A mate of mine is learning fly a chopper , he has just got of the ground , about 2 to 8 ft , but the chopper looses power after a while in the air , his pitch curves and pitch settings are ok , sometimes he battles to get it off the ground

he was told that the engine needs to be taken out of the chopper and bench run at max throttle for a few tanks , the term used was" a stubborn engine " , as it was not run in at various rpm's or throttle range , to me this seems like a ""memory "problem !!!! The engine is a webra 32 FH

any views !!!