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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
exhaust packing woes
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[QUOTE="_JOE_, post: 1316307, member: 77507"] There is a thin coating from the factory that maintains the integrity of the valve. The degredation of the coating is what usually cuases the valves to recess. That's why it's SO important to keep dirt OUT. One little piece of sand breaks the coating down and BAM, that valve's headin south. I've heard most people say the right intake tightens first, which I think has something to do with the carb giving dirt a direct path to the cylinder head. Supposedly the factory exhaust valves are steel and can be lapped. They tend to last a long time, maybe because the dirt gets incinerated during combustion or because it's being blown out? [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
exhaust packing woes
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