YBR125 motorcycle magneto rotor, size (center hole 24.5mm, friction surface diameter 94.5mm) and YBR125 magneto stator exactly match, directly replace the original rotor, no need to adjust the generating mechanism; Built-in high performance permanent magnet, stable magnetic energy density, ensure stable power output when the engine is running, adapt to the vehicle electrical power supply requirements; The shell is made of die-cast aluminum alloy, resistant to deformation and wear, suitable for high speed and high vibration of the engine. It can be tightened by aligning the crankshaft interface, and the matching gap with the stator is preset by the factory, so there is no need to adjust the power generation parameters after installation; Accurate magnetic circuit design reduces energy loss, stable power generation even at low speed, and ensure the normal operation of lighting, starting and other electrical functions.