Flying Horse 2-Stroke/4-Stroke Gas Powered Motorized Bicycle Engine Vitta Fuel Line &ndash; Gas Bike Fuel Hose Replacement The Vitta Fuel Line helps deliver fuel from the gas tank to the carburetor of any 2-stroke or 4-stroke 48cc, 49cc, or 66/80cc motorized bicycle engine Installation is a breeze: simply slide one end of the fuel line over the fuel valve filter and the other to the gas jet valve on your carburetor. If needed, use hose clamps to tie the fuel line down to the jet, and you're ready to ride Note: If you're using a fuel filter you will need to install it in the center of the fuel line, which will require you to cut the fuel line in half