - 09:19 PM


:prof: what he said

My 2c:
If you trim the feeler gauges (if they're too wide), be sure not to check with the trimmed edge.

  • grayracer513

Posted August 23, 2007 - 09:31 PM


Standard feelers are not too wide for the big YZF, only for the center intake of the 250F.

  • davidl9999

Posted August 24, 2007 - 09:25 AM


hehe, I spend too much time in the 250F forum... :bonk:

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