6H3-11181-A1 Yamaha Gasket Cover | Genuine OEM Yamaha Outboard Part

🔧 Product Description

Genuine Yamaha Cylinder Head Gasket - Part Number: 6H3-11181-A1

A genuine Yamaha cylinder-head gasket for selected 50HP, 60HP and 70HP three-cylinder two-stroke outboards.

The gasket seals combustion pressure, cooling-water passages and the cylinder-head joint between the head and cylinder block.

⚙️ Key Features

• Genuine Yamaha OEM cylinder-head gasket

• Correct Yamaha part number 6H3-11181-A1

• Earlier service version superseded by 6H3-11181-A2

• Used on Yamaha three-cylinder 50HP to 70HP two-strokes

• Sierra, Recmar and WSM-style replacements available

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 6H3-11181-A2 → Supersedes 6H3-11181-A1

• 6H3-11181-A1 → Supersedes 6H3-11181-A0

• 6H3-11181-A0 → Supersedes 6H3-11181-01

• 6H3-11181-01 → Supersedes 6H3-11181-00

• 6H3-11181-00 earlier Yamaha cylinder-head gasket reference

OEM / Related Numbers:

• 6H3-11181-A1

• 6H3-11181-A1-00

• 6H311181A100

• 6H3-11181-A2

• 6H3-11181-A0

• 6H3-11181-01

• 6H3-11181-00

• 6H3-11193-A1 related head-cover gasket

Aftermarket / Verified Equivalents:

• Sierra: 18-3831

• Recmar: REC6H3-11181-A2

• YiheoZux: 6H3-11181 replacement gasket

• Asaki: 6H3-11181-A0 / A1 / A2

• Direct aftermarket head gasket: 6H3-11181-A2

🚤 Compatibility

Commonly used on:

• Yamaha three-cylinder two-stroke cylinder heads

Typically suits:

• Engine models:

• Yamaha 25B applications using the 6H3 cylinder block

• Yamaha 50G

• Yamaha 60F

• Yamaha E60H Enduro

• Yamaha C60

• Yamaha 70B

• Yamaha 70C

• Yamaha 60TL and 70TL three-cylinder models

• HP Range: Commonly 50HP - 70HP, plus selected 25B applications

• Engine Type: Yamaha three-cylinder carburetted two-stroke outboard

• Year Range: Approximately 1984 - 2019, dependent on cylinder-head revision

🔌 Function

The gasket seals the combustion chambers and separates cylinder pressure from the engine cooling passages.

Common signs of failure:

• Low or uneven compression

• Cooling water enters a cylinder

• Combustion gases pressurise the cooling system

• Water or staining appears around the cylinder-head joint

• Engine overheats or misfires after warm-up

📦 Condition

• Genuine Yamaha part

• Brand new

• Supplied in original or equivalent packaging