One_Bad_400
04-16-2007, 06:30 PM
Ok... I have a 450R, so the last race of the season last year i threw a cam chain and messed up soem stuff... as of right now it has a Curtis Sparks pro motor in it with a 15:1 compression piston in it... well its at my engine builder right now getting put back together and my engine builder is telling me he wants to replace that piston fro a 13:1 comp. piston for reliability issues becasue he has seen the 15:1 gernade cranks and crank cases... what do ya'll think and have you hurd of the 15:1 blowing the bottom end?!?!?! need to know before the end of tonight to tell him what to do tomorrow... thanks!