Whether it's a one cylinder or on up to sixteen cylinders.Not really meaning to get off topic on two wheelers) Only one cylinder fires at a time.I don't know about the newer Harley Davidson Motorcycles, but the older model (I have never owned a Harley Davidson Motorcycle before, not a real one, I once owned a small made in Italy ''Harley Davidson Motorcycle'') Harleys fired off both cylinders at the same time. cuhulin
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16 years ago