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

Product Details

This OEM-quality Thermostat – Fits Yamaha F225/F250/F300 4.2L V6 Outboards is a crucial component for Yamaha 4.2L V6 four-stroke outboards, covering F225, F250, and F300 models from 2010 to 2022. It ensures proper engine temperature regulation, maintaining optimal performance and preventing overheating.

This part serves as a direct interchange for Yamaha part number 6CE-12411-00-00.

• Regulates engine temperature at a consistent 52°C (125°F).
• Installs directly into the engine block's thermostat housing.
• Constructed from durable copper and brass for superior corrosion resistance in marine environments.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For Yamaha owners, this thermostat fits a wide range of 4.2L V6 offshore and VMAX SHO models. Verifying your specific model code and year is critical for ensuring a perfect match.

Technical Specs

Product Type

Thermostat

Installation Location

Engine Block/Thermostat Housing

Operating Temperature

52°C (125°F)

Housing Material

Copper/Brass

Product Dimensions

6.0" x 6.0" x 6.0"

Application

Used in Yamaha 4.2L V6 cooling system

Warranty

1-Year Manufacturer Warranty

What’s in the Box

• 1 x Thermostat (6CE-12411-00-00)

Installation Notes

1. Disconnect the vessel's battery before starting work.
2. Ensure the engine is cool, then drain the coolant to a level below the thermostat housing.
3. Locate and carefully remove the bolts securing the thermostat housing cover.
4. Note the orientation of the old thermostat before removing it from the housing.
5. Thoroughly clean the mating surfaces of the housing and its cover, removing all old gasket material.
6. Install the new thermostat, ensuring it is seated in the correct orientation.
7. Place a new gasket (sold separately) on the housing and reinstall the cover, tightening bolts to manufacturer torque specs.
8. Refill the cooling system with the correct type and amount of coolant.
9. Reconnect the battery, start the engine, and check for leaks as it warms to operating temperature.

Troubleshooting & FAQ

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.