I've done this ride in past years and alot guys tie their street-bike plate on, throw on a rear-view mirror, and don't have any problems. I'm not saying it's right but it makes sense to look legal ? My WR isn't technically street legal, but my DT400 plate makes it all look legit ! A lot of locals jump in on the trails and tag along for free. The AMA does look over each bike at the start for head-light , tail-light , plate , mirror. These events are not races .... they are "rides". (and they are a blast) If your not a C+ , B rider .... your not gonna make the A-lines.