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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
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[QUOTE="Colorado, post: 937094, member: 60368"] Like twoofeach said, running one day and not having compression a couple later isn't what one would expect, and ring wear doesn't happen suddenly while the bike is sitting still. I'd isolate the problem before i started buying parts. What do you ride? I ride old air-cooled bikes, and would do a compression check first, then question my head gasket seal --- check head torque --- make sure I screwed the plug back in tight --- things like that. The ports would limit the areas compression could escape. If those things were okay I'd pull the cylinder and check ring clearance --- but losing all compression at once doesn't sound like rings unless they broke, and I don't see them breaking parked in the garage. It seems the newer water cooled bikes also have power valves related to the exhaust, but I'm not sure just what they do or if one could stick open and release all compression. Autos with water cooling sometimes have head gaskets go and lose preasure either out to the atmosphere or sometimes between the cylinders and the water sleeve (when they overheat and you can usually smell antifreeze in the exhaust) but I know next to nothing about water cooled 2-strokes. Sorry I can't help more. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
no start, no compression
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