Flying Horse 2-Stroke/4-Stroke Motorized Bicycle Engine Throttle Grip Handle Set &ndash; Gas Bike Throttle Handle Grip Replacement The Throttle Grip Handle Set fits over your handle bars to get your 2-stroke or 4-stroke motorized bike moving down the road Installation is easy, but requires some slight modification. You will need to drill a small hole in to the handlebars for the pin in the handle set. Slip the grips over your bars, mount your cable and retainer (or kill switch) and you're ready to ride Note: Throttle grips do not come with a grip retainer, kill switch, or throttle cable