Reading the thread about NP200 heat, brought up a question. If my calculations are correct, with stock tires and all stock gearing, 2,500 RPM is about 45 MPH. 2900 RPM will net about 50MPH. This is a real slow turning engine compared to today. What is the rated RPM of these engines? These seem to be closer to the top end of a diesel, not a gasser.