RE: The Thunder Tiger GP-42 and air bleed carburetors
Like Dave H I always find that I need the air bleed holes open all the way because they usually tend to run rich at idle regardless. That's for my Enya and OS two strokes. But I have not yet tried my TT GP 42. When I do, I'll keep your experience in mind.
Is it possible your GP 42 is not fully broken in yet? The usual symptom of a lean idle is that the engine instantly dies with no smoke when you advance the throttle. I'm surprised it would be noticeably hot...unless it is not quite broken in.
Jim