6D3-12411-00-00 Thermostat 140°F for Yamaha GP 1800 2017-2018

Thermostat for Yamaha GP 1800

This 140°F thermostat for Yamaha watercraft replaces OEM part 6D3-12411-00-00, regulating engine temperature for consistent performance.

Overview

This thermostat fits Yamaha GP 1800 models from 2017 to 2018, replacing OEM part 6D3-12411-00-00. The 140°F rating keeps coolant flow within the intended range so the engine reaches and holds proper operating temperature. It is a direct-fit replacement for riders servicing their cooling system.

Built For Performance

• 140°F opening temperature matches the original spec for this application
• Cross-references OEM part number 6D3-12411-00-00
• Constructed for marine cooling system demands
• Direct fit into the factory thermostat housing
• Helps maintain stable engine operating temperature
• Suited to fresh and saltwater use with proper maintenance

Fits These Machines

• for Yamaha GP 1800, 2017-2018

On-The-Job Use

• Routine cooling system service and thermostat replacement
• Restoring proper warm-up behavior on a personal watercraft
• Maintenance after overheating or coolant contamination
• Seasonal prep before launching the craft

Specs At A Glance

Good To Know

Q: How do I know this thermostat fits my craft? A: It is listed for the 2017-2018 Yamaha GP 1800 and cross-references OEM part 6D3-12411-00-00. Confirm your model year and existing part number before ordering.

Q: Why does the opening temperature matter? A: The 140°F rating controls when coolant begins circulating, which affects warm-up and operating temperature. Using the specified rating keeps the cooling system working as designed.

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