just did the rear wheel bearings on my '72cb750 the other night, this might help: i removed the cush drive/sprocket carrier, then pried the inner bearing spacer over. this gives access to the back of the bearing you're removing. i drove both out using a long drift, they're stubborn - so good luck. other members may have additional methods, but this has worked for me in the past. it may help to have an exploded view of the wheel, available at cmsnl.com
bobp