Embla EB 15T Motor Pinion - HI0304170 by Hirobo  [HI0304170]

Embla EB Motor Pinion Overview

This RC replacement pinion is made for Embla EB-series helicopters and is identified as Hirobo model HI0304170 with a 15T tooth count, suitable where a 15-tooth motor pinion is required.

As the motor pinion, the gear transfers torque from the motor into the main gear train and directly affects gear ratio and rotor response. Selecting the correct tooth count is a common tuning move to influence head speed and tail behavior on electric RC helicopters.

Fitting is simple on compatible setups: slide the pinion onto the motor shaft, set the mesh with the spur gear, and lock it with the set screw or retaining method your motor uses. Once fitted, verify mesh and bearing alignment, then run a low-throttle bench test to ensure smooth engagement before flight.

Maintenance and tuning tips: inspect the teeth for wear after extended use, maintain proper mesh to avoid premature damage, and swap tooth counts incrementally while staying within your helicopter's drivetrain recommendations.