I think your right about the long stroke being the main factor limiting the rpm,which is not a bad thing for a bike like the T-Bird.With the right gearing,it can be plenty quick and have a respectable top end speed.My main gripe about my 790 is why Triumph uses such a short stroke on it.It doesnt have the low rpm torque i want and doesnt have the high rpm hp you expect from a short stroke motor.The original 650 had a stroke of 3.22 inches compared to the 2.68 inch stroke of the 790,and it seemed to rev plenty fast but with more low rpm torque.Probaly why its still a favorite among hill climbers.
