This single alloy motor pinion is supplied as a 1pc set for Kyosho Mini-Z cars running the MR-03 AWD motor configuration and includes the mounting screw. With 21 teeth it matches common Mini-Z pinion sizes, providing a straightforward replacement when the original is worn or when changing ratios during setup.
Fitting involves placing the pinion on the motor shaft and securing it with the supplied screw, then checking gear mesh and axial alignment to ensure quiet, reliable engagement with the spur gear. This is an RC-scale part and not intended for full-size use.
On the track, swapping to a 21T pinion changes the final drive and can be used with different spur sizes to tune throttle response and top speed for specific indoor layouts. As part of routine checks, inspect tooth wear and the securing screw tightness regularly.
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