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

Rocker arm assembly for FS engines

This rocker arm assembly is an RC-scale replacement part specified by the manufacturer for use on the listed FS-series engines. It serves as the valve actuation linkage inside the cylinder head and is intended to restore correct geometry where worn or damaged components affect valve timing.

Fitment is limited to the models shown in the product title, check the model number before ordering to confirm compatibility. When servicing an RC engine, retain inspection of clearance and secure fastenings during reassembly to maintain predictable engine behaviour at model scale power levels.

In tuning and routine maintenance the rocker arm assembly affects valve timing and response, so verify 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 applications.

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.