To get the inner bearing out, or the outer one, you have to use a propane torch. Remove everything from the engine that you can, and clean off any excess dirt or oil off of the outside. Next, put the motor block in a vice holding the two motor mount tabs on the motor so you don't have to touch it. Next, take a propane torch and heat the area around the outside of the inner bearing all the way around. Make sure to get it good and hot. Heating the case will cause the metal to expand and the bearing to be removable.

Next, some people use a screw driver, but if you heat it enough, you can take the hot motor out of the vice with a thick rag, and bang it on the bench with the bearing facing downwards (so, bang it as if you were banging on the back plate). This should knock the bearing out and you'll be left with a motor ready to take your new bearing.

Of course, heat up the block in the same fashion to get the new bearing in there too.

I've done this about 3 times to engines in the past and it works everytime. Hope this helps!