Torque X RPM divided by 5252 = HP. You have to increase torque and/or RPM to get more HP. But there is a maximum speed that the piston can travel at, as it accelerates from 0-100MPH (or more) and then decelerates as it goes up and down.
Changing the stroke changes where the torque peak occurs. For the riding I do, I'd much rather have an early R1 (long stroke) than a newer one. And for racing across an intersection, a cruiser, with it's torque peak right off idle, will win without any fuss. Plus, they are impossible to stall at a light.
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