Not sure if they're all like this, but there really is no clutch per se. The cable that's attached to the squeeze bail goes to a spring that literally pivots the whole transmission assembly until the belt is tight on the pulley, thus engaging the drive. Pull the cover off the tranny and squeeze the drive bail and see if the belt it tightening on the pulley. While you're there, manually spin the pulley clockwise and see if the wheels turn. If they do it'll be slow. With the cover off you should be able to see any external issues pronto.