Al,


The rear bearing in the Moki may be pretty tight in its seat, so 300ºF should be used.
Most other engines can do with 200-250ºF.

It is best to bolt the back-plate back onto the crankcase. This is done to prevent any possibility of the crankcase becoming bent, or warped.
Hold the engine in an oven mitt and hit it sharply, on its back-plate, against a heavy wooden block.

You would then have to remove the back-plate again and the unseated bearing will be able to fall out.