Yamaha - Thermostat Gasket - 9.9 15 - 682-12414-A1-00

Overview

On these smaller Yamaha two-strokes, keeping the cooling system sealed properly makes a big difference in how the engine runs. A worn thermostat gasket can lead to leaks or inconsistent cooling, which you’ll notice over time. It’s one of those simple parts that’s easy to overlook but important to replace when you’re servicing the system. Keeping it fresh helps the motor stay reliable and run at the right temperature.

Key Features

• Cooling System Seal – Helps maintain a tight seal around the thermostat housing.
• OEM Fit and Design – Built to Yamaha specifications for proper alignment and function.
• Leak Prevention Support – Reduces the risk of coolant leaks and air intrusion.
• Service Replacement Part – Ideal for routine maintenance or thermostat service.

Engine & Boat Compatibility

Compatible with Yamaha 9.9 and 15 horsepower two stroke outboards.

FAQ

Q: What are signs this gasket needs replacing?
A: Leaks around the thermostat housing or inconsistent engine temperature are common signs.

Q: Should I replace this when changing the thermostat?
A: Yes, it’s best to replace the gasket anytime the housing is opened.

Q: Can I reuse the old gasket?
A: It’s not recommended, as it may not seal properly once removed.

Q: Is this important for saltwater use?
A: Yes, proper sealing helps prevent corrosion and cooling system issues.

Q: Any installation tips?
A: Make sure surfaces are clean and dry before installing to ensure a proper seal.

• Supersessions
  682-12414-00-00