RE: Front carb RCGF 20cc or other?
Henry,
I rotated the prop 1/3 and bolted back on and now it idles much smoother. Who knows, maybe some improfection in engine shaft and prop hub, but now they are matched up, so I marked the engine, prop and hub so I can always put them back on the same.
I aquired another RCGF 20cc in a Hanger 9 Hellcat. The engine had never been run. Started ok and broke in with the 20 minute ground run at 2,500 rpm. Then fitted with a Master Airscrew 16-8 prop. Still running a little rich and on a 30-1 fuel mix, it will turn 7,700 rpm and seems to produce plenty of thrust. I need the big prop because of the large cowling.