Hirobo HI0304169 EMBLA EB Pinion Gear 14T - motor pinion for EMBLA series helicopters  [HI0304169]

EMBLA EB pinion gear overview

This is an RC-scale replacement pinion for the EMBLA EB helicopter range. The HI0304169 is identified as a 14T motor pinion intended to restore or adjust gear mesh between the motor and the spur gear in EMBLA EB drivetrains.

Use this part when replacing a worn pinion or when changing gear ratios for tuning. The description focuses on fit and function: it serves as the direct mating gear on the motor shaft and affects mesh, backlash, and overall drivetrain feel.

Installation notes: remove the motor from its mount as needed to access the motor shaft, confirm the motor shaft diameter and set screw alignment, then secure the pinion at the required axial position to obtain correct mesh with the spur gear. Check mesh under slow rotation before flight and re-tighten set screws after a short test run.

Tuning role: changing to this 14T pinion alters the effective gear ratio and can be used to fine-tune head speed and tail/rotor input balance when combined with other drivetrain adjustments. Always verify clearance with the gearbox and ensure bearings and spur gear are in good condition to avoid premature wear.