400 head valve adjustments

1 reply to this topic
  • kounkel321

Posted May 11, 2007 - 12:50 PM


hey i out a heads off a 99 yz400 on my 2002 yz426...got it all together and she ticks pretty loud...it starts on 3rd kick everytime, but is the ticking a sign that my valves need adjusted? Also if so, anyone know the correct specs for a yz400f and the cheapest place to get shims if i need em? thanks alot

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  • grayracer513

Posted May 11, 2007 - 03:26 PM


Intakes: .10-15mm

Exhausts: .25-.30mm

The shims are the same as for any YZ4xx, and also the same as those for a CRF450 (9.48mm diameter).

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