Hirobo HI0404515 Core Engine Block for SX-series  [HI0404515]

Overview: Hirobo SX core engine block

This RC engine block is supplied as a hobby-grade replacement for Hirobo SX-series helicopters. It forms the main structural support for the engine assembly and mating drivetrain parts and is intended for maintenance use.

Fitment and installation: designed to mate with the factory mounting geometry on SX airframes, the block installs using the original fasteners. Verify threads and seating surfaces, and replace any damaged screws or use the correct grade of thread-lock when required.

Tuning and maintenance role: the block positions engine output relative to transmission components to help minimize runout and vibration. During replacement, recheck shaft alignment and gear engagement, and perform bench checks at low throttle prior to full flight tests.