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

O.S. ENGINES CARBURETTOR ROTOR 70R Fsa-155-P
Price:
AUD$20.62
Brand:
O.S. Engine
Model:
OS42581200
GTIN:
4531028148277
Condition:
Brand New
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Service rotor for nitro RC carburettors

The O.S. Engine carburettor rotor provides the controlled rotation within the carb slide that affects throttle feel and idle behaviour. It is intended as a replaceable component for routine service and performance checks.

Installation follows standard carburettor servicing practice: remove the carburettor, document rotor orientation, clean mating surfaces, slide the new rotor onto its shaft, and confirm unobstructed movement across the throttle range. Apply minimal force during assembly and keep the work area free of grime.

In tuning work the rotor is a mechanical influence on throttle progression rather than a fuel tuning element; worn rotors can manifest as sticky throttle or unstable idle. Handle the part gently when cleaning and avoid aggressive cleaners that might change its fit.

Does the rotor alter idle or top-end behaviour?

The rotor primarily affects idle stability and throttle transition; changes to top-end power are unlikely unless severe wear disrupts airflow metering.

Are there any cleaning cautions for OS42581200?

Use mild detergents or approved carb cleaners and avoid abrasive pads. Excessive abrasion can alter seating surfaces and impair fitment.

How do I diagnose a sticky throttle related to the rotor?

Check for smooth rotation, inspect for deposits or scoring, verify the slide returns freely, and confirm the rotor is not binding against its bore. Replace if movement is compromised.

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