From what I have read about them, its one of the things that has be done when it is shipped to you, from basic engine knowledge, it should be a hose running from the tank to the carberator. which should be under the tank. I havent got one of these bikes yet, hoping to by income tax refund time. and still trying to find a reputable dealer to order one from, if you dont mind me asking where did you get yours from? email me back please at [email protected]