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  1. thephantom

    Extreme bore stroke ratio

    I build and race small (150cc) 4 stroke roadrace motorcycles. The new engine I'm building has a bore of 75mm and a stroke of 35.5mm and is a water cooled 4 valve. Has anyone had any practical experience, as apposed to theoretical, on anything like this? My 2 valve air cooled twin 150cc is making...

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