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**Always follow the instructions in your repair manual when doing repair or maintenance work on Outdoor Power Equipment. Manuals can be found at the manufacturers website.** The 25HP V-twin Kohler engine fitted with a carburetor uses a centrifugal flyweight mechanical governor. The governor is designed to hold the engine speed constant under different loads. The bulk of the governor is contained inside the engine crankcase and is gear driven by the engines camshaft. This is how the governor works. The flyweights on the governor move outward by centrifugal force as the engine speed increases. The higher the engine speed, the higher the centrifugal force acting on the flyweights. As the flyweights move outward, they turn a shaft called the cross shaft, which is connected to the governor arm. The governor arm is located outside the engine and is connected to the governor spring and the throttle valve on the carburetor. The governor spring force always tries to hold the governor arm and throttle wide open. When the engine reaches a speed where the centrifugal force on the flyweights and turning force on the cross shaft is equal to the governor spring force, than the engine will stabilize at that engine speed. The governed speed of the engine is always the point when the centrifugal force on the flyweights and turning force on the cross shaft is equal to the governor spring force. When the engine encounters a load, the engine slows down, and less centrifugal force is acting on …