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I don't want to say one way or the other if you should change them but that is wear. When I purchased my Norton I was told the motor and transmission had been rebuilt and every thing was gone through. It ran great and I had no reason to doubt it, fast forward 10 years and I just wanted to do some wrenching on it. Well when I opened the gearbox I could not believe my eyes, All but a couple of the gears looked worse than that and it was clear it had suffered a layshaft bearing failure. The bore for the replaced layshaft bearing was wasted and the bearing was loose I mean loose, The main shaft was badly worn and also the lay shaft. The case was also worn from the gears hitting it, to my thinking it was toast. A couple of the gears had what looked like grooves in them also, and the bushings looked like they were the original and loose on the shafts. And to think I rode this bike like that for so long and never noticed any noise or vibration, and we used this bike a lot and the wife always liked to ride on this bike the most. I ended up buying a new case for it and replaced all but a couple gears and replaced shafts, bearings, bushings, you name it and it was replaced. It probably depends on how hard your going to ride it, Chuck.
I don't want to say one way or the other if you should change them but that is wear. When I purchased my Norton I was told the motor and transmission had been rebuilt and every thing was gone through. It ran great and I had no reason to doubt it, fast forward 10 years and I just wanted to do some wrenching on it. Well when I opened the gearbox I could not believe my eyes, All but a couple of the gears looked worse than that and it was clear it had suffered a layshaft bearing failure. The bore for the replaced layshaft bearing was wasted and the bearing was loose I mean loose, The main shaft was badly worn and also the lay shaft. The case was also worn from the gears hitting it, to my thinking it was toast. A couple of the gears had what looked like grooves in them also, and the bushings looked like they were the original and loose on the shafts.
And to think I rode this bike like that for so long and never noticed any noise or vibration, and we used this bike a lot and the wife always liked to ride on this bike the most. I ended up buying a new case for it and replaced all but a couple gears and replaced shafts, bearings, bushings, you name it and it was replaced. It probably depends on how hard your going to ride it, Chuck.
