Don,

Just as an aside, attach a stick or similar to your electric starter, and tach' it. Let's say it spins at 2500rpm. Now get your engine running at the same rpm, say 2500, and look where the throttle stick is. THAT is a good place to set the throttle on start-up, as it will be the speed the tacho spins (roughly - load slows it a bit). For my .50 - .90 4-strokes, it's usually a bit above idle.

Once you've set your full-throttle mixture (via main needle) with the stick firewalled, pull it RIGHT back with the trim up, and use EPA to get a reliable slow idle. Then bang it open - cut is lean idle, splutter is rich idle - tweak idle screw until get a smooth transition from idle. Once done, pulling the trim back (when at idle) should cut it.

I generally set my idle a bit on the high side for safety, then go back to mid-trim when preparing to land. So full up trim is fast idle, centred is slow idle, full down trim cuts the motor.

Just be slow and methodical and you'll be fine - I'll often spend a session at the field with a new plane just twiddling the engine and not even fly, which takes the pressure off. Go home, tighten all the loose screws then fly it next time out.

Cheers,

Cam