Does anyone know what Pro X piston fit what stock cylinders, Pro X uses A,B,C Yamaha uses 10,12,14. This is for a GP1200R 2001

You can take a look at the top of your piston and there might be a letter on it.. I think mine was "D"... Stock used 80mm pistons. If you are replacing one, try and get the letter you are replacing.. If you are replacing all three, pick a letter.

I just replaced my OEM with Pro-x. So far, so good.

I'm fairly sure Pro-x letters correspond to the letters yamaha has listed in the manual-thats how I ordered mine.You go by the number stamped on the top of the cylinder to the right of the powervalve housing.
0-5= A =red
6-10= B =orange
11-15= C =green
16-18= D =purple

ou would think US Crome would know this, I ask them to send pistons for a #10, and #14 cylinder.They sent me all B's

Go with the biggest size available on all three,and have your cyls diamond honed to fit.You could probable send your cyls & unused pistons back to us chrome for an exchange & hone

thanks, that sounds like the best idea