pe reivers,
I don't think the engine gets too hot during flight. After a flight I can touch it with my fingers and don't get burned. I also can move the crank back and forth when the motor is cold. I firm tab on the spinner and it slips to the rear. I whack on the back side of the prop and she pops forward. I think the crank slides baock and forth inside the bearings. I need to investigate.