Thank you everyone for the advise. I have cleaned the carb thoroughly and actually replaced the main jet. So I am doubting that the carb is the problem. It was good to hear that it could be the variators. This bikes variators do not fluctuate like my PA50II. I thought that could of been because it is the 20 mph version. I have heard the variators are different. They look identical but the one on the crankshaft of the PA50I does not put any more tension on the belt.