Yokomo YOKPG6438 64-Pitch 38T Pinion Gear for Electric RC Motor Gearing  [YOKPG6438]

64-Pitch 38T Pinion Gear Overview

The Yokomo YOKPG6438 is a 64-pitch, 38-tooth pinion gear intended for electric RC model motor gearing. As an RC-scale accessory it serves the basic role of changing final drive ratios and refining how the drivetrain responds under different load and track conditions.

Use this pinion where system geometry and gearbox specs call for a 64-pitch gear; it is not tied to a single chassis or motor type. Before installation confirm the pinion tooth count and pitch match the spur and gearbox, and verify the motor shaft diameter and set screw style to ensure proper fit without forcing parts.

Installation notes: mount the pinion onto the motor shaft with correct axial position, set a proper gear mesh to avoid premature wear, and secure fasteners to manufacturer torque recommendations. After initial fitting, rotate the drivetrain by hand to verify smooth engagement and check for binding or excessive backlash before powered runs.

Tuning role: swapping to a 38T pinion shifts the gear ratio toward taller gearing compared with smaller pinions, which affects acceleration and top speed balance depending on the spur. Use incremental changes and test runs to dial in performance rather than large leaps in tooth count.