Small Engine Repair: How to Adjust the Mechanical Governor
video synopsis on small engine repair by: Chakka S.
The type of governor used on this engine is centrifugal flywheel mechanical governor and the components you need to concern yourself with are the governor spring which is right here governor arm which connects to the spring which is right here and then up here is a cross shaft which u need to know that sets and this lock nut here for the governor arm.
You need to loosen that up to adjust the cross shaft; the cross shaft is the part actually connects to the mechanical governor which is located inside this engine crank case.
The way that this governor works when your full throttle is this spring here holds this governor arm all way that way which forces your throttle wide open and your engine cranks up and get up the speed and then the fly weights, the centrifugal fly weights on the governor start to oppose this spring, the governor spring here and actually force this arm in the opposite direction. When their force is equal to the spring force is where your throttle will be set up where will stop and you can see when I pull this way you can see that the throttle up here and seems right inside here starts to close.
So it will rest in a certain rpm that’s how it governs the engine speed. If your engine counters the load, it will lower the rpm decreasing the force centrifugal weights of the governor and then spring force then will be greater then it will pull this arm that way again and that will open up the throttle over here. Supply more fuel to the engine which will increase the engine speed and then the opposite low curve. The flywheels on the centrifugal arm will start to oppose this. Spring even more point in this way until there is a balance. The way that you adjust this governor system is to take this governor arm and hold it all the way, that way as far as it go.
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