O.S. Engine OS45561410 Rocker Support for FS-120S Engine  [OS45561410]

Rocker support for FS-120S

This is a RC-scale rocker support intended for use with the O.S. Engine FS-120S model, supplied under part number OS45561410. The component functions as a service replacement to maintain rocker alignment and reduce end play in the engine's valve actuation area, keeping the rocker geometry stable during routine maintenance and setup.

Installation is a straightforward service task for model engine maintenance: remove the engine cover or relevant mounting hardware, replace the worn support with the service part, then reassemble while checking clearances and rocker movement. Work at small scale, verify free movement before full reassembly, and follow any engine-specific service manual steps where available.

For tuning and setup, the support contributes to repeatable valve geometry and can help reduce inconsistent valve timing caused by worn or loosened rocker seating. Use it as part of a wider maintenance routine when addressing ticking, excessive end play, or when performing precision adjustments after break-in or repairs.