O.S. Engine OS47161100 FSa-81 Rocker Arm Replacement for FS-Series Engines  [OS47161100]

O.S. ENGINES ROCKER ARM FSa-81
Price:
CAD$19.09
Brand:
O.S. Engine
Model:
OS47161100
GTIN:
4531028145382
Condition:
Brand New
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FS-Series Rocker Arm Overview

This rocker arm is a direct replacement component supplied under the O.S. Engine OS47161100 designation for FSa-81 style parts. Designed for RC-scale FS series engines, it transfers cam motion to the valve train and is intended for routine maintenance, repair, or tuning of nitro-powered RC engines.

The description focuses on fit and function rather than on specific dimensions. Confirm compatibility by matching the engine part code before installation; replacement is normally done during scheduled service or when valve movement shows wear. The part is offered as an OEM-fit option to restore correct valve actuation on FS-series engine assemblies.

Installation notes: remove the rocker cover and inspect rocker geometry and valve clearance prior to fitting the new arm, ensure free movement after assembly, and re-check engine timing and idle behavior on the model before full operation. Treat this strictly as a model engine component and do not use it outside of RC applications.

Will this rocker arm fit every FS-series FSa-81 engine?

It is intended for FS-series engines designated FSa-81. Always verify the engine part code and confirm it matches OS47161100 before fitting to ensure correct fitment.

Does replacing the rocker arm change engine timing or performance?

As a valve train component, a correct replacement restores consistent valve motion, which supports predictable timing and tuning response but does not itself alter designed timing when fitted accurately.

What checks are recommended after installation?

Verify smooth rocker movement, correct valve clearance, and stable idle on the RC model before returning to full operation. Reinspect after the first run to confirm continued correct function.

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