I have OS 120 AX in FuntanaX100, on 20% Wildcat, APC 17x4 prop. On the ground the motor runs perfect, I can't get it to stall no matter what I do. Yet in the air, the motor leans out in level flight at slower speeds (below 1/2 power) and sometimes it stalls on spool up. I opened the low needle from 3/4 to 1 turn, and helps, but now I seem to run to rich, constant smoke trail, it will not stall now, but stumbles a bit on spool up. It runs much better, yet for 3D I am not comfortable it will not cut out on me.

So will a Perry Pump help make the motor run constant (air/ground) no matter what attitude the plane is in ? Anyone try a perry pump with the 120 AX ?

Any help would be great.

Thanks