http://articles.superhunky.com/4/126
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That's my exact bike. Obviously I've got some dings and missing side covers though. Those K0 side covers are reproduction items only ($200). I'm going to be doing some patch welding on the exhaust to patch up a hole since new exhausts can be $2,000 for a pair. Throttle cables are impossible to find (custom made only) for K0s, while the later models are easy to find.
They are very special bikes. I rode mine into work last week. It was fun. Mine needs new tires; you felt everything on the road. For a tall guy like me, they are a bit cramped.
Plenty of power I thought. Nice unmistakable throaty sound.
It's basically a novelty bike, but a very cool one at that. No turn signals. The only thing I don't like about K0s is the big honking side covers. I think they look better without, with just the black air box covers. Already a $200 savings from a stylistic choice.
As far as off roading (what they are built for) they are extremely outdated and heavy. At best, they kick-ass campground bike. I don't think I'd be doing anything serious on it...they do have some weight.