Outboard Engine Thermostat – Fits Yamaha 75-250 HP 4-Stroke (Replaces 67F-12411-00, 67F-12411-01-00)

Outboard Engine Thermostat – Fits Yamaha 75-250 HP 4-Stroke

This thermostat is a direct replacement for a wide range of Yamaha 4-stroke outboard engines from 75 HP to 250 HP, including F-Series (F75, F80, F90, F100, F150, F200, F225, F250) and VF-Series (VF200, VF225, VF250) models from 2001 to the present.

It is engineered to meet or exceed OEM specifications, ensuring proper engine operating temperature for optimal performance and fuel efficiency. This component directly replaces Yamaha parts 67F-12411-00-00, 67F-12411-01-00, and 6CB-12411-00-00, along with Sierra 18-3632 and Suzuki 17670-90J00.

• Installation: Mounts directly to the engine housing as a direct-fit replacement.
• Materials: Constructed from high-quality stainless steel and copper for high thermal conductivity and corrosion resistance.
• Package Includes: 1x Thermostat and 1x Thermostat Seal.

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.

Yamaha Outboards

Suzuki Outboards

Technical Specifications

Package Contents

• 1 x Thermostat (67F-12411-01-00/67F-12411-00-00/6CB-12411-00-00)
• 1 x Thermostat Seal (67F-12412)

Installation Guide

1. Disconnect the Battery: Ensure the engine is off and cool, then disconnect the negative battery cable.
2. Drain Coolant: Place a drain pan under the engine and drain a sufficient amount of coolant to bring the level below the thermostat housing.
3. Locate Housing: Identify the thermostat housing on the engine block.
4. Remove Cover: Loosen and remove the bolts securing the thermostat housing cover.
5. Remove Old Thermostat: Carefully lift the cover and remove the old thermostat and its seal or gasket. Note the orientation of the thermostat.
6. Clean Surfaces: Thoroughly clean the mating surfaces of the housing and cover, removing any old gasket material or corrosion.
7. Install New Thermostat: Place the new thermostat and seal into the housing in the correct orientation.
8. Reinstall Cover: Secure the housing cover and tighten the bolts to the manufacturer's specified torque.
9. Refill Coolant: Refill the cooling system with the appropriate coolant.
10. Reconnect Battery: Reconnect the negative battery cable.
11. Check for Leaks: Start the engine and let it warm up, carefully checking for any coolant leaks around the thermostat housing.

Troubleshooting & FAQ

Q: How do I confirm this thermostat fits my engine?
A: Start by checking the "Compatible Engine Models" table on this page. Cross-reference your engine's model, horsepower, and year. For final confirmation, compare the part numbers listed in the "Part Number Cross-Reference" table with the part number stamped on your original thermostat.

Q: What are the symptoms of a bad thermostat?
A: Common signs include the engine overheating (temperature gauge running hot) or the engine not reaching normal operating temperature (running too cool). An overheating engine can cause serious damage, while an engine that runs too cool may have poor performance and reduced fuel economy.

Q: At what temperature does this thermostat open?
A: This thermostat is designed to begin opening at 140°F (60°C) to regulate the engine's operating temperature.

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.