Yamaha - Thermostat Cover - Cooling System Component - 6DA-12413-00-9S

Overview

If you’ve spent any time around Yamaha cooling systems, you know even small sealing parts matter. This thermostat cover keeps everything tight around the thermostat so water flows the way it should and the engine stays in its proper temp range. When these start to wear or corrode, it doesn’t take long before you’re chasing leaks or uneven temps. It’s a straightforward fix that keeps your cooling system doing its job without surprises.

Key Features

• Thermostat Retention – Holds the thermostat securely in place for stable temperature regulation.
• Sealing Surface Integrity – Provides a clean, even surface to maintain proper gasket sealing.
• OEM Fitment – Designed to match Yamaha factory specs for proper alignment and installation.
• Cooling System Support – Helps ensure consistent water flow through the engine block.

Engine & Boat Compatibility

Designed for Yamaha outboards equipped with thermostat-controlled cooling systems. Commonly used across a wide range of engines where maintaining proper operating temperature is essential. Suitable for both freshwater and saltwater environments with regular maintenance.

FAQ

Q: Has this part been updated or replaced?
A: Yes, this version has been superseded by a newer part number, which is the current recommended replacement.

Q: What happens if this cover is slightly warped?
A: Even minor warping can cause leaks or poor sealing, which can affect cooling performance.

Q: Do I need sealant when installing this cover?
A: Typically no—just use a proper gasket, but always follow best practices for your setup.

Q: How often should this part be inspected?
A: It’s worth checking anytime you service the cooling system or replace the thermostat.

Q: Can corrosion cause hidden issues here?
A: Yes, corrosion can eat away at sealing surfaces and lead to slow leaks that are easy to miss at first.

• Supersessions
  6DA-12413-A0-9S, 6DA-12413-A0-9S