Yamaha 689-11181-A0-00 Outboard Motor Head Gasket

The Yamaha 689-11181-A0-00 Outboard Motor Head Gasket is a genuine Yamaha cylinder head gasket designed to seal the junction between the cylinder head and engine block in Yamaha 2-stroke outboard engines, maintaining compression. It is used in Yamaha 25HP–30HP outboard engines, mounted between the cylinder head and engine block, and features a composite gasket material with a fiber/metal layered design to prevent combustion gas and coolant leaks while preserving compression. This replacement component is superseded by 689-11181-A2-00 and is employed during head servicing, engine rebuilds, and routine maintenance in marine outboard combustion systems.