YBR125 motorcycle starting disc, the number of gear teeth, axle hole size and the original car starting mechanism completely match, directly replace the original starting disc without adjusting the meshing gap; Built-in one-way locking mechanism, power transfer when starting, automatic separation after engine running, avoid reverse drag damage start motor; Tooth surface quenching + copper bushing, not only ensure the wear resistance of gear meshing, but also reduce the friction loss of shaft, prolong the life of components; The gear body is made of alloy material, which is resistant to impact and deformation, and is suitable for the instantaneous large torque force when starting. After aligning the starting shaft, it can engage with the gear of the starting motor, and the operation is simple and efficient.