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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
XR440 kit
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[QUOTE="SFO, post: 142222, member: 21864"] I must confess, I can't figure out how a brittle valve seat would create smoking on start up. I have seen high head temps on air cooled motors, turbocharged drag bikes and single cylinder rotaxes. What I have seen is valve seats lose concentricity to the guide in high heat situations. Also I have seen valve seats fall out. Putting new seats in a rotax head we would use .008-.010" interference, or press. One or two mile races on a rotax and check your leak down. The new liquid cooled stuff is nice because the heads keep a valve job longer. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
XR440 kit
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