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Colors vs Letters 125 piston sizes

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I've noticed that some web sites with Yamaha part numbers are changing from what was a letter stamping on the underside of the cylinders to color coding.This is already a confusing issue and it seems to have gotten worse. I want to install stock piston and rings or weisco and as replacement with was in the past supposed to be a "D" because it was recommended to go with it. Does anyone have any info on this ???

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