RE: SIG Aviastar .46
I am now down to 1/4 turn from closed on the low speed mixture and the idle is still rich, mid range is good. I am using 15% Omega and a Master Airscrew 11 x 5 prop. I have tried the following plugs: Fox Std Long, Fox RC Long with idle bar, Fox Miracle plug, McCoy MC59, McCoy 4 stroke plug. The hotter plugs give a better idle but too fast to get any reliability. Advancing the throttle causes the engine to hesitate, stumble and throw lots of smoke till it clears out then runs. Mid range to high throttle is good. Idle to high throttle is poor.