I used to work at a Yamaha dealer when I was in high school. Like most two strokes, Yam stamped their cylinders A-D. What we'd find though is that when we went to order in a piston for even a 1 year old bike, the part numbers all superseded to one piston. Never new if it was an A, B, C, or D. Not being able to get anything else, we'd get these pistons for the customer, and never heard of any complaints down the road due to piston failure. Wiseco pistons.......... now thats another story. Never heard of one lasting very long in any application. Hopefully GG doesn't take the route of superseding all there pistons to one part no. Obviously there are differences if they are taking the time to stamp each cylinder differently.
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