6D3-12411-00-00 Thermostat 140°F for Yamaha 190 FSH Sport 1800 2016-2023

Thermostat for Yamaha 190 FSH Sport 1800

This 140°F thermostat for Yamaha replaces OEM part 6D3-12411-00-00, regulating engine coolant temperature on 1800-series marine engines.

Overview

This thermostat for Yamaha keeps your 1800-series engine at a stable 140°F operating temperature. Built as a direct replacement for part 6D3-12411-00-00, it helps maintain proper coolant flow and consistent combustion conditions on the water. It suits owners performing routine cooling system service on their 190 FSH Sport.

Built For Performance

• 140°F opening temperature rated for marine 1800 engine coolant circuits
• Direct cross-reference to OEM part 6D3-12411-00-00
• Corrosion-resistant construction suited to raw water cooling systems
• Precision wax element for consistent opening and closing
• Seals tightly against the thermostat housing to prevent bypass leaks

Fits These Machines

• for Yamaha 190 FSH Sport 1800 (2016-2023)

On-The-Job Use

• Routine cooling system maintenance and seasonal servicing
• Replacing a stuck or slow-opening thermostat
• Restoring stable engine temperatures after overheating events
• Preventive replacement before summer boating season

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 gauge. A thermostat stuck open or closed usually shows these symptoms before any serious damage occurs.

Q: Is this the same temperature rating as the factory part? A: Yes, it opens at 140°F to match the original specification for 1800-series marine engines. Always verify your engine serial number 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.