Okay, found the starter and successfully removed and disassembled it.
Has anyone ever found new brushes to replace worn/non-existant ones? (hmmm, can't believe they were completely worn away with only 4000 miles on the bike. Just wondering if they were just old and brittle and broke up after sitting for 25 years.
A quick search at my favorite suppliers and I find that they don't even bother to list part numbers for the brushes.
It is a Kokusan starter. everything else seems to be in good condition, I hate to have to buy a whole new starter.