FS-Series Intake Valve FSa-81 - OS44850000 by O.S. Engine  [OS44850000]

FS-series valve overview

The O.S. Engine intake valve OS44850000 (FSa-81) is designed as a spare intake component for models in the FS engine family. It functions as the intake-side sealing element of the induction circuit and is offered as an individual service item for small model engines.

Installation should follow the published engine service instructions. Remove the head per the manual, inspect the valve seat and retainer, replace the valve if needed, and reassemble using the recommended clearances and torque figures. If uncertain about the procedure, seek assistance from an experienced engine technician.

On durability, a correctly fitted intake valve helps preserve consistent mixture flow and throttle response. Frequent checks during routine service reduce the risk of premature wear that can affect running stability.