6D3-12411-00-00 Thermostat 140°F for Yamaha AR 240 HO 1800 2010-2020

Thermostat for Yamaha

This 140°F thermostat for Yamaha marine engines replaces OEM part 6D3-12411-00-00, regulating coolant flow to keep operating temperatures stable.

Overview

This thermostat for Yamaha manages coolant circulation so the engine warms up correctly and holds its target temperature. It is a direct replacement for OEM 6D3-12411-00-00, rated at 140°F. Suited to owners servicing a Yamaha AR 240 HO 1800 jet boat.

Built For Performance

• 140°F opening temperature matches factory specification
• OEM cross-reference 6D3-12411-00-00 for direct replacement
• Regulates coolant flow to prevent overheating and cold-running issues
• Seals into the stock housing without modification
• Suits marine cooling systems exposed to constant moisture

Fits These Machines

• for Yamaha AR 240 HO 1800
• for Yamaha 1800 series models using OEM 6D3-12411-00-00

On-The-Job Use

• Routine cooling system servicing
• Overheating diagnosis and repair
• Pre-season maintenance on jet boats
• Replacing a stuck or failed thermostat

Specs At A Glance

Good To Know

Q: Will this fit my 2010-2020 Yamaha AR 240 HO? A: It is intended for Yamaha AR 240 HO 1800 models from 2010 through 2020. Confirm your serial number and current thermostat part number before ordering.

Q: Does this come with a gasket? A: This listing covers the thermostat itself. Reuse or replace the housing gasket as your service manual specifies.

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