Embla EB Compatible 15T Pinion Gear HI0304170 (Hirobo)  [HI0304170]

Compatibility and Tuning Notes for Embla EB Pinion

This replacement pinion is listed as Hirobo model HI0304170 and features a 15T tooth count, suitable for installations on Embla EB-series helicopters where a 15-tooth motor pinion is called for.

The gear's function is to transfer torque from the motor into the main gear train, affecting the overall gear ratio and the helicopter's rotor response. Altering the pinion tooth count is a straightforward tuning option to influence head speed and handling on electric RC helicopters.

To fit, align the pinion on the motor shaft, set correct mesh with the spur gear, and secure the pinion with its set screw or retention method. After fitting, check the gear mesh and bearings, then perform a low-throttle bench test to ensure smooth engagement before flying.

Practical advice: keep an eye on tooth condition after use, avoid overly tight or loose mesh to prevent premature wear, and limit tooth-count changes to the safe range specified by your helicopter's drivetrain design.