Thermostat – Fits Yamaha F225/F250/F300 4.2L V6 Outboards (Replaces 6CE-12411-00-00)

Thermostat – Fits Yamaha F225/F250/F300 4.2L V6 Outboards (Replaces 6CE-12411-00-00)

This aftermarket thermostat is designed for Yamaha F225, F250, and F300 4.2L V6 four-stroke outboards from 2006 and newer. It also fits Yamaha VF250 outboard models from 2015 onwards, ensuring reliable temperature regulation for optimal engine performance.

This component is a direct replacement for Yamaha OEM part number 6CE-12411-00-00.

• Operating Temperature: 52°C (125°F)
• Installation Location: Engine Block/Thermostat Housing
• Application: Yamaha 4.2L V6 cooling systems

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.

Technical Specifications

Package Contents

1 x Thermostat (Replaces 6CE-12411-00-00)

Installation Guide

Follow these general steps to replace the thermostat. Always consult your service manual for model-specific instructions and torque specifications.

1. Disconnect the Battery: Ensure the engine's negative battery cable is disconnected to prevent accidental starting.
2. Drain Coolant: Drain the engine coolant to a level below the thermostat housing.
3. Locate Housing: Identify and access the thermostat housing on the engine block.
4. Remove Housing: Carefully unbolt and remove the thermostat housing cover. Note the orientation of the parts.
5. Remove Old Thermostat: Take out the old thermostat and its gasket or seal.
6. Clean Surfaces: Thoroughly clean the mating surfaces of the thermostat housing and the engine block.
7. Install New Thermostat: Place the new thermostat in the engine, ensuring it is correctly oriented. Install the new gasket.
8. Reinstall Housing: Securely reinstall the housing cover and tighten the bolts to the manufacturer's recommended torque.
9. Refill Coolant: Refill the cooling system with the appropriate coolant.
10. Check for Leaks: Reconnect the battery, start the engine, and let it warm up. Carefully check for any coolant leaks around the housing.

Troubleshooting & FAQ

How do I confirm this thermostat fits my engine?
First, check your original part for the number 6CE-12411-00-00. Next, find your engine's model and year in the "Compatible Engine Models" table above. For extra certainty, you can use the Yamaha parts catalog link provided to see an exploded view of your engine's assembly.

What are the signs of a faulty thermostat?
Common symptoms include the engine overheating (running too hot) or failing to reach its normal operating temperature (running too cool). An engine temperature alarm may also activate.

What temperature does this thermostat open at?
This thermostat is designed to open at 52°C (125°F) to begin circulating coolant through the engine.

OEM vs. Aftermarket?
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.

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

What is your warranty and return policy?
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.