Don't beat them out, you may damage the arm.
Get a 2.5" long 1/4-20 bolt (or some allthread rod), 2 large washers and a nut, and a small and large 3/8" drive socket. Put the large socket on the INSIDE of the arm: this is the receiving socket. The small one goes on the outside of the arm. Grease the bolt, and use a couple of wrenches or wrench and ratchet, and press it out, to the inside. Install from the inside, too, and grease well when you do. Be careful when installing to NOT press on the rubber: use the washer(s) to make sure you're pressing on the shell of the new bushing.
I have a post around here somewhere that describes the whole sequence, picture, tools and all. Take a search around for it. It was a 750 arm, but all SOHC4 arms are similar.