The very fine adjustments are typical of a YS engine. Not everyone has the patience or the finesse to be able to own them and fly them, but for those who do they are in a class by themselves. Like most any high-performance, high-quality piece of equipment, it's best to use tweezers insted of a hammer to adjust them, if you know what I mean, and not everybody can do it.

Glad the glow driver idea worked for you. I used to repair small engines for a living (lawn mowers, chain saws, etc.) , and most of the time 90% of the difficulty in repairing one was in diagnosing and determining what was wrong, not in the actual repair itself. So you learn to think along the lines of eliminating some of the possibilities. Once you know what it "ain't", you can begin to focus in on what it is.

Anyway, glad it worked. I, too, suspected it was rich, and that was the best way to test it out. Happy Flying!

David