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Dirt Bike Mods & Maintenance
Some cylinder head questions (with pics)
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[QUOTE="whenfoxforks-ruled, post: 1372743, member: 73147"] If it was not for the valves, I thought it was a 2 stroke. Rich, oil, coolant or man you are getting some bad fuel. The loose seat makes for a really crappy burn. New valves, recut the seats, you got the lap and run deal. Do you know for a fact the "scoring" was not there before? If the cam is not scored, burnt, then the "scoring" in the race could be there to begin with. The marks could be from the original machining, the shiny is the worn area. Measure the id. No skirt pics? How about side to side, small end of the rod bore? How are the thrust washer clearances? Vintage Bob [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Some cylinder head questions (with pics)
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