I have a 1966 here in Canada - it is impossible to get parts for it here as they only made it here for 2 years. But they have been making it in Japan ever since.
It's built and advertised under the business department. It comes in diff models from 50 to 90 cc. It is also a scooter.
If you want to see it go to google.com and type in "yamaha mate".
I love mine.
Ps. Everything Japan is great especially their history and antiques.