numbers on top of new piston

[darrell43031]

i have a friend who asked me what the numbers on top of the new piston mean and i wasn't quite sure. and now it's bothering me to. in big etching it says 0.50 mm. what exactly does that mean is it .050 mm. bigger than stock or what? not really important just bugging me

[nofearhonda]

Yes its bigger, dont quote me but I think that .50mm = .020

[darrell43031]

so how many more cc's would that give you? it's for a 250x i think?

[Fuchs42]

about 4.32 ccs