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Ok i have an indy 650 that i love more than my girl friend , it has 3300 miles on it and 118 - 120 psi on all cold. I already have dg pipes on it. I bought it this winter after i crashed my old one. I have a comet clutch that i am going to be putting on it and an extra 10 with a really nice track. I am looking for suggestions to make more power next winter. the two things that i have come up with is milling the heads for more compretion, and borring over and going to bigger pistons. any one know how much i can bore over? and what else can i do for more bottom end power i do not want to gear down because i dont want to lose top end. any ideas from more experienced engine builders would be helpful thanks
 
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