- 1). Purchase a bicycle with a V-shaped frame, or alternatively, build one up from components that suit your interests. Give your bicycle a tune-up before attaching the engine kit and make sure that all of the parts of your bike are in functional condition. Avoid a frame made with unusual design, or mountain bikes with rear shocks, as these can potentially impede the fit of the engine.
- 2). Research the available engine kits and choose one according to your needs. Common two-stroke engines will bring you up to speeds of 40 miles per hour; however, some are designed for endurance, while others are built for speed and acceleration. Consider the reason for needing an engine and let those needs dictate the type of engine you purchase.
- 3). Purchase the engine kit you decide you want from either a local bike shop or an online dealership. Purchasing a kit from a local shop will save you money on shipping fees. Remove all of the components and engine from the kit box and arrange them in an orderly and accessible manner. Read the step-by-step plans and user manual provided with the engine kit.
- 4). Mount the engine to the seat tube on the bike frame using the clamps or mounting braces as provided with your engine kit. Mount the gas tank to the frame in the same manner as the engine. Depending on the kit you purchased, the gas tank will be mounted on either the top tube or down tube of the frame. Adjust both the engine and gas tank as necessary to allow for sufficient pedal clearance.
- 5). Install the throttle and kill switch to the right and left side of your handle bars, respectively. This process is akin to mounting brake levers. Use a screwdriver to mount them both into place and adjust them as needed until they are in a comfortable position.
- 6). Attach the corresponding cables to the throttle and kill switch and then connect them to the engine itself. Use electrical tape to secure the cables to the frame of your bicycle, thus prohibiting unnecessary movement that can impede your cycling.
- 7). Attach the engine sprocket to the axle on the non-drive-side of your rear wheel. This is opposite the side that is already equipped with a sprocket or freewheel. Place the drive chain over the engine sprocket and attach it to the engine. Adjust your rear wheel as necessary to keep the drive chain taught. If it is too loose, either move the rear wheel back slightly in the frame dropouts, or remove links from the drive chain using a chain tool.
- 8). Add approximately one gallon of fuel (as is most common) to your gas tank. Take your gas bike out to the streets for a test ride and break it in. Most engine kits require a 300-mile break-in period, so at first, do not push the engine to its limits.
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