![]() The exact method of turning on the fuel supply may vary from motorcycle to motorcycle. You will probably open a small faucet under the left side of your fuel tank called a petcock. ![]() In the motorcycle world, nearly every carburetor is a sidedraft. So a downdraft carb, like you might find on a V8 muscle car, has air that enters from the top and moves down, picking up the fuel, where they travel together into the manifold and then on to the combustion chamber. ![]() So, at idle, when the throttle is almost closed, there is a strong vacuum downstream of the throttle plate. ![]() The rising needle, with it’s tapered shape, exposes an ever-greater amount of the needle jet orifice to the venturi, allowing an increasing amount of the fuel to rise from the main jet. ![]()
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