A. This engine part designed for motorcycles is specifically crafted for off-road motorcycles, all-terrain vehicles, go-karts, etc. Its model is 428, and there are various specifications available. It comes with screw accessories, and there are small sprocket chain gears ranging from 10T to 19T to choose from, such as models like 428 - 10T (small hole) and 428 - 11T (small hole). B. In terms of design, careful consideration has been given to ensure a perfect fit with motorcycles and guarantee the compatibility of the support relationship, providing strong support for the normal operation and performance improvement of the vehicle. C. Whether on the rough terrain of off-road areas, the soft sand where all-terrain vehicles gallop, or the go-kart track, it can function stably and assist the vehicle in demonstrating good performance. D. It is a good choice for enhancing the power and transmission efficiency of motorcycles and other vehicles.