Flying Horse 2-Stroke/4-Stroke Motorized Bicycle Engine Throttle Grip and Kill Switch Combo &ndash; Gas Bike Throttle and Kill Switch Assembly This Throttle Grip and Kill Switch Combo is best for bicycle engine kit builds, and is compatible with 2-stroke engines Installation can be a little challenging: you'll need to drill a hole in to your handlebars to fit the throttle handle's mounting pin. Then you align insert the throttle cable in to the kill switch, fasten them around the throttle grip, and you're ready to ride Includes both throttle grips (stationary and the twist grip) and a kill switch. You will need your own throttle cable