OS25881210 Carburetor Rotor for 40L-R / 55HZ-R by O.S. Engine  [OS25881210]

Service rotor compatible with 40L-R and 55HZ-R

This rotor is a replacement component intended for O.S. Engine carburettors marked 40L-R and 55HZ-R. It provides the internal rotating action that controls the throttle slide and contributes to mixture and idle regulation on model glow engines.

Fit and role: Designed to match the rotor seating for the 40L-R and 55HZ-R, the part acts as the rotating interface with the carburettor slide and linkage. It is supplied for maintenance and part replacement to restore reliable throttle response.

Installation notes: The item is supplied as the single rotor component to be fitted during carburettor disassembly. Follow the carburettor maker’s assembly sequence, ensure correct alignment and unobstructed movement, and recheck idle and mixture settings on the bench before returning the model to service.

Tuning and service guidance: Replacing a worn rotor can resolve binding or inconsistent throttle feel that affects mixture stability, though the rotor itself does not modify jet settings. After fitting confirm smooth slide operation and re-establish needle and linkage adjustments.