Replacement Valve Spring Seat for O.S. Engine FS-26S, FS-40S and FS-48S - OS45060309  [OS45060309]

Designed for FS-26S, FS-40S and FS-48S engines

This valve spring seat is an RC-scale replacement part intended for the O.S. Engine FS-26S, FS-40S and FS-48S engine family named in the model title. It provides a reliable seating surface so valve springs retain correct alignment during standard maintenance and tuning tasks on nitro model engines.

Installation requires removal of the cylinder head and careful inspection of the valve spring orientation before seating. Use gentle, controlled pressure to avoid deforming the seat or valve guide, and inspect the fitted surface for even contact to ensure dependable valve action after reassembly.

Treat the component as a hobby-engine part and avoid full-size engine repair methods; hobby-level tools preserve the intended tolerances and prevent damage to small parts.