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You're right.66mm bore x 72.6mm stroke.The wives' tale about short stroke engines not having strong torque at low rpm is 95% BS.There are car engines with 3" stroke that make maximum torque between 1200 rpm and 1800 rpm.A short stroke engine just doesn't need as much cam duration at the same rpm as a long stroke engine does.With the same cam duration they're both happy at the same piston speed,which means more rpm for the short stroke engine.Cams that were happy in a 650 triumph engine at 4800 rpm wouldn't have been happy until 6200 rpm in that short stroke 500 with 63mm stroke.
You're right.
66mm bore x 72.6mm stroke.
The wives' tale about short stroke engines not having strong torque at low rpm is 95% BS.There are car engines with 3" stroke that make maximum torque between 1200 rpm and 1800 rpm.A short stroke engine just doesn't need as much cam duration at the same rpm as a long stroke engine does.
With the same cam duration they're both happy at the same piston speed,which means more rpm for the short stroke engine.Cams that were happy in a 650 triumph engine at 4800 rpm wouldn't have been happy until 6200 rpm in that short stroke 500 with 63mm stroke.
