Sounds like a deal i paid 1000 for my 86' with no mods. But i will tell you to look it over the swinger is not the only place that the 85-86' racers crack, well they all do but the first 2 years were the worst. The wall thickness of the tube that suzuki used on the frames was very thin, so stress cracks can show up at any of the welds. So if you ride hard just inspect the frame often and pay atention around the upper shock mount, and the a-arm mounts. This is ware i have had to repair my first frame sevrly times. I spoke with guy from up state NY, at an ice race who use to race an 85 on the ice and flat tracks he sead that he put a full frame skid plate on his race quad to help stiffin up the frame and it helped prevent some of the cracking. But if your 85 has some good suspension under it that will help a lot. Thats just my 2 cents hope it helped.
86' trx 250r
86' lt250r quadracer