Hey.
I'am a beginner, just started flying. I have an Irvine ABC 46 engine. My engine is running great on full speed, and its running good on idle. When I go from idle to full speed it takes 1sec and it goes up to full speed. But if i run the engine at half speed or lower, it sound like an 4-stroke and when i try to get it up to full speed it hesitates, or somethimes it quits. What is the problem, is the idle needle to rich? How many turns should the idle needle be turned out?

Regards Einar