The YBR125 2006 model motorcycle small tooth has an inner hole of Φ6mm and an installation hole position that perfectly matches the 2006 model YBR125 crankshaft. It can directly replace the original small tooth without adjusting the installation position. The sprocket is made of quenched steel, with high tooth surface hardness and wear resistance, making it suitable for the transmission conditions of high-frequency chain meshing. The meshing clearance between the tooth profile and the chain is precise, ensuring no jamming or abnormal noise during transmission and guaranteeing the efficiency of power transmission. Just align the crankshaft head fixing screws. After installation, it will naturally mesh with the chain. The operation is simple and efficient.