Sierra 18-3608 Thermostat Kit for Yamaha Outboard 122°F

The Sierra 18-3608 is a complete thermostat kit designed specifically for Yamaha 2-stroke outboard motors. This kit maintains optimal engine operating temperature by regulating coolant flow through the engine's cooling system.

What's Included:

• 18-3540 Thermostat with 122°F (50°C) temperature rating
• 18-0844 Thermostat cover gasket

Key Features:

• Precision-engineered to meet or exceed OEM specifications
• Controls coolant flow to optimize engine warm-up and maintain consistent operating temperature
• Prevents overcooling that can lead to poor fuel economy and increased emissions
• Direct replacement for reliable performance in harsh marine environments

OEM Cross References:

• Yamaha 6E5-12411-30-00
• Yamaha 688-12414-A1-00
• Mallory 9-43177
• Sierra 18-3608D

Sierra Marine manufactures premium replacement parts for marine engines, engineered to deliver OEM-quality performance and durability in demanding saltwater and freshwater conditions.