Just to add to the servo question, - Daz is right about the 148 being fine for the gv-1, I have installed fut9402 just to see what difference it would make and it did none! at least I didn't notice anything. Oh and BTW, rich engine will cause the governor to surge, I am in process of braking-in a new engine and my governor is doing about the same thing as you described. Oh and one more thing, make sure your idle settings are not to high, I've had mine set wrong and governor had a really hard time doing it's job, it also caused a little oscillation. Good Luck!