As far as I know, Govenors are basically arms which use the air rushing off the fan to push them outward. As the paddle part of the arm is pushed outward, the throttle position is lowered to maintain steady engine rpms. When it detects the engine rpms are lowered while the throttle is set high, it will raise rpms. I could be wrong though. I'd check the condition of your throttle springs and the tabs which the linkages connect too.
