dickim, I suggest you look for a used Yamaha TY250 or 350, or whatever was common in your neck of the woods. Nice ones are rather dear these days though.
They are simple, decent (the TY350 was state of the art in 1985), and parts are easy to come by. If you can find a Honda Reflex TLR200, they are bulletproof, super easy to ride and rather awful trials bikes in stock trim. But just an exhaust system change improves things dramatically.
9fingers