6D3-12411-00-00 Thermostat 140°F for Yamaha 255 FSH Sport E 1800 2021-2026

Thermostat for Yamaha 255 FSH Sport E 1800

This 140°F thermostat for Yamaha replaces OEM part 6D3-12411-00-00 and regulates engine coolant temperature on 2021 through 2026 255 FSH Sport E 1800 boats.

Overview

This thermostat for Yamaha manages coolant flow so the 1800 engine warms to and maintains its 140°F operating range. It replaces OEM 6D3-12411-00-00 and is intended for owners servicing the cooling system on the 255 FSH Sport E. The thermostat for Yamaha installs in the factory housing position without modification.

Built For Performance

• 140°F opening temperature matched to the 1800 engine cooling spec
• Cross-references OEM part 6D3-12411-00-00 for direct replacement
• Wax-pellet element opens and closes consistently through heat cycles
• Sealing flange limits bypass flow for stable running temperature
• Resists continuous marine coolant and corrosion exposure

Fits These Machines

• for Yamaha 255 FSH Sport E 1800, 2021-2026

On-The-Job Use

• Routine cooling system service and thermostat replacement
• Overheating diagnosis on the 1800 engine
• Winterization and spring recommissioning checks
• Rebuilds after impeller or coolant flow repairs

Specs At A Glance

Good To Know

Q: What symptoms suggest a failed thermostat? A: Slow warm-up, overheating, or unstable temperature readings on the 1800 often indicate a stuck thermostat. Fitting the correct 140°F unit restores normal coolant regulation.

Q: Will this fit my model year? A: It is listed for the 255 FSH Sport E 1800 from 2021 to 2026 and cross-references 6D3-12411-00-00. Verify your serial number and housing before ordering.

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