RC Carburettor Rotor OS42581200 for O.S. Engine Carburettor Assemblies 70R Fsa-155-P  [OS42581200]

Replacement rotor for glow engine carburettors

This O.S. Engine rotor is the rotating core inside the carburettor slide, responsible for precise metering and throttle modulation. It serves as a service item for hobbyists who maintain or rebuild nitro carburettor units.

To fit, remove the carburettor from the engine, note how the rotor sits in the slide, check the mating surfaces for wear and debris, then refit the rotor ensuring free, even movement. Use gentle pressure when reassembling and retain any undamaged seals or O-rings for re-use.

Changing the rotor will not affect fuel properties but will influence mechanical response; slight differences in rotor condition can change idle stability and throttle progression, so consider swapping the rotor when troubleshooting inconsistent idling. Clean with mild solvent and avoid abrasive methods that could alter clearances.