Tachometer driven gear assembly designed for use with GN125 GS125 EN125 models.This cylinder head speed line worm gear is constructed from aluminum to support under demanding conditions.The design integrates a machined speed to help improve transmission for accurate tachometer readings.Engineered to endure operating temperatures up to 105℃ without degradation, the component maintains performance integrity over time.Its construction allows for direct replacement with existing units, compatibility with the motorcycle's speed line system.Installation is straightforward and does not require specialized tools, making it suitable for standard maintenance or upgrade procedures.The compact profile supports integration without altering the setup's balance or aesthetics.