Hirobo HI0304127 EMBLA EB Pinion Gear 12T / 3mm Shaft  [HI0304127]

Embla EB Pinion Gear 12T

This is a replacement pinion gear for the Hirobo Embla EB series, listed as HI0304127. The part provides a 12-tooth pinion profile designed to engage the model's main spur gear while mounting on a 3mm motor shaft. It is intended solely as an RC-scale helicopter drivetrain component.

Fit and installation are straightforward for models that use a 3mm motor shaft: slide the pinion onto the shaft and secure it using the model's existing fastening method. Check gear mesh and alignment before first run to prevent premature wear and avoid interference with adjacent components.

Tuning notes: changing to this 12T pinion alters the gear ratio and affects motor RPM and torque at the main gear. When swapping pinions, verify pinion-to-spur mesh, confirm clearance, and recheck servo and ESC responses after adjustments. Regular inspection and light lubrication of gear teeth can help maintain smooth engagement.