This thread should go under racing. Here's the link that gives a rough idea of what class this should go in. That bike is one of those "where does it go type bikes". This page will hopefully help you but what the cut off date is, when was the first RD 200 made, is yours an air cooled model, is an RD200 something that they will think is too fast for that class? These are all the questions that are not covered on this page and you'll probably have to email someone about. I'm pretty sure you can run it in Ultra Lightweight. I think the MT will dominate that calss this year so I don't they would say you couldn't run it.