6D3-12411-00-00 Thermostat for Yamaha 212SD 1800 2021-2022 140°F

Thermostat for Yamaha

This thermostat for Yamaha marine engines, OEM cross-reference 6D3-12411-00-00, regulates coolant flow to keep your engine at a steady 140°F operating temperature.

Overview

This thermostat for Yamaha is a direct replacement engine cooling component that opens and closes to control coolant circulation. The 140°F rating helps your 1800 series engine reach and hold proper operating temperature for efficient combustion. It is built for boat owners performing routine cooling system maintenance.

Built For Performance

• Opens at 140°F to maintain stable engine temperature
• OEM cross-reference 6D3-12411-00-00 for exact fitment
• Constructed for marine cooling system conditions
• Helps prevent overheating during sustained load
• Supports consistent combustion efficiency

Fits These Machines

• for Yamaha 212SE 1800 (2021-2022)
• for Yamaha 212SD 1800 (2021-2022)

On-The-Job Use

• Routine cooling system service
• Overheating diagnostics and repair
• Winterization and spring recommissioning
• Engine rebuilds and refresh projects

Specs At A Glance

Good To Know

Q: How do I know if my thermostat needs replacing? A: Common signs include the engine running cold, overheating, or erratic temperature readings. Replacing it during routine cooling system service is good practice.

Q: Should I replace the gasket at the same time? A: Yes, it is good practice to fit a new gasket or seal whenever the thermostat housing is opened. This helps prevent leaks after reassembly.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.