Ultra-Hard 31T Pinion Gear for 64-Pitch Systems - Yokomo YOKPG6431  [YOKPG6431]

Durability-Focused 31T Pinion Details

The Yokomo YOKPG6431 is a 31T, 64-pitch pinion intended as a motor pinion replacement in RC models. The ultra-hard designation refers to a hardened surface finish meant to extend component life while keeping accurate tooth profiles for reliable mesh.

Install with a matching 64-pitch spur gear and confirm correct tooth count, bore diameter and shaft fit prior to assembly. Do not force the part into place; correct seating and alignment reduce wear and enhance longevity.

Assembly advice: fit the pinion square to the motor shaft, secure using the original set screw or keyed retainer, and set gear mesh via a thin paper or feeler gauge to prevent binding. After initial runs, recheck fastener tightness and ensure free rotation.

Role in tuning: changing the pinion tooth count modifies final drive ratio and the motor load. A 31T pinion changes RPM relative to the spur gear used; make incremental adjustments to dial in acceleration or top speed while watching motor temperatures and drivetrain noise levels.