I have just finished assembling one of these with a gms 76, a pitts muffler and 11X7 prop.
I just switched to the pusher prop and seem to have trouble keeping the engine running.
I cant get the needle valve set correctly before the engine starts cutting out.
Seems to be overheating. Engine runs great with a regular prop on it (problem is it would fly backwards) hense the pusher prop...
any suggestions?