6D3-12411-00-00 Thermostat 140°F for Yamaha 242 LTD S 1800 2010-2019

Thermostat for Yamaha 242 LTD S 1800

This replacement thermostat for Yamaha marine engines, OEM cross-reference 6D3-12411-00-00, regulates coolant flow to keep the 1800 engine within its 140°F operating range.

Overview

This 140°F thermostat is a direct replacement component for the Yamaha 242 LTD S 1800, built to control coolant circulation as engine temperature rises and falls. The thermostat for Yamaha 1800 applications opens at 140°F to maintain stable operating temperature, protecting the engine during long days on the water. It is intended for owners performing routine cooling system maintenance or replacing a failed thermostat.

Built For Performance

• 140°F opening temperature matches the specified rating for this application
• OEM cross-reference 6D3-12411-00-00 for straightforward fitment matching
• Wax-pellet design responds consistently to coolant temperature changes
• Sealed housing resists corrosion in raw water and closed cooling systems
• Built to hold steady temperature under sustained engine load

Fits These Machines

• for Yamaha 242 LTD S 1800, 2010-2019

On-The-Job Use

• Routine cooling system maintenance on Yamaha 242 LTD S boats
• Replacing a thermostat stuck open or closed
• Overheating diagnosis and repair on the 1800 engine
• Seasonal prep or winterization of the cooling system

Specs At A Glance

Good To Know

Q: How do I know if my thermostat needs replacing? A: Common signs include the engine running cold, overheating, or taking too long to reach operating temperature. A thermostat stuck open or closed will affect coolant flow and should be replaced.

Q: Does this thermostat come with a gasket? A: This listing covers the thermostat itself as described. Check your engine's parts diagram to confirm whether a separate gasket or seal is needed for installation.

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