Elevate your off-road experience with the BUCCI RACING HD UPGRADED GEARBOX for YX 140/160/170, exclusively available at 7-ONE Racing. With revised spacing, the ratio in each gear has been optimized so that the engine never drops in revs, ensuring seamless performance and superior control. The gearbox comes complete with spacers and shims, making installation in your engine straightforward and hassle-free. Trust in our 15 years of expertise in Motocross, Pit Bikes, and Servicing to deliver top-notch products and support. Enhance your ride with the precision and durability you expect from a dedicated off-road parts specialist.