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

Service support for the FS-120S rocker assembly

This component is intended for use with the O.S. Engine FS-120S and carries the part number OS45561410. It is supplied as a replacement support to maintain correct rocker seating and reduce excessive end play that can affect valve operation.

Installers should remove the relevant engine covers or mounting items, replace the existing support with the OS45561410 part, and then reassemble while verifying rocker travel and clearances. Handle the small components with care and follow any manufacturer service notes available for the FS-120S.

During setup and tuning, the support contributes to repeatable valve geometry and can help minimise timing inconsistencies caused by worn rocker points. Use it alongside your regular maintenance checks when addressing issues such as ticking or uneven valve movement.