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Yamaha MX & Off-Road Dirt Bikes
Help please, burning piston after piston?
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[QUOTE="Uchytil, post: 1364945, member: 43803"] This may sound goofy but - pull off the water pump cover and see if the impeller turns when you crank the engine. My son's 04 YZ250 (after he did a top and bottom rebuild) was running hot and he burned two pistons (exhaust side). I told him it was running to hot and he checked the aforementioned item. He had sheared the gear teeth which prevented the water pump from turning -easy fix. Not saying that's your problem just one of those things. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Help please, burning piston after piston?
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