I'm going to key in on your statement "it often starts runing very rough" and maybe take a different slant on your problem. Does your engine really run rough or is it simply surging? If it is rough, you need to make sure the fuel and ignition systems are in order before you get into the governor. Maybe you need a tune-up. If the ignition is in shape and the caruretor is delivering enough fuel, the next thing to check is the linkage between the governor and the carb.
With the engine off, unpin the forward end of the rod that connects the governor arm to the carburetor. Push the control lever forward. Pull the (now disconnected) rod back so the carb is wide open. The pin in the linkage should be able to slide back in without moving the other parts. If it doesn't, turn the yoke on the front end of the rod to the longest adjustment that will let the pin slide in. Make sure that link moves freely with no binding.
Only AFTER doing all this, remove, clean and adjust the bumper spring as already mentioned.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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