Hirobo HI0404512 TSURUGI SX Compatible 95T Main Gear for Helicopter Transmission  [HI0404512]

Replacement Main Gear for TSURUGI SX (95T)

The Hirobo HI0404512 main gear is an RC transmission spare intended for use with TSURUGI SX helicopter frames. Its primary role is to relay motor torque through the main gearbox to the rotor head while the 95T tooth count defines mesh and the gear ratio paired with the chosen pinion.

Fitment and role: make sure the gear matches TSURUGI SX main shaft diameter and preserves the correct centre distance to the pinion; the 95T number defines the expected tooth engagement and drive ratio for typical TSURUGI SX setups. Prior to final fitting, inspect the pinion and any spacers or washers for wear.

Installation notes: perform a dry-fit to confirm backlash and alignment, manually turn the drivetrain to detect runout or rough engagement, and then secure hardware to the recommended torque. After mounting, check gear mesh both at rest and at low rotor speed and revisit fasteners after initial flying.

Tuning considerations: using a 95T gear sets the baseline head speed relative to pinion selection; altering pinion tooth count or position will affect rotor rpm and feel, so plan throttle or governor adjustments and monitor bearing temps during early tests.