Yamaha still makes the TW200.
It’s ultra slow, but will go anywhere. It suit the kind of riding I do. Finding “trails”, and plucking down them. I put it in the back of truck between trails, I would not want to ride one at high speeds. It’s also like a “lego” bike. Since it has remained largely unchanged for 30 years (1987-present), the after market is massive. Parts from a 2014 will fit on a 1994.
It’s the 2 wheeled equivalent of an antique tractor.