So i bought my kids this mini atv(from what i understand it is a taotao150 frame with a 49cc kazuma engine). it has no power, if i put it on a jackstand it seems to go thru the whole powerband. but as soon as my son gets on it there is barely enough power to make it move.I tried taking the exhaust off and that didnt seem to make any difference. someone help! Also, anyone know the gear layout of this motor and stock sprockets?(currently running a 12t in the front and 37t in the rear) any help is appreciated.