This valve is supplied for O.S. Engine FS-series nitro units, serving as the intake/exhaust sealing element within the valve assembly. It is provided as a service spare and should not be presented as an aftermarket performance enhancement.
To fit the part, remove the cylinder head and valve retainer, inspect the valve seat and guide condition, install the new valve if sealing has failed, and reassemble following the engine maker's instructions. Always confirm the OS40660100 part number against your engine's parts list before assuming compatibility with a specific model or chassis.
In service terms, renewing a worn valve reinstates designed compression and helps keep idle and throttle response consistent. This component is intended solely for maintenance and restoration of factory sealing characteristics.
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