That little bearing is right smack in the middle of the works. The governor is of a flyball design, and works by balancing the centripetal force of the turning weights with springs acting in various direction on the different parts. The bearing itself is around the thrust shaft. All of the spinning parts in the governor spin around that shaft/spindle. One side of the bearing rests on sort of a bushing that the weights act against, the other face of the bearing acts on the shaft that operates the arm that actually adjusts the carburetor, so it does need to be there and in good repair.
Now about the bearing itself. It could be just fine, just all come apart. In its normal state, as a brand new never installed part, the only thing holding it together is a few dabs of grease sticky enough to hold the balls between the two cups that form their races. Once installed and the grease spun/worked out of it all that holds it together is the tension between the various parts of the governor. It's not at at all unusual for it to come all apart and send little balls flying everywhere the second the tension is taken off the thrust shaft when the governor is removed.
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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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