From MopedWiki

Made by the Yamaha company. 100 000 were created 1978-1983. The moped is very common in Northen Europe. The first one came 1978 and production ended 1996. I were the most common moped in the Yamaha DT series. It has the same frame as Yamaha DT80MX so it can handle a 70cc and the frame won't get bent of it.

See Yamaha DT