688-12414-A1 Yamaha Gasket Cover | Genuine OEM Yamaha Outboard Part

🔧 Product Description

Genuine Yamaha Thermostat Cover Gasket - Part Number: 688-12414-A1

A genuine Yamaha thermostat cover gasket for selected 75HP to 225HP two-stroke outboards.

The gasket seals the thermostat cover to the cylinder-head or crankcase cooling passage, preventing water leakage and maintaining controlled cooling flow through the thermostat assembly.

⚙️ Key Features

• Genuine Yamaha OEM thermostat cover gasket
• Correct Yamaha part number 688-12414-A1
• Used across Yamaha inline and V4 / V6 two-stroke engines
• Heat- and water-resistant sealing material
• Cross-references with Sierra, Recmar, Mallory and GLM replacements

🚤 Compatibility

Commonly used on

• Yamaha two-stroke thermostat cover and cylinder-head cooling assemblies

Typically suits

• Engine models:
• Yamaha C75, E75 and P75
• Yamaha C80
• Yamaha C85 and CV85
• Yamaha C90
• Yamaha 90, B90 and B115
• Yamaha 115, 130, 150, 175 and 200
• Yamaha 220 and 225 applications using gasket 688-12414-A1
• Yamaha P115, P150, PX150, P175 and P200
• Yamaha S115, S130, S150, S175 and S200
• Yamaha D150 and DX150
• Yamaha SX150 and SX200
• Yamaha V150 and V175
• Yamaha VX150
• Yamaha ProV150
• Yamaha VZ150, VZ175 and VZ200 2.6L HPDI
• Yamaha Z150, Z175 and Z200 2.6L HPDI
• HP Range: 75HP - 225HP
• Engine Type: Yamaha carburetted, OX66 and HPDI two-stroke outboard
• Year Range: Approximately 1980s - 2010s, dependent on cylinder-head design

🔌 Function

The gasket seals the thermostat cover joint so the cooling system can maintain water pressure and regulate engine temperature.

⚠️ Common Signs of Failure

• Water leaking around the thermostat cover
• Salt or rust staining at the gasket edge
• Engine overheating after thermostat service
• Gasket becomes brittle, compressed or torn
• Cover will not seal after removal and refitting

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 688-12414-A1 → Supersedes 688-12414-00
• 688-12414-00 earlier Yamaha thermostat gasket reference

OEM / Related Numbers

• 688-12414-A1
• 688-12414-A1-00
• 68812414A100
• 688-12414-00
• 6E5-12414-A0 related thermostat gasket reference
• 6E5-12411-series related thermostat

Aftermarket / Verified Equivalents

• Sierra: 18-0844
• Recmar: REC688-12414-A1
• Mallory: 9-60003
• GLM: 38045
• Asaki: 688-12414 replacement gasket

📦 Condition

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