Thermostat Gasket – Fits Yamaha 75-225 HP Outboard Motors (Replaces 688-12414-A1-00, 688-12414-00-00)
Thermostat Gasket – Fits Yamaha 75-225 HP Outboard Motors (Replaces 688-12414-A1-00, 688-12414-00-00)

Thermostat Gasket – Fits Yamaha 75-225 HP Outboard Motors (Replaces 688-12414-A1-00, 688-12414-00-00)

Vendor: JLM Marine
Availability: In Stock
Product Type: Thermostat
$23.99
$10.00
$23.99
Subtotal: $23.99

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Thermostat Gasket – Fits Yamaha 75-225 HP Outboard Motors (Replaces 688-12414-A1-00, 688-12414-00-00)

Thermostat Gasket – Fits Yamaha 75-225 HP Outboard Motors (Replaces 688-12414-A1-00, 688-12414-00-00)

$10.00 $23.99
Thermostat Gasket – Fits Yamaha 75-225 HP Outboard Motors (Replaces 688-12414-A1-00, 688-12414-00-00)

Thermostat Gasket – Fits Yamaha 75-225 HP Outboard Motors (Replaces 688-12414-A1-00, 688-12414-00-00)

$10.00 $23.99
Descripción

Thermostat Gasket – Fits Yamaha 75-225 HP Outboard Motors

This thermostat cover gasket is designed for a precise fit on a wide range of Yamaha 2-stroke outboard engines, including V4 and V6 models from 75 HP to 225 HP (1992 and later). It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring a reliable seal for the thermostat housing and preventing coolant leaks.

Engineered from high-temperature resistant materials, this gasket provides durability and maintains performance under demanding marine conditions, preventing overheating and ensuring proper engine temperature regulation.

  • Installation: Direct replacement for a secure, leak-free fit.
  • Fitment: Fits Yamaha V4 & V6 2-Stroke outboards (75-225 HP).
  • Included: One thermostat cover gasket.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Brand Part Number
Yamaha 688-12414-A1-00
Yamaha 688-12414-A0-00
Yamaha 688-12414-00-00
Sierra 18-0844
Mallory 9-60003

Compatible Engine Models

Confirm your engine model/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Brand Model Rated HP Stroke Years OEM Part No.
Yamaha 75A 75 2-Stroke 1992 and later 688-12414-A1-00
Yamaha E75B 75 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 75C 75 2-Stroke 1992 and later 688-12414-A1-00
Yamaha P75 75 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 80A 80 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 85A 85 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 90E 90 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 90A 90 2-Stroke 1992 and later 688-12414-A1-00
Yamaha B90 90 2-Stroke 1992 and later 688-12414-A1-00
Yamaha C90 90 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 100A 100 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 115E 115 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 115A 115 2-Stroke 1992 and later 688-12414-A1-00
Yamaha E115A 115 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 115B 115 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 115C 115 2-Stroke 1992 and later 688-12414-A1-00
Yamaha B115 115 2-Stroke 1992 and later 688-12414-A1-00
Yamaha S115 115 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 130B 130 2-Stroke 1992 and later 688-12414-A1-00
Yamaha S130 130 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 140A 140 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 140B 140 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 150E 150 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 150A 150 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 150C 150 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 150F 150 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 150G 150 2-Stroke 1992 and later 688-12414-A1-00
Yamaha D150H 150 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 150J 150 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 150L 150 2-Stroke 1992 and later 688-12414-A1-00
Yamaha D150N 150 2-Stroke 1992 and later 688-12414-A1-00
Yamaha Z150P 150 2-Stroke 1992 and later 688-12414-A1-00
Yamaha Z150Q 150 2-Stroke 1992 and later 688-12414-A1-00
Yamaha S150 150 2-Stroke 1992 and later 688-12414-A1-00
Yamaha SX150 150 2-Stroke 1992 and later 688-12414-A1-00
Yamaha V150 150 2-Stroke 1992 and later 688-12414-A1-00
Yamaha VX150 150 2-Stroke 1992 and later 688-12414-A1-00
Yamaha ProV150 150 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 175A 175 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 175B 175 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 175D 175 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 175F 175 2-Stroke 1992 and later 688-12414-A1-00
Yamaha Z175G 175 2-Stroke 1992 and later 688-12414-A1-00
Yamaha Z175H 175 2-Stroke 1992 and later 688-12414-A1-00
Yamaha S175 175 2-Stroke 1992 and later 688-12414-A1-00
Yamaha V175 175 2-Stroke 1992 and later 688-12414-A1-00
Yamaha VZ175 175 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 200E 200 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 200A 200 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 200B 200 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 200C 200 2-Stroke 1992 and later 688-12414-A1-00
Yamaha Pro V 200 200 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 200F 200 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 200G 200 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 200J 200 2-Stroke 1992 and later 688-12414-A1-00
Yamaha Z200N 200 2-Stroke 1992 and later 688-12414-A1-00
Yamaha Z200P 200 2-Stroke 1992 and later 688-12414-A1-00
Yamaha S200 200 2-Stroke 1992 and later 688-12414-A1-00
Yamaha SX200 200 2-Stroke 1992 and later 688-12414-A1-00
Yamaha VZ200 (2.6L) 200 2-Stroke 1992 and later 688-12414-A1-00
Yamaha Z200 (2.6L) 200 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 220A 220 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 225A 225 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 225B 225 2-Stroke 1992 and later 688-12414-A1-00
Yamaha 225D 225 2-Stroke 1992 and later 688-12414-A1-00

