Head Gasket OS45514022 for FS-120S by O.S. Engine  [OS45514022]

Service gasket for FS-120S

The OS45514022 head gasket is an RC replacement designed for FS-120S engine units, restoring the sealed joint between the cylinder head and crankcase during servicing or rebuilds. The part number OS45514022 explicitly references the FS-120S model family.

Fitment is controlled by the FS-120S designation in the part code. Confirm your engine is an FS-120S prior to ordering, as OS45514022 is manufactured to fit that series of glow engines. This item should not be used on non-RC or full-size engines.

Fitting the gasket is a standard procedure for hobbyists familiar with engine upkeep: remove the head, inspect the seating faces for warpage or residue, replace the old gasket with OS45514022, and reassemble. Use proper sealing practice, do not overtighten fasteners, and swap the gasket each time the head is taken off to maintain compression and prevent leaks.

For tuning and everyday operation the gasket underpins steady compression and consistent engine reaction, which simplifies tuning adjustments and helps deliver repeatable performance. Keeping extra OS45514022 gaskets available is a low-cost way to avoid lengthy repairs.