O.S. Engine OS45561401 Rocker Support Assembly FS-120S  [OS45561401]

Rocker Support for FS-120S

The O.S. Engine OS45561401 Rocker Support Assembly FS-120S is an RC-scale engine replacement part designed to restore and maintain correct rocker geometry on the FS-120S engine family. It serves as the structural mounting for the rocker assembly, helping keep valve actuation consistent under regular operating conditions.

When servicing an FS-120S engine, this support assembly is the component that locates the rocker shaft and interfaces with the cylinder head. Technically focused, the part's role is to provide a stable platform for the rocker components so that valve timing and tappet contact remain predictable after maintenance or rebuilds.

Installation considerations: this part replaces the OEM rocker support on FS-120S units and should be fitted using the original mounting points and hardware where specified by the engine manual. It is not a performance upgrade by itself, but a maintenance and alignment component that affects how reliably the valve train operates once the engine is reassembled and tuned.

Use this assembly when performing shop-level maintenance on an FS-120S to ensure rocker alignment and consistent valve operation after reassembly.