The O.S. Engine OS44514100 head gasket set contains two replacement gaskets for FS-200S and FS-200S-FI engines. It provides the sealing surface between the cylinder head and crankcase and should be replaced whenever the head is removed for service.
By preserving compression and correct head spacing, the gasket contributes to steady idle behaviour and consistent top-end performance. Fitting a new gasket helps avoid leakage that would otherwise change mixture and complicate tuning efforts.
Practical fitting advice: remove all residues from the mating faces, fit the gasket squarely, and tighten head bolts in the sequence and torque recommended by the engine maker. After an initial run, cool the engine and recheck bolt tightness and for any seepage.
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