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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Insufficient compression + low coolant = ??
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[QUOTE="KaTooMer, post: 450124, member: 16246"] The bike: 1999 KTM 300EXC The symptoms: Loss of compression, coolant level low. The story: My last ride was a race, and could tell that compression wasn't what it used to be. Ran O.K., noticed the smell of antifreeze after dropping the bike a couple times, finished my race, but near the end the engine didn't feel right (blamed in on a very dusty race and a dirty air filter). In prepping the bike for a pleasure ride yesterday, I had to add a lot of coolant. Engine wouldn't start yesterday, so I pulled off the cylinder head today. Guess that flaky stuff on the piston is coolant residue. Kind of cool - sort of peeled right off and the piston was still shiny underneath. Cylinder head has some carbon residue on the front side where the leak must have been. However, the O-rings appeared to be fine. No melting, no nicks or breaks (Cometic o-rings). On a flat surface, cylinder head shows no signs of warping. Would seem to be a case of a bad O-ring, but before I put it back together, does anyone have any other ideas, things to check out, take apart, etc? Thanks. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Insufficient compression + low coolant = ??
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