Thermostat – Fits Yamaha F225/F250/F300 4.2L V6 (Replaces 6CE-12411-00-00)
Thermostat – Fits Yamaha F225/F250/F300 4.2L V6 (Replaces 6CE-12411-00-00) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Thermostat – Fits Yamaha F225/F250/F300 4.2L V6 (Replaces 6CE-12411...
Thermostat – Fits Yamaha F225/F250/F300 4.2L V6 (Replaces 6CE-12411-00-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Thermostat – Fits Yamaha F225/F250/F300 4.2L V6 Outboards is designed for Yamaha F225, F250, and F300 4.2L V6 four-stroke outboard motors from 2006 and later. It also fits Yamaha VF250 models from 2015 onwards, ensuring your engine maintains its optimal operating temperature.
This part is a direct replacement for Yamaha part number 6CE-12411-00-00, providing an exact-fit alternative to the original component.
- Regulates engine temperature at a stock 52°C (125°F).
- Installs directly into the engine block's thermostat housing.
- Engineered specifically for the Yamaha 4.2L V6 cooling system.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 6CE-12411-00-00 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This thermostat fits a wide range of Yamaha 4.2L V6 and VF-series outboards. Please check your specific model and year against the list for correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F225NCA | 225 | 4-Stroke | 2011–2016 | 6CE-12411-00-00 | |
| Yamaha | F225XB | 225 | 4-Stroke | 2016+ | 6CE-12411-00-00 | |
| Yamaha | F225XCA | 225 | 4-Stroke | 2010–2016 | 6CE-12411-00-00 | |
| Yamaha | F250DET1X | 250 | 4-Stroke | 2010+ | 6CE-12411-00-00 | |
| Yamaha | F250NCA | 250 | 4-Stroke | 2014–2016 | 6CE-12411-00-00 | |
| Yamaha | F250UCA | 250 | 4-Stroke | 2010–2016 | 6CE-12411-00-00 | |
| Yamaha | F250XB | 250 | 4-Stroke | 2016+ | 6CE-12411-00-00 | |
| Yamaha | F250XCA | 250 | 4-Stroke | 2010–2016 | 6CE-12411-00-00 | |
| Yamaha | F300BET1U | 300 | 4-Stroke | 2010+ | 6ce-12411-00-00 | |
| Yamaha | F300BETU/BETX | 300 | 4-Stroke | 2016+ | 6CE-12411-00-00 | |
| Yamaha | F300NCA | 300 | 4-Stroke | 2014–2016 | 6CE-12411-00-00 | |
| Yamaha | F300UCA | 300 | 4-Stroke | 2010–2016 | 6CE-12411-00-00 | |
| Yamaha | F300XCA | 300 | 4-Stroke | 2010–2016 | 6CE-12411-00-00 | |
| Yamaha | FL250DET1X | 250 | 4-Stroke | 2010+ | 6CE-12411-00-00 | |
| Yamaha | FL300BET1U | 300 | 4-Stroke | 2010+ | 6CE-12411-00-00 | |
| Yamaha | FL300BET1X | 300 | 4-Stroke | 2010+ | 6CE-12411-00-00 | |
| Yamaha | FL300BETU/BETX | 300 | 4-Stroke | 2016+ | 6CE-12411-00-00 | |
| Yamaha | LF225XB | 225 | 4-Stroke | 2016+ | 6CE-12411-00-00 | |
| Yamaha | LF225XCA | 225 | 4-Stroke | 2010–2016 | 6CE-12411-00-00 | |
| Yamaha | LF250UCA | 250 | 4-Stroke | 2010–2016 | 6CE-12411-00-00 | |
| Yamaha | LF250XB | 250 | 4-Stroke | 2016+ | 6CE-12411-00-00 | |
| Yamaha | LF250XCA | 250 | 4-Stroke | 2010–2016 | 6CE-12411-00-00 | |
| Yamaha | LF300UCA | 300 | 4-Stroke | 2010–2016 | 6CE-12411-00-00 | |
| Yamaha | LF300XCA | 300 | 4-Stroke | 2010–2016 | 6CE-12411-00-00 | |
| Yamaha | VF250XA | 250 | 4-Stroke | 2015–2016 | 6CE-12411-00-00 |
Technical Specs
- Product Type
- Thermostat
- Installation
- Engine Block/Thermostat Housing
- Operating Temperature
- 52°C (125°F)
- Other Technical Attributes
- Used in Yamaha 4.2L V6 cooling system
What’s in the Box
- 1 x Thermostat (Replaces OEM 6CE-12411-00-00)
Installation Notes
- Disconnect the battery and allow the engine to cool down completely before starting.
- Drain the engine coolant to a level below the thermostat housing.
- Locate and carefully remove the bolts securing the thermostat housing cover.
- Remove the old thermostat and gasket, taking note of their orientation.
- Thoroughly clean the mating surfaces of the housing and cover, ensuring all old gasket material is removed.
- Install the new thermostat in the correct orientation.
- Fit a new gasket (sold separately) and reinstall the housing cover.
- Torque the housing bolts to the manufacturer's specified values.
- Refill the cooling system, reconnect the battery, and carefully check for leaks after starting the engine.
Troubleshooting & FAQ
How do I know if my thermostat has failed?
Common signs of a failing thermostat include engine overheating, the engine running too cool and not reaching proper operating temperature, erratic temperature gauge readings, or coolant leaks around the thermostat housing.
Will this thermostat fit my specific Yamaha V6?
This part is specifically designed for 2006+ Yamaha F225, F250, F300 4.2L V6 outboards and 2015+ VF250 models. Always verify your exact engine model and year against our compatibility table before ordering to ensure a perfect match.
Is a new gasket included with this thermostat?
This listing is for the thermostat only. The required housing gasket is sold separately. It is critical to use a new gasket during installation to ensure a proper, leak-free seal.
What is the operating temperature of this thermostat?
This thermostat is calibrated to open at 52°C (125°F), which matches the original factory specification. This ensures your engine maintains its designed operating temperature for optimal performance and fuel efficiency.
Can I install this thermostat myself?
While installation is possible for individuals with strong mechanical experience, we recommend professional installation to prevent potential coolant leaks or engine damage. Always consult the official service manual for your specific engine model.
What is the recommended replacement interval for an outboard thermostat?
It's good practice to inspect your thermostat annually and consider replacing it every 2-3 years as part of your regular cooling system service, particularly if you primarily operate in saltwater environments.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It has been built to OEM-level specifications with comparable materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected for quality and consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most orders; any available expedited options will appear at checkout.
Warranty & returns
This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, please contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original condition. See our full policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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