So I have a problem. I picked up a 78 sears free spirit for free about 6 years ago. we cleaned the carb and it ran for a day. after that day i put it away and just recently tried it again but it didn't work. i tried the carb again and that didn't work. i now have replaced the spark plug and that didn't work. so I am lost... i get on it and get a running start and hold in the clutch and as long as i have my hand on the clutch it sounds like it's turning over yet there is no power and the only reason it is turning over is because the moped is moving and as soon as it stops moving there's nothing. PLEASE HELP ME!!!!