O.S. Engine OS45560310 Valve Spring Retainer FS-120S  [OS45560310]

Valve spring retainer for FS series

This valve spring retainer is a direct replacement item listed under O.S. Engine engine parts and identified by model OS45560310 and FS-120S naming. It serves the role of securing valve springs on compatible FS-series glow engines and is intended for use during engine service, repair, or routine rebuilds.

In practical terms, the retainer keeps valve springs seated and aligned during engine operation, so inspecting it as part of regular maintenance reduces the risk of valve timing issues. When replacing this part, verify the part number OS45560310 matches your engine's service parts list and inspect surrounding valve train components for wear.

For tuning and setup, the retainer itself does not alter valve timing but supports reliable spring retention when you adjust valve clearances or swap springs. Use standard workshop care when handling small engine valvetrain parts and follow the engine manufacturer's service intervals.