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 - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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