FS-70U / FSa-72 Service Intake Valve - OS44750100 for O.S. Engine  [OS44750100]

Service replacement for FS-series intake

This intake valve is supplied as a maintenance part under the O.S. Engine OS44750100 reference, suitable for FS-70U and FSa-72 engine models. The text below addresses compatibility checks, recommended service precautions, and how valve condition relates to engine reliability.

Fitment notes: being listed for FS-70U and FSa-72 signals intended compatibility with those FS engines; confirm your engine model code before ordering and, if in doubt, measure the valve seat and stem dimensions against the service manual figures.

Service and longevity: intake valves are critical to reliable induction timing in glow-powered model engines; correct seating, clean contact surfaces, and proper spring tension reduce wear and sustain idle quality. When fitting a replacement, clean the seat, use lapping paste only if specified, and secure retainers to the engine maker's torque spec.

Maintenance advice: include valve inspection in routine service intervals because wear or carbon buildup can alter transient response and idle stability; timely replacement keeps the breathing system performing as expected.

Overall, OS44750100 is a specified intake valve for FS-70U and FSa-72 engines intended for maintenance and parts replacement; always confirm engine identification and follow service instructions when fitting the part.