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

O.S. ENGINES ROCKER ARM FSa-81
Price:
£10.10
Brand:
O.S. Engine
Model:
OS47161100
GTIN:
4531028145382
Condition:
Brand New
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Valve Train Replacement Details

Supplied as part number O.S. Engine OS47161100, this rocker arm is a direct-fit option for FSa-81 style applications within FS-series RC engines. It transmits cam motion to the valve train and is intended for routine maintenance, repair, or tuning of nitro model engines.

Information stresses fit and function rather than precise measurements. Verify the engine part code matches before installing; replacement is normally performed during scheduled service or if valve actuation becomes inconsistent. The component is described as an OEM-fit choice to return correct valve movement on FS-series engines.

Installation notes: remove the rocker cover, check rocker geometry and valve clearance, fit the new arm and confirm unobstructed movement, then re-check engine timing and idle on the model before full operation. This item is for model engine use only.

Will installing this rocker arm affect high RPM stability?

When fitted correctly, the replacement restores consistent valve motion which supports stable timing at higher revs. It will not change designed timing but can prevent instability caused by worn components.

Is this product an OEM part or an aftermarket option?

The item is presented as an OEM-fit option supplied under the O.S. Engine OS47161100 designation. It is intended to match original fit and function for FSa-81 applications.

Are there compatibility nuances to be aware of?

Always confirm the engine part code and compare valve train geometry prior to fitting. Small variations between engine runs and revisions mean a visual check is advised even when part numbers match.

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