Hirobo HI0304170 15T Pinion for Embla EB Motor Drive  [HI0304170]

Fitting Guide for HI0304170 on Embla EB

This replacement pinion is specified as Hirobo model HI0304170 and has a 15T tooth count, made to work with Embla EB-series helicopter drivetrains when a 15-tooth motor pinion is required.

The pinion's role is to deliver motor torque into the main gear set, affecting the overall gear ratio and rotor responsiveness. Altering tooth count is a standard tuning method to refine head speed and tail control on electric RC helicopters.

To install, place the pinion onto the motor shaft, set an appropriate mesh with the spur gear, and secure it with the pinion's set screw or other retention method. After fitting, check mesh alignment and bearings, then run a low-throttle bench check to verify smooth engagement prior to flying.

Care and tuning advice: regularly inspect gear teeth for wear after use, avoid overly tight or loose mesh to prevent damage, and only change tooth counts within the safe range for your helicopter's drivetrain design.