One of the techniques CL guys use, especially with inverted engines, is to attach the igniter and then, with the venturi plugged, and a firm grip on the prop, turn the prop several times until a "bump" is felt. Then back off and flip the prop with the chicken stick (NEVER by hand, especially with APC props). The engine should start on the first or second flip. With RC, you would prime at WOT, and then go back to 1/3 or 1/4 throttle to start. Also, I've had good results using Fox RC Long w/Idle Bar plugs.
Glen