I'm installing a new 22cc pro design head on a cyclinder remanufactured by summit racing. I found them on ebay and sold me a remanufactured cyclinder with wiseco piston, wrist pin, and bearing. I bought a top end gasket already, but it wasn't the one badmoonracing recommended in another thread. So I'll reorder. My question is do I need to have somebody in this forum mill the squash if, the cyclinder is oem spec's and the dome is brand new? I'm all for having somebody do it, if it will make my build last longer, perform better.if I do this, am I limited to using only high octane racing fuel? Many questions that I need answered as soon as possible so I can get to riding this thing.

pump gas can cause lots of issues that have be discussed here quite a bit, consensus... it suck. use race gas or av gas to protect your investment.

try to search pump gas on the forum, lots of discussion on it. that is also why im parting a 250 motor that the only had some performance work done to it and ran pump gas...bye bye piston.

Head and port design are the two main players on what type of fuel will work best.  Many people just say you need to run high octane fuel in these quads.  That is true for some, but many people seem to be pissing away money.  I always run 93octane in my 500 and never have a problem.

What work has been done to your 500 engine?

when was the last time you had the motor open to check for signs of detonation?

The motor is open right now because of the tranny issues.  The piston is fine.