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How to remove the output bearing.Remove the gear next to to bearing, fit the shaft loosely in a vice so not to mark it and allow it to move and knock the bearing off the shaft so that it moves away from the collar, once it moves a little it will come off easily. Protect the end of the shaft when hitting it. Once off there is a really thin oring fitted between the bearing and the collar, on no account try to remove the collar unless it’s ruined. Do not under any circumstances insert anything between the bearing and the collar.From a trusted sourceSent from my iPhone using Tapatalk
If you mean the part of the shaft where the oil seal sits I'm pretty sure the bearing will come off - just dont heat it and destroy the O ring.
A stupid question but is the roller bearing damaged and worn? The gearbox on Ratty had over 45k on it (probably over 50k as the PO had fitted a mini Speedo on the bike at some point). When I checked the roller bearings they were fine, no play, no nasty rumbling and no tight spots. The rest of the engine was in a terrible condition as a result of the PO blasting it with a sand gun. The roller bearing was good to go again but unfortunately the shaft was worn beyond repair and I purchased the two gear shafts from Ted. I have no idea how many miles were on that gearbox but again the roller bearings were absolutely fine.
It does not take much dirt in a dry bearing for it to feel gritty. I would be looking at more cleaning to ensure any carbon deposits are not the cause. As the bearings have a good wear life I suspect the death knell is corrosion caused by standing for a long time.