Now I have a question of you RCGF users, I and my flying buddy both have new engines, mine is a 62 and his is a 45.
The question is why would they both viberiate at low RPM's 1850 to 2k we both balance our props and spinners, both have only about 15 to 20 min run time, they are easy to start great throttle response and hi end. we normally pre-tune on the test stand and then put them in a plane and fly them for brake in, for about a gal std 87 oct gasl none ethenol at 35;1.
cheers Bob T