Flying Horse 2-Stroke/4-Stroke Motorized Bicycle Throttle Cable &ndash; Gas Bike Throttle Cable Replacement The Throttle Cable pulls the jet needle in the carburetor of any 2-stroke or 4-stroke bike engine kit in order to give the engine fuel Installation is simple: install the non-beaded end in to the carburetor. Once installed, screw the threaded end of the carburetor in to the cable retainer (older engines have a metal retainer housing, newer engines have a kill switch that acts as the housing). Install the beaded end in to your throttle handle, install the handle in to the retainer, install the assembly on your handlebars, and you're ready to ride