6D3-12411-00-00 Thermostat 140°F for Yamaha GP-R 1800 2019

Thermostat for Yamaha GP-R 1800

This 140°F thermostat for Yamaha GP-R 1800 watercraft replaces OEM cross-reference 6D3-12411-00-00 and regulates engine coolant temperature for consistent operating conditions.

Overview

This thermostat for Yamaha GP-R 1800 controls coolant flow to keep the engine at a stable 140°F operating temperature. It is a direct replacement for the OEM 6D3-12411-00-00 unit and suits riders maintaining or rebuilding their 2019 personal watercraft.

Built For Performance

• 140°F opening temperature matched to specified engine operating range
• Direct replacement for OEM cross-reference 6D3-12411-00-00
• Constructed for marine coolant and raw water exposure
• Maintains stable engine temperature under load
• Designed for correct seating in the OEM thermostat housing

Fits These Machines

• for Yamaha GP-R 1800, 2019

On-The-Job Use

• Routine cooling system maintenance on personal watercraft
• Engine rebuilds and top-end service
• Replacing a stuck or failed thermostat
• Restoring proper warm-up and temperature regulation

Specs At A Glance

Good To Know

Q: How do I know if my thermostat needs replacing? A: Common signs include slow warm-up, overheating, or erratic temperature readings on your watercraft. If the engine runs cold or hot without stabilizing, the thermostat is a likely cause.

Q: Is this the correct part number for my machine? A: This unit cross-references OEM number 6D3-12411-00-00 for the Yamaha GP-R 1800. Confirm your model year and serial number before ordering to be certain of fitment.

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