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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
04 Yz250f
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[QUOTE="Imho, post: 713209, member: 28822"] I don't have any tips on the centre valve but I believe that it is better to have clearances on the loose side rather than the tight side. As the valve seat wears the valve seats deeper in to the head, therefore reducing the bucket/lobe clearance. The worst scenario is the valve eventually closes the gap and doesn't seat properly. Burnt/damaged valves and head are the result. If the clearance is loose it may well detract from the performance but it just means the valve will open later and close earlier. Even slightly reduced clearance (below min. spec) can open the valve too early/close it too late and accelerate wear. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
04 Yz250f
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