Kartwheel68
Husqvarna
Pro Class
I can see on line if someone around here wants to travel to virginia there are quite a few such races and what appears to be lots of classes. Not sure how I ran across the results from three vintage classes run at a NETRA Junior enduro. Thre was a class that allowed disc brake, four entered it. If there is a rulebook for these local things which may or may not be running the rules you speak of they (rules for local stuff) are not or I failed to find them on line where I looked. A lot of times the rules, the finer points take a protest, and that takes a vicotry. Ever see any minors that could not touch the ground with both feet and start and stop on command?
There may be local events that have vintage classes but the only national vintage racing organization is AHRMA and under AHRMA rules what bill wants to do is specifically not allowed.