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Yamaha MX & Off-Road Dirt Bikes
yz85 problem and piston questions????
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[QUOTE="Jasle, post: 1280086, member: 26675"] a 1mm difference is HUGE. that is .040" of an inch. you should only have about .003" clearance. You NEED to measure the cylinder and see which piston you need. A,B,C you can get different size pistons to fit stock bore cylinders. your cylinder should be stamped. and 25hours could be way too long depending on the cleanliness of the filter and if the rider over revs it. if the cylinder has been ported it can eat up pistons if they didn't chamfer the ports correctly. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
yz85 problem and piston questions????
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