Yamaha 6G8-12411-03-00 Thermostat (Superseded by 66M-12411-01-00)

The Yamaha 6G8-12411-03-00 thermostat is a genuine OEM replacement designed to regulate the cooling system in your Yamaha outboard. This part has been superseded by 66M-12411-01-00, which offers the same fit, function, and Yamaha quality.

Key Features

• OEM Yamaha Quality – Precision-engineered to Yamaha specifications for reliable cooling performance.
• Superseded Part – Replaced by Yamaha part # 66M-12411-01-00.
• Engine Protection – Helps maintain correct operating temperature, preventing overheating and reducing engine wear.
• Durability – Resistant to corrosion and high-temperature marine conditions.

Specifications

• Part Number (Old): 6G8-12411-03-00
• Superseded Part Number (New): 66M-12411-01-00
• Component Type: Outboard thermostat
• Material: Marine-grade metal + heat-sensitive wax pellet design
• Function: Opens and closes to regulate coolant flow, ensuring consistent engine temperature.

Compatibility

This thermostat is used in a variety of Yamaha outboard engines. For exact fit, confirm with your engine serial number or Yamaha service manual.

Installation Guide (Simplified)

1. Disconnect the battery and ensure the engine is cool.
2. Remove the thermostat housing bolts carefully.
3. Take out the old thermostat and gasket.
4. Install the new thermostat (66M-12411-01-00) in the same orientation.
5. Reinstall housing with a new gasket or O-ring if required.
6. Torque bolts to Yamaha specifications.
7. Reconnect the battery and run engine to check proper temperature regulation.

If unsure, always have a qualified Yamaha technician perform installation.

FAQs

What is the replacement for Yamaha 6G8-12411-03-00 thermostat?

It has been superseded by Yamaha part number 66M-12411-01-00.

Is this thermostat compatible with all Yamaha outboards?

Compatibility varies by model and year. Always check your engine serial number or manual.

How often should I replace a Yamaha outboard thermostat?

Yamaha generally recommends inspecting/replacing thermostats every 2 years or 200–300 hours, depending on usage.

What happens if my thermostat fails?

A stuck thermostat can cause overheating or poor performance. Early replacement prevents major engine damage.

Does this thermostat come with a warranty?

Yes, genuine Yamaha parts typically include a limited warranty (varies by dealer).

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.