Thermostat Kit – Fits Yamaha F75-F250 4-Stroke Outboards (Replaces 67F-12411-01-00, 67F-12411-00-00)

Thermostat Kit – Fits Yamaha F75-F250 & Suzuki 4-Stroke Outboards

This thermostat kit is a direct-fit replacement for a wide range of Yamaha 4-stroke outboard engines from 75 HP to 250 HP (2001–2017). It is also designed to fit select Suzuki outboard models that specify OEM part number 17670-90J00.

This kit provides a reliable solution for maintaining correct engine operating temperature, ensuring optimal performance and fuel efficiency. It directly replaces Yamaha part numbers 67F-12411-01-00, 67F-12411-00-00, and 6CB-12411-00-00, as well as Sierra 18-3632.

• Engineered for direct OEM replacement, ensuring easy installation without modifications.
• Constructed with corrosion-resistant stainless steel and copper components for durability in marine environments.
• Maintains a consistent engine temperature with a specified 60°C (140°F) opening temperature.

Part Number Cross-Reference

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

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.

For Suzuki owners, You can review exploded diagrams here to verify part numbers: Suzuki Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Outboard Thermostat (60°C/140°F) (67F-12411-01-00)
• 2 x Rubber Sealing Rings
• 1 x Gasket (63P-12414-00-00)

Installation Guide

1. Ensure the engine is cool and disconnect the battery.
2. Locate the thermostat housing on the engine block. Place a rag underneath to catch any spilled coolant.
3. Unscrew the bolts holding the housing cover in place and carefully remove the cover.
4. Note the orientation of the old thermostat before removing it from the housing.
5. Remove the old gasket or sealing ring and clean both the housing and cover surfaces thoroughly.
6. Install the new thermostat in the same orientation as the original.
7. Place the new gasket and sealing rings into position.
8. Re-install the housing cover and tighten the bolts to the manufacturer's specified torque.
9. Reconnect the battery, start the engine, and carefully check for any leaks around the housing.

Troubleshooting & FAQ

Q: How do I confirm this thermostat fits my engine?
A: The most reliable method is to match your engine's model and year against the compatibility charts provided on this page. You should also verify that your existing part number matches one of the cross-reference numbers listed, such as 67F-12411-01-00 for Yamaha or 17670-90J00 for Suzuki.

Q: What are common signs that my outboard's thermostat is failing?
A: A faulty thermostat can either stick open or closed. If it sticks open, your engine may not reach its proper operating temperature, leading to poor performance and fuel economy. If it sticks closed, the engine will overheat, which can cause serious damage. An alarm from your engine's warning system or an unusually high reading on your temperature gauge are key indicators.

Q: How often should I replace my thermostat?
A: While there is no universal replacement interval, it is good practice to inspect the thermostat during regular cooling system service (e.g., when replacing the water pump impeller), typically every 2-3 years or 200-300 hours. For engines operated in saltwater, more frequent inspection is recommended.

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.