Maybe you already have this but if it helps here is a copy of the AMA classes. Note HS is first but I am certain they allow up to 84 in HS as long as there is no disc brake. On MX on pages 2 and 3 the cutoff for PV is basically that - no disc brakes. Then the class from 82 on Kawi, 84 on Honda, and 85 on a Suz/Yam up to 98 would be non current. As mentioned most of us PV guys ride 83 and 84's but don't want to run against a 98. It sounds like you guys are open so maybe you can wait and see what shows up as MX is not until the afternoon. It could be real simple like 77 and older V, 78 to 83/84, PV, up to 98 NC. Only have 125 and 250 to open classes with under 30, 31 to 49, and 50+. Looking forward to it no matter what.