RE: Saito FG-20 or 21
It is the carb design. Saito is trying to use the glow needle valve to adjust this motor. The needle valve should be with a finer tip to give more adjustment. The blunt tip only gives you a click either way of adjustment. A Walbro carb would make the FG-20 purr like a kitten, instead we have the Saito carb, i rest my case.....
R/C Foolish