I removed the swing arm bearings before I had the swing arm powder coated. The swing arm bearings are the same sealed bearings used on the 1983 R100RS that I previously rebuilt, so the procedure for replacing them on the R80ST is the same. In this document I link to the previous documentation for the 1983 R100RS as appropriate.
Here is a short video summarizing the work.
VIDEO: 1983 BMW R80ST Replace Swing Arm Bearings
Earlier versions of the airhead swing arm used traditional bearings with a separate inner and outer race. I show how to replace that style swing arm bearing here.