O.S. Engine OS25881200 40L 55Hz Carburetor Rotor Replacement for Glow Engines  [OS25881200]

Precision rotor for glow engine carburettors

This O.S. Engine OS25881200 carburetor rotor is an RC-scale carburettor component made to fit carburettor assemblies that accept a 40L rotor stamped 55Hz. It functions as the rotating metering element inside the carburettor body and directly affects air and fuel delivery across throttle positions.

Intended for routine replacement, the rotor restores consistent throttle response when wear or deposits degrade the original part. Its shape and sizing match small-model glow engine carburettors that use removable 40L rotors with the 55Hz mark.

Installation notes: the part replaces the existing rotor in the carburettor bore; during reassembly ensure the rotor spins freely without binding and that retaining clips or screws are tightened to the correct level. After fitting, verify idle and re-establish low/high needle settings as required to regain proper mixture and smooth idling.

Tuning impact: rotor surface finish and fit affect throttle transition and idle stability. A properly seated rotor supports repeatable needle adjustments and predictable throttle behaviour on track or during bench testing.