Well i have a 49cc pocketbike which have been sitting for around 6months.... Well now im starting it back up and once i do it idle it and such, but once i get it too run i have to keep playing with the throttle or else it will shut off....keep it mind its the same gas and alot of white smoke is going out the pipe which it rarely does so im geussing its the gas/oil?? thats a lil bit too old but i did add some new gas/oil but its not all drained out yet..