Interceptor398 is right about the oil injection...It might be running great now, but without lubing the crank bearings, it won't last long.
If the crank seals haven't been changed recently, its a must on these old sleds.
Be careful, these Kawasaki's are addictive. You think you're just buying one cool old sled, and next thing you know you've got 12 of them and a basement full of parts. And find yourself looking behind barns and garages while driving around the countryside in an attempt to feed your addiction. lol