O.S. Engine OS45561010 Rocker Arm Assembly - Fits FS-120S, S-II, S-E, S-SP, FT-300  [OS45561010]

O.S. ENGINES ROCKER ARM ASSEMBLY FS-120S,S-II,S-E,S-SP,FT-300
Price:
CAD$22.18
Brand:
O.S. Engine
Model:
OS45561010
GTIN:
4531028123519
Condition:
Brand New
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Replacement rocker arm for FS-series cylinder heads

This rocker arm assembly is an RC-scale replacement part specified by the manufacturer for use on the listed FS-series engines. It functions as the valve actuation linkage within the cylinder head and restores correct geometry where worn or damaged components impair valve timing.

Fitment is limited to the models shown in the product title, so verify the model number before ordering to confirm compatibility. When servicing an RC engine, inspect clearances and ensure fastenings are secure during reassembly to maintain predictable engine behaviour at model scale power levels.

During maintenance and tuning the rocker arm assembly directly influences valve timing and response; check rocker alignment and rocker-to-valve clearance as part of any tune-up or replacement procedure to keep the engine performing as expected in RC use.

Specifications

  • Item: Rocker Arm Assembly
  • Material: Not specified by manufacturer
  • Model Number: OS45561010
  • Compatibility: FS-120S, S-II, S-E, S-SP, FT-300

Choose this genuine replacement when restoring valve linkage on compatible FS-series RC engines, and follow standard engine reassembly checks for clearance and secure mounting.

Is this rocker arm assembly a direct replacement for FS-120S engines?

Yes. The listing names FS-120S among the compatible models, so this assembly is intended to replace the original rocker arm on those engines without modification.

What checks should be performed after fitting the new rocker arm?

After installation verify rocker alignment, measure valve lash/clearance, and torque all fasteners to the recommended values. Perform a controlled run-in and confirm stable idle and throttle response before full operation.

Can this part be used on O.S. engines not listed?

Use is confined to the compatibility list in the product title. For other models check part cross-reference data with an authorised dealer to avoid fitment issues.

Will replacing the rocker arm change tuning requirements?

Yes. Replacing worn rocker components can alter valve timing and response, so re-check clearances and perform tuning steps after replacement to restore intended engine performance.

Where can I source genuine replacement parts or support?

For genuine parts and technical assistance contact your authorised O.S. Engine dealer or the manufacturer's support channels to ensure correct components and guidance.

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