O.S. Engine OS44981200 Carburettor Rotor 60Y FSa-110  [OS44981200]

Function and fit of the carburettor rotor

The O.S. Engine OS44981200 carburettor rotor is a purpose made replacement component for model engine carburettors. It functions as the rotating throttle element that controls airflow and influences throttle response inside the carburettor, and is supplied as a single service part for repair or tuning.

Before fitting, confirm the rotor matches the internal profile of your carburettor body and the shaft diameter of the existing assembly. This item is the rotor only rather than a complete carburettor, so basic disassembly is required to perform the swap. Use suitable small hobby tools and keep shims, clips, and retaining hardware organized during removal.

In tuning scenarios the rotor changes airflow patterns and therefore affects idle and mid range behavior. Small differences in seating or reassembly orientation can change mixture and throttle feel, so run the engine under controlled conditions after installation and adjust the high and low needle settings as needed for the engine and ambient conditions.

This rotor is aimed at hobbyists and workshop technicians who perform carburettor maintenance or targeted tuning on model engines, providing a component level option for repair and setup.