I paid 1200 for my 91 KDX200, if the bike runs good then sounds like a pretty good deal, i'd ask when the last time a top end was done, when the bearings were last lubed, if he's messed around with the jetting, stuff like that, if the plastics are kinda rough then he may have dumped it many times but that's not a huge concern, just look at the frame to see if there is any dents or big marks, the seat, well mine is starting to rip too right up by the gas tank, no biggie, and yea mine starts first or second kick, if his does too then that's a good sign, as for the coolant mine no longer leaks since i removed the rear resovior, lol, if you do get the bike throw a pipe on it, remove the air box cover and put in some boysen power reeds, this makes a hell of a difference, good luck