i have been wanting to get a little more power out of my EX and i've decided to get a 416 piston... first i need to know what is the maximum cc's you can have on a fourstroke and be legal to race. where would i go to bore my ex??? and how much would a ruff estimate of how much it costs

 

You can get your cylinder bored at Napa Auto Parts, but the Napa has to have a shop in it. I think 416cc's is the legal limit, I think.