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bryan103

98 yz400 valves

5 posts in this topic

I believe the 400 is the same as the '00 426 (SS valves), which called for .10-.15mm at the intakes, and .25-.30mm at the exhausts. Try to double-check me on that.

The valves are to be checked at TDC of the compression stroke. If adjustment is required, carefully retorque the oiled cam cap bolts to 75 inch pounds (6.1 ft/lb) in 3 steps. (the manual will call for 86 in/lb, but that's too much, IMO)

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