From memory, the stub axle is a push fit, gently heat the casing and it should drop out. It's normally the generator shaft bearing that fails in my experience, that the one in engine case.
https://www.r1-forum.com/threads/starter...ll.568473/
If the front cover bearing has gone you will be able to feel and hear it.
https://www.r1-forum.com/threads/starter...ll.568473/
If the front cover bearing has gone you will be able to feel and hear it.
Later