N C Powertrain, LLC has developed a compact and powerful mechanical device for motorbikes. The device, based on a belt-driven supercharger, bolts onto the vehicle and improves most common 50cc-125cc four-stroke single-cylinder engines. The supercharger greatly improves the engine's acceleration capabilities, making the motorbike accelerate twice as fast as before the supercharger installation. A two-minute video: http://youtu.be/PBuKM05wC-0