SX-series Replacement Engine Block HI0404515 (Hirobo)  [HI0404515]

SX-series engine block specifications and role

This RC-scale engine block is offered as a replacement item compatible with Hirobo SX-series helicopters. It functions as the main mounting structure for the engine and interfaces to the surrounding transmission components, and is supplied as a hobby-grade spare part.

Fitment and installation: designed to match SX-series mounting points, installation uses the original fasteners where appropriate. Inspect the mating surfaces and thread engagement prior to final torque, and replace any damaged hex screws to ensure secure mounting.

Tuning and maintenance role: the block positions engine and drive elements to reduce runout that can produce vibration and affect throttle response. During reassembly check gear mesh and shaft alignment carefully and conduct low-throttle test runs before full operation.