Yamaha - Thermostat - 115 130 150 15 25 40 50 9.9 LZ200 SX200 SX225 SX250 VX200 VX225 VX250 VZ175 VZ200 - 6E5-12411-30-00

Overview

A thermostat might be small, but it plays a big role in how a Yamaha outboard runs. The Yamaha 6E5-12411-30-00 Thermostat regulates engine temperature so the motor warms up properly and stays within its optimal operating range. When thermostats stick open or closed, engines can run too cool or start creeping toward overheating. Swapping in a fresh OEM thermostat during routine service keeps cooling performance consistent and helps your Yamaha run the way it was designed to.

Key Features

• Precise Temperature Regulation – Maintains proper engine operating temperature for consistent performance and efficiency.

• OEM Yamaha Engineering – Built to exact Yamaha specifications for correct fit and dependable operation.

• Improves Engine Longevity – Helps prevent overheating or improper warm-up conditions that can cause internal wear.

• Ideal for Preventative Maintenance – Commonly replaced during cooling system service to maintain reliable engine performance.

Engine & Boat Compatibility

• 9.9 - 2003-2009
• 15 - 2003-2009
• 25 - 2003-2009
• 40 - 2003-2005
• 50 - 2003-2009
• 115 - 2003-2009
• 130 - 2003-2004
• 150 - 2003-2009
• V150 - 2003-2008
• VX150 - 2003-2004
• VX200 - 2003-2005
• VX225 - 2003-2004
• VX250 - 2003-2004
• VZ150 - 2003-2014
• VZ175 - 2003-2014
• VZ200 - 2003-2004
• Z150 - 2003-2005
• Z175 - 2003-2005
• Z200 - 2003-2009
• LZ150 - 2003-2005
• LZ200 - 2003-2010
• LX225 - 2003
• LX250 - 2003
• SX150 - 2003-2004
• SX200 - 2003-2005
• SX225 - 2003
• SX250 - 2003
• DX150 - 2003-2005

FAQ

Q: What happens if the thermostat fails in an outboard engine?
A: If it sticks closed, the engine can overheat. If it sticks open, the motor may run too cool and not reach its ideal operating temperature.

Q: How often should a thermostat be replaced on a Yamaha outboard?
A: Many technicians inspect or replace thermostats every couple of seasons, especially during water pump or cooling system service.

Q: Can debris cause thermostat issues?
A: Yes. Sand, salt buildup, or debris in the cooling passages can prevent the thermostat from opening or closing properly.

Q: Is replacing a thermostat difficult?
A: On most Yamaha outboards it is a straightforward job that can usually be done with basic tools during routine maintenance.

Q: Does saltwater use affect thermostat life?
A: It can. Salt deposits and corrosion can cause thermostats to stick if the cooling system is not flushed regularly.

• Supersessions
  688-12411-11-00, 688-12411-10-00, 688-12411-01-00, 688-12411-00-00, 6E5-12411-20-00, 6E5-12411-10-00
• Engine Application
  • 9.9 - 2003-2009
  • 15 - 2003-2009
  • 25 - 2003-2009
  • 40 - 2003-2005
  • 50 - 2003-2009
  • 115 - 2003-2009
  • 130 - 2003-2004
  • 150 - 2003-2009
  • V150 - 2003-2008
  • VX150 - 2003-2004
  • VX200 - 2003-2005
  • VX225 - 2003-2004
  • VX250 - 2003-2004
  • VZ150 - 2003-2014
  • VZ175 - 2003-2014
  • VZ200 - 2003-2004
  • Z150 - 2003-2005
  • Z175 - 2003-2005
  • Z200 - 2003-2009
  • LZ150 - 2003-2005
  • LZ200 - 2003-2010
  • LX225 - 2003
  • LX250 - 2003
  • SX150 - 2003-2004
  • SX200 - 2003-2005
  • SX225 - 2003
  • SX250 - 2003
  • DX150 - 2003-2005