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
Description

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.
Shipping

We can ship to virtually any address in the world with free shipping available for most regions.

For our typical US and Canadian customers , our shipping timeframes are as follows:

  • Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
  • US warehouse shipment: orders will be delivered within 5 days after placing the order.
  • China warehouse shipment: orders will be delivered about 12 days after placing the order.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

About JLM Marine

Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.

As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.

We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.

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