The Arrowmax unit is offered as an aftermarket 18-tooth motor pinion tailored for the Mugen MTX-5 chassis, manufactured from 7075 hard aluminium. It interfaces directly with the motor output to shift gearing, which in turn alters acceleration, maximum speed and electrical load on the powertrain.
Compatibility focuses on MTX-5 installations; when replacing the pinion make sure the spur gear mesh is correct, verify the motor shaft dimensions and keying, and set backlash in line with the chassis maker's guidance. Use the typical thread locking or retention techniques used in RC servicing to hold the pinion securely on the motor shaft.
Tuning guidance: fitting an 18T pinion typically increases top speed versus smaller options while raising load through the motor and ESC. Consider motor timing, ESC setup and battery choice so the pinion selection supports your desired trade-off between punch and sustained pace on track or during club runs.
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