Recently my 1984 K100RS has been behaving a little poorly, first I thought it was a flat battery as it wouldn't start and the instrument lights were very dim.
However it bump started easily and didn't give any more problems for a while, then it did it again and after checking the battery I noticed one of the terminal bolts was a little loose, then fine again for another week...
Yesterday it did it again and I knew the battery and the terminals were fine even though it was giving all the symptoms of a flat battery, clicking relay and no or dull instrument lights, bumped it in 3rd again, (this time on the flat, best if you take off the left pannier off first).
At home I thought about cleaning the ignition switch but then decided to pull the starter from my other k, which was without battery, and try that, started fine!
Now this is one of those things i've been avoiding but in the end it only took about an hour and very easy to do, here are a few hints.
For the rest see these photos, keep pressing next:http://groups.msn.com/2wheelsgood/shoebox.msnw?action=ShowPhoto&PhotoID=110