This KM153 alloy middle gear is supplied as 1 pcs as an aftermarket replacement for Kyosho motorcycle gearboxes. It occupies the driveline position between the motor pinion and spur gear, transferring torque while offering better wear characteristics than stock materials.
Fitting notes: set correct gear mesh and axial alignment, reuse the original shaft and retainers, and check clearances to bearings and the spur gear before final assembly. Rotate the drivetrain gently while making mesh adjustments to ensure correct seating.
Maintenance tips: keep mating surfaces lightly greased, monitor bearing fit and endplay, and verify motor and ESC settings after installation. Take care not to overtighten mounting screws to avoid stress concentration in the alloy or gearbox housing.
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