I have a new DLE55RA that I have been running upright on a test stand. It has been running beautifully right out of the box, very smooth, very nice all up and down the power band. I installed the motor on my new P-47, inverted. The motor is running like crap. It will start and idle just fine, run up to about mid rpm and then that is it. If I try to open the throttle it bogs or dies. I have tried leaning the high end and richening the high end, nothing seems to work. I'm not new to gas engines.

Does anyone have any idea what is going on, can provide any guidance?

thanks, Steve