Yamaha – Thermostat | Engine Cooling Control Component | 67F-12411-01-00

Overview

Keeping your Yamaha outboard running at the right temperature is critical for efficiency and engine longevity. This genuine Yamaha thermostat regulates coolant flow through the engine so it warms up properly and maintains a stable operating temperature on the water. When thermostats begin to stick or wear out, engines can run too hot or too cold, which affects performance and fuel efficiency. Replacing the thermostat during routine cooling system service helps keep your Yamaha running smooth and reliable.

Key Features

• Precision Temperature Regulation – Opens and closes at the correct temperature to maintain proper engine operating conditions.
• Genuine Yamaha OEM Component – Manufactured to Yamaha specifications for correct fit and dependable cooling system performance.
• Supports Efficient Engine Operation – Helps maintain optimal combustion efficiency and fuel economy.
• Direct Service Replacement – Designed for straightforward installation during cooling system maintenance or thermostat service.

Engine & Boat Compatibility

Frequently Asked Questions

Q: What are signs that a thermostat may be failing?
A: Common signs include engines running hotter than normal, inconsistent temperature readings, or the engine taking too long to reach operating temperature.

Q: Can a stuck thermostat damage my outboard?
A: Yes. A thermostat stuck closed can cause overheating, while one stuck open can prevent the engine from reaching proper operating temperature.

Q: Should thermostats be replaced during cooling system service?
A: Many technicians inspect or replace thermostats during water pump service or whenever the cooling system is being serviced.

Q: Is thermostat replacement a difficult job?
A: Most Yamaha outboard thermostats are accessible and can be replaced with basic tools during routine maintenance.

Q: Why does engine temperature matter on an outboard?
A: Proper operating temperature ensures efficient combustion, protects engine components, and supports overall engine longevity.

• Supersessions
  67F-12411-00-00, 6CB-12411-00-00