Hi from over here in the UK. Found the site yesterday and so far I've found some good info, nice work!
I got myself an '88 K100RT about a month back with 43,000 miles on it. It's had 8 previous owners so I'm working my way through it putting stuff right, but on the whole it's in good mechanical order. Mostly lost, broken or incorrectly fitted stuff, grommets, spacers, clips, panels etc, that sort of thing. I guess with that many previous owners stuff gets lost... Paint isn't the best with lots of chips and scratches but that doesn't particularly bother me. No oil leaks, and doesn't seem to burn any either, sweet!
It's a bit warm to ride on hot days, be nice when the weather starts to turn though. Very smooth and with a fair amount of get up and go when needed. Not most peoples idea of a nice bike but I love it.
Simon.