Got some numbers on he 50cc today. It belongs to a flying buddy. We dialed it in on a Xoar 23x8. It has only had about 1/2 gallon through it and is turning 5780 rpms. Also hooked it up to a digital scale to get an idea of how it pulled. The scaled read 26 lbs 13 ozs. It may get to 6000 rpms with some run time.