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Mike Hunt 69

yamaha yz450f valve clearance specifications

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I need the valve clearance specification for a 2005 yamaha yz450f. it is hard to start so im going to adjust my valves but not sure what to adjust them to. if someone would help me out that would be greatly appreciated. thanks

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Intakes: .10-15mm

Exhausts: .20-.25mm

Download your own manual:

http://www.yamaha-motor-europe.com/community/service/manuals.jsp

It's probably not the valves.. However, if you need to shim any of them more than .10mm, it's time for a valve job. If you doubt this, recheck the valves again after one or two more rides, and you will almost certainly find that that particular valve has already moved out of spec.

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