Most excellent acquisition. I had two '85s with VIN numbers only 79 units apart, imagine the chances of that, halfway around the world and decades later.
Rode the first one for 12 years. The second one, acquired late, had been sitting a long time. I cleaned it up and went for a ride with the wife. It caught fire because of a rust-out on the left side tank low point. I dumped the bike in the middle of the intersection and beat it out with my gloves. As it happens, dumping the bike with the leak side up was the best possible thing that could have been done, because after that the leak did not further contribute to the conflagration. A few new parts from ebay and it was a runner again, but I sold both bikes after I got a 2010 K1300GT. The K100RS was nice and took me many places but the K13 is as an ICBM compared to a horse and buggy.
THEREFORE make sure your tank does not leak at that point!