I've also been breaking in and doing some flying with my new engine - an OS 50 SX but have two questions.

1. I have it set good and sloppy rich for right now with plenty of white smoke. It is probably OK to start leaning it out a bit, as I've had at least 8 tanks of fuel through it. I have not touched the idle/low speed setting. When I go from full throttle to idle, it initially idles quite fast but will eventually (8 seconds or so) settle down to a low idle speed. And, after idling a while, when going to full throttle, the engine will hesitate/cough before returning to full throttle speed. Does this mean my idle/low speed setting is too rich?

2. OK, this is dumb, but where is the idle/low speed adjustment? The manual mentions it, but does not show where it is on the engine (brilliant). The only thing on the carburetor that looks adjustable is the throttle stop screw.

I need to correct this problem before I go flying again, as flying with an unadjusted engine is courting disaster.

Thanks.

Coastie