6D3-12411-00-00 Thermostat 140°F for Yamaha 255XD 1800 2021-2026

Thermostat for Yamaha 255XD 1800

This 140°F thermostat fits Yamaha 255XD 1800 models from 2021 through 2026 and replaces OEM part number 6D3-12411-00-00 to regulate engine coolant temperature.

Overview

This thermostat for Yamaha 255XD 1800 watercraft controls coolant flow to hold the engine at its proper 140°F operating temperature. It serves as a direct replacement for part 6D3-12411-00-00, helping the engine warm up quickly and run consistently. Built for riders who service their own machines, this thermostat for Yamaha 255XD 1800 restores stable temperature regulation to the cooling system.

Built For Performance

• 140°F opening temperature matches the factory specification
• Direct replacement for OEM part 6D3-12411-00-00
• Sealed wax element responds accurately to coolant temperature changes
• Housing and flange built to bolt in without modification
• Construction resists corrosion from coolant and marine conditions

Fits These Machines

• for Yamaha 255XD 1800 (2021-2026)

On-The-Job Use

• Routine cooling system maintenance
• Replacing a stuck or slow-opening thermostat
• Restoring proper engine warm-up on the water
• Correcting overheating or overcooling symptoms

Specs At A Glance

Good To Know

Q: How do I know if my thermostat needs replacing? A: Common signs include slow engine warm-up, overheating, or temperature readings that stay too low or climb too high. A 140°F thermostat like this one restores proper regulation.

Q: Does this thermostat come with a gasket or housing? A: This listing covers the thermostat itself as described. Check your service manual for any additional seals or gaskets you may want to replace at the same time.

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