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

Precision Mounting for FS-120S

The O.S. Engine OS45561401 Rocker Support Assembly FS-120S is an aftermarket replacement designed to re-establish correct rocker positioning on the FS-120S engine series. It provides the structural location for the rocker shaft and supports even valve actuation throughout typical operation.

When overhauling an FS-120S, this support is the component that seats the rocker shaft and mates to the head. It is engineered to maintain tappet contact and valve timing predictability following maintenance and tuning work.

Fitment advice: this assembly replaces the original rocker support and should be secured using the factory mounting points and recommended hardware. It functions as a service and alignment item rather than a direct performance enhancer.

Fit this support during workshop maintenance on FS-120S engines to ensure the rocker train is aligned and valve operation remains consistent after reassembly.