Yamaha - Thermostat - Engine Cooling - 60 C60 E60 P60 70 C70 - 6H3-12411-11-00

Overview

A thermostat is one of those small parts that does a big job every time the motor runs. The Yamaha 6H3-12411-11-00 Thermostat helps regulate engine temperature by controlling coolant flow through the cooling system, so the motor can warm up properly and stay in its operating range. When a thermostat starts sticking, you can end up with an engine that runs too cool, too hot, or just never feels right. Replacing it during cooling system service is a smart move that helps keep older Yamaha outboards dependable on the water.

Key Features

• Temperature Control – Regulates coolant flow so the engine can reach and maintain proper operating temperature.

• Supports Cooling System Performance – Helps prevent overheating and uneven temperature swings during operation.

• OEM Yamaha Fit – Built to Yamaha specifications for proper installation and dependable function.

• Smart Preventative Maintenance Part – A good replacement item during thermostat or water pump service.

Engine & Boat Compatibility

• 60 - 2001-2005
• 70 - 1984-2009
• C60 - 1996-2001
• C70 - 2000-2001
• E60 - 1995-2000
• P60 - 1991-1999

FAQ

Q: What are signs that the thermostat may be going bad?
A: Common signs include overheating, weak warm-up, inconsistent temperature, or poor cooling system behavior.

Q: Should the thermostat be replaced during water pump service?
A: It often makes sense, especially on older engines where cooling system parts are already being inspected.

Q: Can saltwater use shorten thermostat life?
A: Yes. Salt and mineral buildup can cause the thermostat to stick over time if the engine is not flushed regularly.

Q: Will a bad thermostat affect engine performance?
A: It can. An engine that runs too hot or never reaches proper temperature will not run as clean or as efficiently.

Q: Is this a difficult part to replace?
A: On many models it is fairly straightforward, but access and housing layout can vary by engine.

• Supersessions
  6H3-12411-10-00, 6H3-12411-01-00, 6H3-12411-00-00
• Engine Application
  • 60 - 2001-2005
  • 70 - 1984-2009
  • C60 - 1996-2001
  • C70 - 2000-2001
  • E60 - 1995-2000
  • P60 - 1991-1999