Sierra 18-3894 Head Gasket - Replaces Yamaha Outboard 6G5-11181-A0-00

The Sierra 18-3894 Head Gasket is a direct-fit replacement head gasket engineered for Yamaha outboard engines. It seals the mating surface between the cylinder head and cylinder block, maintaining proper compression and preventing coolant or combustion leaks that can lead to overheating or power loss. Each Sierra 18-3894 is built to meet or exceed the specifications of the original equipment part it replaces, giving outboard owners a reliable option for engine rebuilds, head gasket replacement jobs, and routine maintenance.

This gasket corresponds to the Yamaha OEM number 6G5-11181-A0-00, so it is intended for use where that OEM head gasket is called for. It ships as a single gasket and is sized for a straightforward swap during a head gasket service, without modification to surrounding components.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3894
• Category: Yamaha Outboard Head Gasket
• OEM Cross Reference: 6G5-11181-A0-00
• Weight: 0.26 pounds
• UPC: 808282258962
• Quantity: 1 gasket per pack

Fitment

Fits applications that call for Yamaha outboard OEM head gasket 6G5-11181-A0-00.

Replaces (OEM)

• 6G5-11181-A0-00

Frequently Asked Questions

What does the Sierra 18-3894 head gasket fit? The Sierra 18-3894 head gasket is designed for Yamaha outboard applications that use the OEM head gasket numbered 6G5-11181-A0-00.

Is the Sierra 18-3894 the same as the Yamaha OEM head gasket? Yes, Sierra part 18-3894 is a direct cross-reference to Yamaha OEM head gasket 6G5-11181-A0-00 and is built to meet or exceed the original equipment specifications.

How much does the 18-3894 head gasket weigh? The Sierra 18-3894 head gasket weighs 0.26 pounds.

How many gaskets come in the package? The Sierra 18-3894 ships as a single head gasket, one gasket per pack.

Is Sierra 18-3894 a genuine OEM part or an aftermarket part? It is a Sierra aftermarket replacement gasket manufactured to meet or exceed the quality of the original equipment part it replaces, not a Yamaha-branded OEM piece.

What is the UPC for the Sierra 18-3894 head gasket? The UPC for the Sierra 18-3894 head gasket is 808282258962.

When would I need to replace this head gasket? A head gasket like the Sierra 18-3894 typically needs replacement when an outboard shows signs of a blown gasket, such as coolant loss, overheating, or a loss of cylinder compression, or as part of a planned head gasket service.

Does the 18-3894 gasket require any modification to install? No, the Sierra 18-3894 is manufactured as a direct-fit replacement for the Yamaha OEM 6G5-11181-A0-00 head gasket and installs in place of the original without modification.

What is the manufacturer part number for this gasket? The manufacturer part number is 18-3894, sold under the Sierra brand.

Can I use this gasket on any Yamaha outboard? The Sierra 18-3894 is intended for Yamaha outboard engines that specify the OEM head gasket 6G5-11181-A0-00; confirm your engine calls for that OEM number before ordering.