6D3-12411-00-00 Thermostat 140°F for Yamaha 212 LTD S 1800 2017-2019

Thermostat for Yamaha

This engine thermostat is a 140°F replacement cooling component that regulates coolant flow to keep operating temperatures stable on Yamaha watercraft, cross-referenced to OEM part 6D3-12411-00-00.

Overview

This 140°F thermostat controls coolant circulation so your engine reaches and holds its intended operating temperature instead of running cold or overheating. It is a replacement part for Yamaha 212 LTD S 1800 models and is aimed at owners and shops handling routine cooling system service. A worn thermostat can cause temperature swings, poor running, and added engine wear, so fitting a fresh thermostat keeps the cooling system doing its job.

Built For Performance

• 140°F opening temperature for correct coolant flow control
• Cross-referenced to OEM part number 6D3-12411-00-00
• Wax-pellet design opens and closes with consistent repeatability
• Sealing flange mates with the factory housing surface
• Corrosion-resistant construction suited to marine cooling systems

Fits These Machines

• for Yamaha 212 LTD S 1800 (2017-2019)

On-The-Job Use

• Replacing a sticking or failed thermostat during cooling system service
• Restoring stable operating temperature on boats that run cold or hot
• Routine maintenance before the boating season begins
• Repair work after an overheat event or coolant flush

Specs At A Glance

Good To Know

Q: What are the signs of a failing thermostat on my boat? A: Temperature readings that climb too high or never reach normal range, plus uneven warm-up, point to a thermostat that is sticking. Replacing it is a low-cost step before chasing larger cooling problems.

Q: Should I replace the thermostat gasket at the same time? A: Yes, fitting a new gasket or seal when the housing is apart helps prevent leaks after reassembly. Check the housing surface for corrosion while you have access.

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