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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
no start, no compression
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[QUOTE="rmc_olderthandirt, post: 1434490, member: 68872"] Unregistered guest: You should have started a new discussion instead of commenting on one from 8 years ago.... The key here is your "no compression" comment. If you have no compression, the bike will not run. You can try all you want but compression is required for an internal combustion engine to operate. The statement that you can push your kick start down by hand is not a good measure. I can start my bike pushing the kick start with my hand. I have to push it HARD, but I can do it. If you have noticed that the kick is much easier than it used to be then it is a good indication that you have lost compression. If you are not sure, get a compression tester and use it to see what your compression is. I suspect that the top end has siezed. Doesn't matter that it had just been rebuilt, although a failure so early indicates that something else was wrong. It is possible that the top end was put together incorrectly last time (an example would be NOT getting the rings set properly on the pins). The ring gap could have been too tight. It could have been the wrong size piston. Did you rebuild it, or have it done? If the top end had been rebuilt properly then it is possible that your jetting is too lean and the piston is overheating. Or you could have run the cooling system out of water and overheated the engine. When you said it "died out of nowhere" it doesn't help much. Was it on a long sustained full throttle run? Fighting your way up a hill? Putting around at low speeds? The bottom line is that no/low compression equals top end rebuild. You might learn more when it is torn down. To keep it from happening again you should check your jetting and perhaps your riding style (i.e.: don't hold it WOT for miles down a sand wash.) Rod [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
no start, no compression
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