With the seal out, can you get a driver on the roller section from the ignition side? I warm the cases and use various drivers I made from brass or aluminum, whatever works, either with a mallet on the bench with a rag protecting the gasket surfaces, or in a press. They usually come out with a few strikes if the case is warm.
Like I said I think the roller is a good deal, I have had no problems. More running clearance likely would mean more vibes, but also more tolerance for bore alignment. They like oil too.
I guess your using what you have, but I'd go with the M206 if you want to run a ball bearing. My bearing guy used to supply Ty Davis the M series bearings for the Yamahas he used to run.
I hit the crank nut with a propane torch and a 1/2" impact does fine.
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