Whats meant to happen is that the throttle when closed should have nearly no tension on the spring.
When the throttle is open the spring should have tension, how much tension is directly related to RPM. The end where the spring is anchored to the bellcrank is the fixed end. The end that goes into the govenor rod end is the fighting end, the throw of the govenor and the tension on the spring move the throttle butterfly to maintain constant RPM. How tight the spring is relates to how high the RPM.
So whats needed is some creative bending of that tab on the bellcrank. It can be a pain on those motors, like was mentioned the arc of movement you get bending it sets it over the bellcranks pivot point. A bit of a Z bend can help. Ive had trouble with some of those Quantum motors. They dont idle very low, especially if fitted with a brake handle. The arc of the spring attachement point does not vary much in distance from the loop in the govenor rod.
Looking at the picture i would say that the spring anchor point needs to be bent around to at least 90 degrees. Then it will be pulling on the spring. When the throttle is shut off, it will be moving the right way.
Bob.
