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

This rocker support is an RC-scale replacement component intended for the O.S. Engine FS series carbureted engines, specifically compatible with FS-40S, FS-48S, and FS-52S models. It serves as the mounting and guidance point for the rocker assembly, helping maintain 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, replace the support in the same orientation, and reassemble using the original fasteners. Check clearances and valve timing after reassembly; small adjustments to rocker shims or shaft seating may be required to restore correct valve lift.

In practical tuning and maintenance, the support plays a role in consistent valve motion and repeatable performance. Replacing a worn or damaged rocker support can reduce valve lash variability, improve engine consistency between runs, and simplify routine servicing of the rocker train.