What is a 1984 Yamaha IT 200 worth?

Well it Depends on the condition the bike is in. I have one and it needs a lot of work and i got it for $400, but it wasn't advertised. They usually go for about $400 - $1500 depending on the condition, but if it is an advertised bike then it may go for more because someone might pay more. Whether you are selling it, try to advertise it on Kijiji.com you could get a lot more for it. If you are buying, try to get it local from someone who just has a "for sale" sign on it. http://www.kijiji.com or for Canada http://www.kijiji.ca