YBR125 motorcycle starting disc gear, gear number, axle hole size and the original car starting mechanism completely match, directly replace the original starting disc without adjusting the meshing gap; The gear tooth surface adopts quenching treatment, high wear resistance, anti-tooth damage, to ensure the stable meshing when starting; Copper bushing is built into the shaft hole to reduce the friction loss with the shaft and extend the service life of the starting plate; The gear body is made of wear-resistant alloy, which is resistant to impact and deformation, and ADAPTS to the instantaneous force when starting. After aligning the starting shaft, it can engage with the starting clutch, which is easy to operate.