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

Embla EB 12T Pinion Overview

This replacement pinion is specified for the Hirobo Embla EB line and carries the model number HI0304127. It features a 12-tooth profile sized to engage the main spur gear while fitting a 3mm motor shaft. It is intended as an RC helicopter drivetrain component.

Fitment and installation are simple for models using a 3mm shaft: slide the pinion onto the shaft and secure it with the existing fastener or set screw. Always set and verify gear mesh and alignment before the first run to avoid premature wear and to prevent contact with nearby parts.

Tuning notes: installing this 12T pinion changes the overall gear ratio and will alter motor RPM and torque delivered to the main gear. After swapping pinions, confirm pinion-to-spur mesh, check clearances, and verify servo and ESC responses. Regular inspections and light lubrication of the gear teeth help maintain smooth engagement.