6D3-12411-00-00 Thermostat 140°F for Yamaha 242 X E-Series 1800 2016-2020

Thermostat for Yamaha

This thermostat regulates engine coolant flow on Yamaha 242 X E-Series 1800 boats, with an OEM cross-reference of 6D3-12411-00-00 and a 140°F rating.

Overview

This thermostat is a direct-fit replacement for the factory unit on Yamaha 242 X E-Series 1800 boats built between 2016 and 2020. It opens at 140°F to keep coolant circulating at the correct operating temperature, protecting the engine during both idle and wide-open throttle. It suits owners performing routine cooling system service or replacing a stuck or slow-reacting thermostat.

Built For Performance

• Opens at 140°F for consistent engine temperature control
• Cross-references OEM part number 6D3-12411-00-00
• Constructed for marine cooling system duty
• Direct-fit replacement for the original thermostat
• Compatible with Yamaha 1800 engine applications

Fits These Machines

• for Yamaha 242 X E-Series 1800 (2016-2020)

On-The-Job Use

• Routine cooling system maintenance
• Replacing a thermostat that sticks open or closed
• Engine overheat troubleshooting
• Seasonal service before launch

Specs At A Glance

Good To Know

Q: Is this an original Yamaha part? A: This is an aftermarket thermostat made to cross-reference OEM number 6D3-12411-00-00. Confirm your engine serial number before ordering.

Q: How do I know if my thermostat needs replacing? A: Overheating, slow warm-up, or erratic temperature readings often point to a faulty thermostat. Inspect the housing and gasket during replacement.

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