i set the high end needle for 10,800-11,000 on the ground. this is a few hundred rpm rich. the engine runs very consistently set this way- assuming the tank is set with at the same height as the carb inlet.

in the air the g90 unloads on the downhills at least 1,000 rpm.

i used to have a saito 100 in this plane- the g90 is easily superior for the way i like to fly - i fly full throttle for just about the whole flight. but the g90 also runs fine at midrange. the key is tank height and a good breakin, followed by adjusting the carb needles. for the g90s i have never tried to adjust anything except just adjusting the needles. for $129 or so they are an unbeatable value for a 60 size warbird.

ed