RE: Breaking in engine for a pusher prop airplane.
Hi Jim_Purcha
I have had many pusher prop planes. A pusher prop engine WILL overheat when running on the ground. For adjusting the engine, I always put on a standard prop of the same pitch and diameter. Then I change to the pusher prop and take off. I try to take off withing 30 seconds of engine start to prevent overheating. Please understand that an overheated engine cannot be properly adjusted. The fuel can boil in the carburetor and screw up the adjustment.