Technical Specifications

Specification Value
Product Type Thermostat Cover Gasket
Installation Direct replacement
Material High-temperature resistant material
Shape Rectangular
Fitment Yamaha V4, V6 2-Stroke Outboards
Warranty 30-day return/replacement (Amazon)
Weight 0.63 oz (17.9 g)

Package Contents

  • 1 x Thermostat Gasket (688-12414-A1-00)

Installation Guide

  1. Safety First: Ensure the engine is cool and disconnect the battery's negative terminal.
  2. Drain Coolant: Partially drain the engine's cooling system to a level below the thermostat housing to prevent spills.
  3. Locate Housing: Identify the thermostat housing on the engine block.
  4. Remove Cover: Carefully unbolt and remove the thermostat housing cover. Note the orientation of the bolts if they differ in length.
  5. Remove Old Gasket: Take out the old, worn gasket. Thoroughly clean both the housing and cover surfaces, removing any residual gasket material or corrosion.
  6. Install New Gasket: Position the new gasket correctly onto the cleaned surface of the housing.
  7. Reassemble: Re-install the thermostat cover and tighten the bolts in a crisscross pattern to the manufacturer's recommended torque specification.
  8. Refill Coolant: Top off the cooling system with the appropriate coolant.
  9. Final Check: Reconnect the battery. Start the engine, let it reach operating temperature, and carefully inspect the housing for any signs of leaks.

Troubleshooting & FAQ

Q: How do I confirm this gasket fits my Yamaha engine?

A: Check the compatible models table and cross-reference your engine's model and year. This gasket fits a wide range of Yamaha 2-stroke V4 and V6 outboards from 75 HP to 225 HP (1992 and later). Also, verify the OEM part number matches 688-12414-A1-00.

Q: What are the signs that my thermostat gasket is failing?

A: Common signs include coolant leaks around the thermostat housing, engine overheating, or fluctuating engine temperatures. A visible crack or brittle material on the old gasket during inspection also indicates it's time for a replacement.

Q: Is this an original Yamaha OEM part?

A: No, this is an aftermarket part designed to meet or exceed OEM specifications. It replaces Yamaha part numbers 688-12414-A1-00, 688-12414-A0-00, and 688-12414-00-00.

Q: OEM vs. Aftermarket?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

  • Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
  • This product is an aftermarket replacement part and is not an OEM component.
  • Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

  • Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
  • Fast Global Shipping: Free delivery worldwide in 5–15 days.
  • Direct from Manufacturer: Competitive pricing without compromising quality.
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