Hi Paul, that sounds like a good deal on the K100. I gather it is a
plain k100 and not an RS? If you like riding when its
cold, the K will handle it fine.
One of the problems on those is excessive heat, so that might
work to your advantage
I rode airheads for 15 years
when I got an 85 k100rs back in '97. Completely reliable
for the 34k I rode it, I never had to use a battery charger on it,
never failed to start. If I hadn't kept crashing it I might still
be riding it.
You've heard about the splines, no big deal really; mine looked like
new at 54k when i "retired" it. You've read that the tank and sidepanels
as well as camshafts are different on it. The only other gotcha
is the water\oil pump impeller and shaft, which is secured with a nut instead of a bolt
as on later years. This will break off and a new shaft is a couple hundred bucks.
The old shaft could be tapped and threaded too, or a new pump is lttle more
than the shaft itself.