O.S. Engine OS29088200 Carburettor Rotor for O.S. Engine Carburettors  [OS29088200]

Component description and role

This RC-scale carburettor rotor is made to fit inside O.S. Engine carburettor assemblies. It serves as a serviceable replacement or spare, described here with emphasis on routine maintenance, tuning checks, and correct reassembly for nitro model engines.

The rotor operates purely as a mechanical metering element within the carburettor, influencing throttle response and idle stability via its seating and rotation. When replacing the rotor, ensure it sits correctly in the carburettor body and that rotation is smooth prior to final reassembly to maintain consistent fuel metering.

Installation notes: remove the carburettor from the engine following the engine maker's service procedure, inspect seals and needle seats, fit the rotor with correct alignment, and bench test for free movement and correct needle interaction. After refitting, perform a controlled run-in and carry out basic needle tuning to restore proper idle and mid-range behavior.