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• Earlier service version superseded by 6H3-11181-A2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

🚤 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

🔄 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

📦 Condition

• Genuine Yamaha part
• Brand new
• Supplied in original or equivalent packaging