The main differences that I can think off right is that the 85 says 350X on the seat and the 86 says ATC. The 85 has a different chain adjuster and therefore the carrier is slightly different. The 85 has fins on the front brake caliper, the 86 does not. The 86 has a black top tripple clamp and the 85 is polished. The 85 has red fenders and the 86 has white. The 86 says 350X on the rear fenders and acros the front fender. The clutch cable holder on the 86 is on the left and the holder on the 85 is on the right. The cam chain tensioner/adjuster is different, I think it is smaller on the 86. There are some other differences, I am sure, but I can't think right off hand. I had a list made out somewhere, I'll have to find it one day.
ATC350X,ATC70,1991 RM 250,XR500,TM400,TS400,Foreman400 4X4,Polaris 425 Magnum,ATC 90, 1982 175,1973 Honda Trail 90,1980 CR80,1981 CR80,