- Feb 13, 2005
I see listings on aftermarket pistons (03' KX125) referring to std, "A", "B" etc. Appears these are .01mm larger for each incrementally, and I'm told you really need to know what the bike came with before ordering. Anyway to tell prior to tear down? Once torn dow, how will I know? Is it stamped in the piston somewhere, or needs to be measured to know for sure?