Piston Size?

[Facinus]

I bought a blaster not too long ago. The ring broke and scarred up the cylinder. Not too bad, I suppose but the slot where the ring is supposed to go on the piston is all flush. It scraped the ring and piston together at that point. Anyway, I'll probably have to bore the cylinder. Will I need a different size piston? The scars aren't very deep at all. Also, the piston that was in it had "125" marked on top. What size is that?

Thanks

 

[yb200]

your best bet is to take it to a shop and have it measured and have them tell you if you need a bore and bigger piston