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Honda MX & Off-Road Dirt Bikes
Cr250 piston wear
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[QUOTE="76GMC1500, post: 1225457, member: 73139"] It's all explained in Mr. Gorr's book. There's something about hot gasses moving past the bridge at high velocity creating an ionizing charge that pulls clutch debris out of the exhaust gasses and causes them to stick on the exhaust bridge. The debris is very abrasive and wears away at the piston. The clutch debris gets in through the crankcase seal. Any time this type of wear shows up, most people are immediately suspicious of the exhaust bridge clearance. The deal is, once the exhaust bridge clearance is set, it tends to stay unless the cylinder is severely worn. I would only suspect an exhaust bridge clearance issue if the piston showed this kind of wear immediately after having a cylinder plated or sleeved. Otherwise, I would be replacing the right side seal. [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
Cr250 piston wear
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