For Yamaha Outboard Thermostat Replaces Sierra 18-3541 66M-12411-01-00 New

Outboard Thermostat for Yamaha

This outboard thermostat replaces Sierra 18-3541 and OEM 66M-12411-01-00, regulating engine temperature for reliable operation.

Overview

This thermostat for Yamaha outboard engines maintains optimal operating temperature by controlling coolant flow. Replacing worn thermostats with this Yamaha-compatible part helps prevent overheating and ensures consistent engine performance. Designed for marine use, this thermostat is a direct replacement for original components.

Built For Performance

• Precision-engineered to open at specified temperature
• Corrosion-resistant construction for saltwater environments
• Direct replacement for Sierra 18-3541 and OEM 66M-12411-01-00
• Ensures proper engine warm-up and cooling efficiency
• Maintains optimal fuel economy and emission control

On-The-Job Use

• Used in outboard motor maintenance to prevent overheating
• Common for boat owners addressing temperature fluctuations
• Installed during routine cooling system service

Specs At A Glance

Good To Know

Q: How do I know if my outboard thermostat needs replacement? A: Symptoms include overheating, poor idling, or fluctuating temperature gauges. Replacing it is a common fix.

Q: Can this thermostat be used in saltwater? A: Yes, it is built with corrosion-resistant materials suitable for marine environments.

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