Piston sizes=how many cc's?
 

I was searching for new pistions for my 300EX, the thing is I wanna get as close to a true 300 as possible. I have seen Wiseco pistons from .040 to .080 over stock, I was wondering about how many cc's these would give me. I just starting racing MX and I would like a little more power, but with out going really big.

Piston sizes=how many cc's?
 

Boring does not give you noticeable power! Just go with the first overbore, then the next next time you have to rebuild. Don't waste a good cylinder by going with the max the first time.

Piston sizes=how many cc's?
 

Your stock cc is 282. With a .040 bore, you would go to 289.5cc, and with a .080 bore, you would be at 297cc.