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Message: [QUOTE="Sawblade, post: 504018, member: 19971"] Yamaha has different size pistons I believe in A, B, C, and D sizes. When you do a top end job you have to match you top end with the correct size. This is due to manufacturing tolerances. You didn't say but have you done a top end on your bike since you bought it? If so, did you match the top end to the correct size? Sorry to hear your day ended early on Sunday. I'm bikeless at the moment, but took my son out on Sunday to the new track. The track looks like a lot of fun. We need to hook up in the spring and pound out some laps once I have bought a bike. [/QUOTE]