Broke out my 81 Yamaha QT50 (Yamahopper) I have it hopped up. 60cc, bigger carb., no air box with Uni filter, Goes 35 to 40 mph on the flats. Got it kick started, and rode it around. Got to go back in the carb and drop the main one size. I swear the jetting changes with 20 degrees of temp change.
Here's a Youtube of some QT's set up like mine: https://www.youtube.com/watch?v=RKlrygX31Fo
Here's a Youtube of some QT's set up like mine: https://www.youtube.com/watch?v=RKlrygX31Fo