# 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

  

🔄 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

  

🚤 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

  

📦 Condition

  

• Genuine Yamaha part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 5.48 AUD
- **Vendor:** Yamaha
- **Tags:** Yamaha Marine Parts | Outboard Engine Parts & Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 5.48 AUD | In stock |

## Images

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

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/688-12414-a1-gasket-cover)
> Updated: 2026-07-11