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.

 

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.

 

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.