RE: Saito FG-20 or 21
Hang in there. It took me about nine months to get my FG-20 sorted out. It now runs as well as any engine I own. I am swinging a 17-6 prop 7700 RPM WOT and 1900 idle. Flies a H9 J3 Cub beautifully including on floats when the all up weight is 19-1/2 lbs. I frankly could not ask for more now that I got it straightened out.
Fred