O.S. Engine OS45261410 Rocker Support for FS-40S, FS-48S, FS-52S  [OS45261410]

This rocker support is a replacement component intended for the O.S. Engine FS series carbureted engines and is compatible with FS-40S, FS-48S, and FS-52S models. It provides the mounting and guide point for the rocker assembly and helps maintain correct valve geometry during running and tuning.

Installation is straightforward for hobbyists familiar with small glow engines: remove the engine head and rocker assembly, inspect the rocker shaft and bearings for wear, fit the new support in the same orientation, and reassemble using the original fasteners. After reassembly check clearances and valve timing; small adjustments to rocker shims or shaft seating may be needed to restore correct valve lift.

In routine service and tuning the support helps keep valve motion consistent. Replacing a worn or damaged support reduces valve lash variation, improves repeatable performance between runs, and makes rocker train maintenance simpler.