Join Date: Nov 2009
Location: georgia's toe-nails of the foot hills
Re: 5hp vertical briggs runs too fast
The spring wants to open the throttle wide, and the governor linkage wants to close the throttle to limit rpms. The spring is normally on the butterfly, as is the governor 'rod'.
As the load increases, the rpms will start to drop, and the governor pulls on the throttle a little bit less. The spring tries to open the throttle butterfly more, to increase power, and will do so, until the governor pulls it closed again. If the load decreases, the governor will pull harder as the rpms start to climb, and will pull the throttle plate towards 'closed'.
If your governor is not pulling the butterfly closed, either the linkage is binding, or broken, or the governor has either come apart internally, or the governor arm is loose on the shaft coming out of the crankcase, and has become mis-adjusted.