6D3-12411-00-00 Thermostat 140°F for Yamaha 190 FSH Sport 1900 2024-2026

Thermostat for Yamaha

This thermostat (OEM cross-reference 6D3-12411-00-00) is a 140°F replacement unit that regulates coolant flow to keep your engine at the correct operating temperature.

Overview

The thermostat for Yamaha is a direct-fit replacement engineered to open at 140°F so coolant circulates at the right time and the engine holds a stable operating range. It suits marine owners and mechanics who want dependable temperature control in a 1.9L Yamaha engine. A working thermostat for Yamaha keeps the engine warm enough to run efficiently and protects it from overheating on long runs.

Built For Performance

• 140°F opening temperature matched to the specified engine coolant range
• OEM cross-reference 6D3-12411-00-00 for confident part matching
• Wax-pellet element responds quickly to coolant temperature changes
• Stainless steel spring and brass valve body resist corrosion in marine use
• Seated flange seals against the housing to prevent bypass leaks
• Compact housing fits without modification to surrounding components

Fits These Machines

• for Yamaha 190 FSH Sport 1900 (2024-2026)

On-The-Job Use

• Routine cooling system maintenance and thermostat replacement
• Restoring proper warm-up and temperature regulation after an overheat event
• Freshwater and saltwater engine service
• Pre-season or pre-purchase cooling system inspection

Specs At A Glance

Good To Know

Q: How do I know if the thermostat needs replacing? A: Common signs include slow warm-up, overheating, or erratic temperature readings, so compare behavior against the 140°F rating. Replacing it with the correct 6D3-12411-00-00 unit restores normal coolant flow.

Q: Does this thermostat come with a gasket or seal? A: Confirm with the listing what hardware is included before ordering. The seated flange is designed to seal against the housing, but inspect the seal surface during installation.

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