O.S. Engine OS44882200 Precision Carburettor Rotor 61R Fsa-81-P for RC Engines  [OS44882200]

Rotor purpose and fitting guide

This O.S. Engine carburettor rotor serves as a replacement element for O.S. carburettor assemblies, controlling the throttle opening and idle characteristics in nitro-style RC powerplants. The designation denotes the rotor variant for service and maintenance swaps.

Fitting the rotor requires basic carburettor service skills: remove the carburettor, open the rotor housing following the service steps, inspect the throttle shaft and bushes, then replace the rotor making sure it rotates freely and is correctly oriented. Reassemble and check linkage geometry and idle on the bench before refitting.

In tuning terms the rotor plays a key role in throttle progression and idle stability; installing a well-fitting rotor can restore a smoother relationship between throttle input and engine response. Proceed with incremental adjustments and confirm with test runs.