Have a slight problem. Had flat tire change back tire out. put both chains back on went to go pedal to get it started release the clutch and it almost bucked me off the handlebars knock my nuts on the bar when I disengaged the clutch. the bike moves.. as soon as I undo the clutch to get the motor going it locks up any suggestions haven't had any issues until now. It's only 2 months old the motor..zeda 80.. Damien any suggestions.