1987 YAMAHA QT50 YAMAHAHOPPER, LESS THAN 1000 MILES!!! You would never guess this Yamahahopper is 30 years old. It is a one owner moped and never been ridden by a kid. This QT50 is probably one of the nicest around. That is if there are even any around anywhere. If you like the old school mopeds and don't like the price for new ones, you might want to check this one out.