Kyosho Mini-Z MR-03 AWD 21T Alloy Motor Pinion MZA021T by GPM  [MZA021T]

Overview of the 21T alloy pinion

This single-piece alloy motor pinion is provided as a 1pc set for Kyosho Mini-Z AWD cars that run the MR-03 AWD motor layout, and it comes with the mounting screw included. With 21 teeth it matches common Mini-Z pinion choices and offers a direct replacement for worn gears or when swapping ratios to refine handling.

Fitting is straightforward: place the pinion on the motor shaft, tighten the supplied screw and then verify mesh and axial alignment to avoid binding. The part is for RC miniature models only, not for any full-size application.

From a setup viewpoint, moving to or from a 21T pinion changes the final drive and can be combined with different spur sizes to tune throttle response and peak speed for short indoor tracks. Regularly check the tooth faces and the screw for tightness as part of maintenance.