I put a 12:1 compression piston and now the Raptor seems much harder to start. I have heard the One Way Bearing spin a few times and make some god awful noise (looks like I will have to replace soon). Anyone have this problem with a higher comp piston in thier machine?

 

you will need a one-way, get a L&A one way. To get your engine to crank over better get a Grizzley battery. more power and fits in stock box.

 

L & A One way is in there now. I may have to invest in a new battery. Charging her now.