Yamaha - Thermostat Cooling System Temperature Control 60V-12411-00-00. Overview. The Yamaha Thermostat 60V-12411-00-00 is one of those parts that keeps your engine running at the right temperature without you thinking about it. When it starts sticking open or closed, you'll notice it with slow warm-ups, overheating, or inconsistent temps. It controls how coolant flows through the engine, so everything depends on it opening at the right time. If your motor isn't holding a steady temperature, this is one of the first things to check.. Key Features. • Accurate Temperature Control - Regulates coolant flow to maintain proper engine operating temperature.. • OEM Fit Precision - Built to Yamaha specifications for correct operation and proper sealing.. • Supports Engine Efficiency - Helps maintain optimal combustion and overall performance.. • Heat-Resistant Construction - Designed to handle constant temperature cycles and marine use.. Engine & Boat Compatibility. • F115 2000-Present• LF115 2