O.S. Engine OS45514010 Service Gasket Kit for FS-120S FS-120S-E  [OS45514010]

Seal replacement for the FS-120S family

This O.S. Engine gasket set provides the essential seals needed to renew mating surfaces on FS-120S and FS-120S-E RC engines. The set focuses on maintenance tasks to stop leaks and preserve compression without modifying engine output or characteristics.

Installation follows standard small glow engine practice: disassemble the affected head or crankcase sections, remove remnants of old gasket material, fit the new gaskets from the kit, and torque fasteners to the correct values. Clean, flat mating faces are critical to avoid pinched gaskets and ensure a consistent seal.

As a maintenance item, these gaskets support reliable running and setup consistency rather than delivering performance gains. Replace them when you find fuel tracking at joins, inconsistent idle, or when compression seems lower than expected after disassembly.