6D3-12411-00-00 Thermostat 140°F for Yamaha SX 250 1800 2021-2023

Thermostat for Yamaha SX 250 1800

This thermostat for Yamaha SX 250 1800 models from 2021 through 2023 regulates coolant flow to hold engine temperature at 140°F and matches the 6D3-12411-00-00 part number.

Overview

This thermostat for Yamaha SX 250 1800 controls coolant circulation so the engine reaches and holds its 140°F operating temperature. It replaces the factory thermostat for Yamaha SX 250 1800 machines built between 2021 and 2023 under the 6D3-12411-00-00 reference. Suited to riders and mechanics handling cooling system repair or routine maintenance.

Built For Performance

• 140°F opening temperature matches the factory spec for the SX 250 1800
• Cross-references part number 6D3-12411-00-00
• Wax-pellet element delivers consistent open and close cycles
• Seals against the housing to stop coolant bypass
• Fits 2021 through 2023 model years

Fits These Machines

• for Yamaha SX 250 1800, 2021
• for Yamaha SX 250 1800, 2022
• for Yamaha SX 250 1800, 2023

On-The-Job Use

• Replacing a thermostat stuck open that keeps the engine cold
• Fixing overheating from a thermostat that will not open
• Routine cooling system service on the SX 250 1800
• Seasonal cooling system refresh before the riding season

Specs At A Glance

Good To Know

Q: What are the signs of a failed thermostat? A: An engine that runs cold and warms up slowly usually has a thermostat stuck open, while one that overheats often has a thermostat stuck closed, and both call for replacement.

Q: Is a gasket included? A: This listing covers the thermostat only, so inspect your housing gasket or O-ring and replace it separately if needed.

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