Yamaha - Thermostat Cover - Cooling System Housing - 63V-12413-50-00

Overview

The thermostat cover is one of those parts you don’t think about until you’re dealing with a leak or overheating issue. I’ve seen engines lose cooling efficiency just from a warped or corroded cover not sealing right. It keeps the thermostat protected and directs water where it needs to go. When it’s in good shape, the cooling system stays tight and does its job without any trouble.

Key Features

• Thermostat Housing Protection – Covers and secures the thermostat within the cooling system.
• OEM Fitment – Designed to Yamaha specifications for proper sealing and alignment.
• Leak Prevention Design – Helps maintain a tight seal to prevent coolant loss.
• Corrosion-Resistant Build – Built to withstand constant exposure to water and heat.

Engine & Boat Compatibility

Fits Yamaha outboard engines equipped with compatible thermostat housing systems. Commonly used on small- to mid-range horsepower outboards across fishing boats, tenders, and recreational vessels.

FAQ

Q: What are signs a thermostat cover needs replacing?
A: Leaks, corrosion, or poor sealing around the housing are common signs.

Q: Can a bad cover cause overheating?
A: Yes, if it doesn’t seal properly, it can affect water flow and cooling efficiency.

Q: Should I replace this when changing the thermostat?
A: It’s a good idea to inspect it and replace it if there’s any wear or damage.

Q: How does saltwater affect this part?
A: Salt can cause corrosion over time, especially around sealing surfaces.

Q: Is this part still current?
A: This part has been superseded by 63V-12413-50-1S, which is the updated version.

• Supersessions
  63V-12413-50-1S, 63V-12413-50-1S