I think the crown bearing in the final drive is on the way out.
Disaster!
I'm getting lotsa vibes through the bars and footrests at around 50mph. The breather is leaking oil and there's a little play in the back wheel....
The rear shock I can live with but this is something much more serious.
The bearing is peculiar to this model, and only fitted to BMW's for a few years.
No chance of finding one in Russia. I limp into the nearest big town and hole up in a tourist hotel whilst trying to figure out what to do....