Can anyone please tell me what the letters C,D, or E on top of the pistons mean; is this something I need to look for when replacing one of my pistons?

 

I found the following someplace and I'm just cutting and pasting but it would seem to be correct.


Let me help. The piston lettering should be engraved on the top of the piston. The lettering designates the diameter of the piston.

The diameter is measured 12 mm from the bottom of the piston
C-marked ........mm 82.950-82.960
D-marked ........mm 82.960-82.970
E-marked ........mm 82.970-82.980

The Cylinder bores are as follows
C-marked ........mm 83.000-83.010
D-marked ........mm 83.010-83.020
E-marked ........mm 83.020-83.030