This aftermarket aluminium main gear is an RC-scale replacement component intended for Kyosho motorcycle models, supplied as 1 pcs. It is designed for installation in compact motorcycle drivetrains where the main or spur gear requires service, replacement, or ratio changes during tuning.
The alloy construction maintains consistent tooth geometry and offers improved resistance to light wear compared with many plastic gears, helping to preserve correct mesh and drivetrain efficiency in model transmissions.
Fitting guidance: confirm correct gear mesh and axial alignment with the motor pinion and gearbox output, verify secure seating on the shaft and fasten with the original retaining hardware, then rotate the drivetrain by hand to ensure smooth engagement before powering. Follow the bearing and mounting recommendations in the vehicle service documentation.