I recently bought a 1999 Whizzer and spent the weekend getting it running, the issue is I don't fully understand the tension release/clutch (the leaver on the left). I am able to start the bike just fine but pulling that lever so that I can set the bike down without it launching off takes a ton of force. I have to put both hands on the lever just to fully pull it. Is this a fixable problem and does anyone know what to do to make it easier?