Yesterday i was riding and everything was working perfectly. All of a sudden it stopped working and it sputtered and stalled. I cleaned the carb, air intake, and spark plug last night and left it alone. It started first kick today and ran good for about 15 seconds. It then started slowing down and sputtering and barely has any power to drive. Also it will stall unless you keep pumping the throttle. It wont stay on for long even if you just hold the throttle down.