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Message: [QUOTE="killer454, post: 1411859, member: 121317"] no other mods that i know of bought the bike used needing a top end rebuild. when we got the cylinder and new piston i noticed it was domed and new ring and rist pin bearing,but did not think the gas could be the problem. the bike does not seem to be making a nocking noise that i can tell,i have two blasturds and it sounds like them to me.plug really rich i did not have nothing done to the head but dont no about anybody before me. only thing i have done to the bike is basically have a LA sleeve installed with new piston (domed),boysen power reeds,it has a pro-circuit header and stock cylincer. im thinking gas my be my problem,im going to put the new seals in and try a 100 octain and see. what ratio would you mix 100 octain at? [/QUOTE]