For YAMAHA Thermostat 66M-12411-01-00 F2.5 F4 F4A F6 F6A F8 F9.9 T9.9 F15 F25

Thermostat for YAMAHA

This thermostat, OEM cross-reference 66M-12411-01-00, regulates engine temperature for YAMAHA outboard motors.

Overview

This thermostat for YAMAHA outboard engines maintains optimal operating temperature, ensuring efficient combustion and reduced wear. Designed for a range of YAMAHA models from 2.5 to 25 horsepower, it replaces OEM part 66M-12411-01-00. The thermostat responds to coolant temperature, opening and closing to control flow.

Built For Performance

• Precisely calibrated opening temperature for YAMAHA outboard cooling systems
• Corrosion-resistant construction withstands saltwater and freshwater environments
• Direct replacement for YAMAHA part number 66M-12411-01-00
• Ensures consistent engine temperature for reliable starts and smooth idle
• OEM-spec design maintains proper cooling system pressure

Fits These Machines

• for YAMAHA F2.5
• for YAMAHA F4
• for YAMAHA F4A
• for YAMAHA F6
• for YAMAHA F6A
• for YAMAHA F8
• for YAMAHA F9.9
• for YAMAHA T9.9
• for YAMAHA F15
• for YAMAHA F25

Specs At A Glance

Good To Know

Q: How do I know if my thermostat needs replacement? A: If your outboard overheats or runs too cool, a faulty thermostat is often the cause. Replace it with this unit to restore proper temperature regulation.

Q: Is this thermostat compatible with both saltwater and freshwater use? A: Yes, the corrosion-resistant materials make it suitable for all water conditions, ensuring long service life in any marine environment.

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