TSURUGI SX Main Gear Upgrade 95T - Hirobo HI0404512  [HI0404512]

Main Transmission Gear for TSURUGI SX, 95 Teeth

The Hirobo HI0404512 main gear serves as a transmission spare for TSURUGI SX helicopters, transferring motor output through the main gearbox to the rotor assembly. Its 95T tooth specification controls the gear mesh relationship and overall drive ratio when paired with your motor pinion.

Fitment and role: verify the gear matches the TSURUGI SX main shaft sizing and maintains correct centre distance to the pinion; the 95T tooth configuration establishes the expected mesh and drive ratio used in standard TSURUGI SX setups. Inspect mating components like the pinion and any spacers for signs of wear before completing installation.

Installation notes: trial-fit the gear to check backlash and alignment, spin the drivetrain manually to detect runout and ensure smooth engagement, and then fasten hardware to the model-recommended torque values. Reconfirm gear mesh under static and idle rotor conditions and recheck fasteners after initial flights.

Tuning considerations: because the 95T gear sets the base ratio, small pinion changes will significantly affect head speed and torque; adjust throttle mapping or governor parameters accordingly and monitor temperatures and noise during break-in.