87sheerips Posted September 21, 2005 Report Posted September 21, 2005 (edited) Well, i decided to just get a cool head after not being able to find a new .100 over gasket for the stocker. I ordered a stage IV head, getting the domes cut to 66.5mm for the 100 over. I was told to get 20cc domes so i can still run pump gas while increasing compression. Elevation in MI is about 900 feet above seal level., cylenders are ported, and at 66.5mm bore. Should 20 cc be fine for my application?? Thanks Guys!!! Edited September 21, 2005 by 87sheerips Quote
NEVER SATISFIED Posted September 21, 2005 Report Posted September 21, 2005 yeah... but if you get timing and go about +6 or higher i would run 50/50 Quote
Ducman Posted September 21, 2005 Report Posted September 21, 2005 I would measure the compression, make sure it isn't over 165 or so to run pump fuel. You are getting pretty close to the limits of pump fuel. A bigger bore will up the compression a little bit over a stock bore too, your compressing a larger area (x same stroke = more volume) into the same volume dome. Quote
racerzippy Posted September 22, 2005 Report Posted September 22, 2005 I have the same combo on one of my bikes and run pump gas in it. Elevation out here Vancouver, Washington is about the same. We even ride @ the coast, but I always run super unleaded. Quote
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