Embla EB Upgrade: 12T Pinion for 3mm Shaft - HI0304127 by Hirobo  [HI0304127]

Pinion Specifications and Fit

This is a replacement pinion for the Hirobo Embla EB range, listed as HI0304127. It offers a 12-tooth profile that meshes with the helicopter's main spur gear and mounts on a 3mm motor shaft. It is intended for RC helicopter drivetrain use.

For models using a 3mm motor shaft, installation is straightforward: position the pinion on the shaft and secure using the model's existing fastener. Always set gear mesh carefully and confirm alignment before the first flight to prevent premature wear and avoid contact with nearby parts.

Tuning guidance: switching to this 12T pinion will change the gear ratio, affecting motor RPM and torque at the main gear. After changing pinions, check mesh, clearances, and system response. Routine inspection and light lubrication of the teeth will prolong smooth engagement.