All those 80's Suzuki's are junk in my experience with the exception of the 185. Quadsport/Quadrunner 230's are total garbage, that 250 is garbage, and the Quadracers are garbage. I do know two guys (from this site) that have beautiful Quadracer 500's, but they seem to be the exception. Every Quadracer that rode with me when I was a kid got towed in more than it got ridden. I owned a mint 86 Quadrunner 230. This thing was beautiful, and it sucked. They're slow, they don't steer, and they suck to work on. You don't have to take my advice, but if you do buy it I'd like to know how it goes.
P.S.- Sorry to Matt and Shawn. I really do like your quads, they are mint!
85 Tri-Zinger 60
85 ATC250SX
86 ATC250SX
87 ATC250SX
02 XR650L conversion
84 ATC 480R