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Machinist/engine guys are all about the wear from revving with no lube on a precision bearing, which is the essence of a good bearing. Tip bearings are big imprecise grit tolerant fat needle bearings, if you've ever seen one apart. Going back and forth between solvent and air spin can speed up...

If you think your nose sprocket is gummed up, submerge it in varsol and keep spinning it (no chain) until crud stops coming out. This will also remove hardened grease if you're patient. Then either regrease or oil the cleaned nose bearing. I've seen dirt come out once, definitely not good for...