No. The frequency valve operates at a constant 70Hz. What varies is the duty cycle - ie the proportion of time the valve is open compared to closed. (I was reading the DMCnews tech pages yesterday, and the DC of Oregon newsletters :-) Martin #1458 mrgolf77@xxxx wrote: > also, when I hit the full throttle micro switch shouldn't I hear a change > with the frequency valve and a slight raise in RPMS? That is not happening. > > > Thanks > David