I have a KB 572 that lost a rod and needed a new piston that got beat up in the process, among a few other things, It has Diamond 4.5 bore 18 deg 13cc dome ect. So I ordered 2 pistons(so I would have a spare) received them and the weight on the spec card said 625 grams. Wow... when I ordered these I told them that I needed as close to 594 grams as possible. They said no guarantee on the weight.
So the question is How do I loose 31 grams off these pistons?