Hey guys. I have already upgraded the starter gear assembly and side cover on my 1987. But After a 45-minute ride, I began hearing some rattling from the starter cover when revving. It sounds like a small part causing the rattle. I made up a new gasket and will open it up tomorrow and dig deeper.
I have also noticed a loud rattle sound that lasts about 2 seconds after I release te starter button each morning when I ride.

I bought a newer cover and replaced all the gear.s I'll open it up today and report back. I have been making my own gaskets for a while and I wonder if the gasket thickness being off may have contributed.

Update. Removed the cover and replaced the 2 shims on the second starter gear. The rattle is gone—hopefully no permanent damage.

One other thing, this bike has always had a little rattle for 1 or 2 seconds after starting in the starter area which is still present. Soes anyone else have this ?