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Everything Dirt Bike
Make / Model Specific
Yamaha
Piston sizes?
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<blockquote data-quote="2Wheels" data-source="post: 213917" data-attributes="member: 3804"><p>Yamaha has abcd pistons to achieve exacting tolerances with mfg anomalies. The cyl comes off the line + - .0000" and they match with the piston size most closely suited. Personally, if Im getting the cylinder replated, I send a new piston or have them supply. If honing only, just get a D size. The difference between a brand new A cyl (smallest) and new D piston (biggest) is .0012" which is .0004" below min spec. But, if your honing a used cyl you can't go wrong with a D. And I believe that's a stock cast. after market like weisco just have the one size. Yamaha oem is just way anal about it. Theyre the only ones who do this if I'm not mistaken</p></blockquote><p></p>
[QUOTE="2Wheels, post: 213917, member: 3804"] Yamaha has abcd pistons to achieve exacting tolerances with mfg anomalies. The cyl comes off the line + - .0000" and they match with the piston size most closely suited. Personally, if Im getting the cylinder replated, I send a new piston or have them supply. If honing only, just get a D size. The difference between a brand new A cyl (smallest) and new D piston (biggest) is .0012" which is .0004" below min spec. But, if your honing a used cyl you can't go wrong with a D. And I believe that's a stock cast. after market like weisco just have the one size. Yamaha oem is just way anal about it. Theyre the only ones who do this if I'm not mistaken [/QUOTE]
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Piston sizes?
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