Search found 15 matches
Hap Jones Pistons for CB72I am assembling a CB72 motor with Hap Jones S12 pistons. Measuring the compression volume gives me 20cc (that's on an assembled motor at TDC), which works out at 7.8:1 compression. Is this right? I found this quote on a CB175 racer site: "Stay away from the common "Hap Jones" 3mm (55mm) overbore pis...
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