FS-95V Valve OS40960100 for O.S. Engine FS-series glow engines  [OS40960100]

Replacement FS-95V Valve for FS-series O.S. Engines

This FS-95V valve is supplied as O.S. Engine part OS40960100 and is intended for FS-series glow engines used in model aircraft and similar RC applications. It is described as a valve assembly with a precision ground steel stem designed to match the original service specification for straightforward replacement.

Compatibility applies specifically to FS-series O.S. glow engines that accept the FS-95V valve type. Confirm the part number against your engine's service sheet before ordering, since this listing does not enumerate every individual model that may use the valve.

Installation summary: follow the engine maker's procedures to remove the head and valve train, install the replacement valve, check seating and stem clearance, then reassemble. Perform a careful bench run after installation to ensure correct sealing and idle behavior. Do not force the valve into place; correct contact and clearance are crucial.

Service notes: while the valve does not alter ignition advance or carburetion settings, maintaining a correctly seated valve is essential to preserve compression and provide a stable idle, which in turn supports repeatable tuning sessions. Inspect for stem wear and seating damage as part of regular maintenance.