I may be shot for saying this, but I say as long as it starts and runs, it should be no problem. A cub is easy to hand crank. Splitting a tractor to replace a ring gear is a headache. An example is that the cost of the ring gear for a Super A is about $30--a good used flywheel is about $135. A bendix costs about $40. Handcranking is easy, providing your points and plugs are good. In my case, by the time you split a tractor (like a Super A) or in your case a Cub, you have labor in it and you have to replace the fluids (hydraulic), which is costly. If you have the time then no problem. My suggestion is that if you have a hand crank, then you can use that little tractor for many more years until you have to worry with replacing the gear. At the very least, you can put a 12 volt coil on it(for that extra juice to the starter, buy a bendix ever so often..sit back, and don"t worry too much).. How much is too much wear? I agree that if all the teeth are gone, then it is time to replace it. If this was a larger tractor, then this is a whole different story.
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