Yamaha - Thermostat - 6E5-12411-02-00 - 3, 4, 5, 6, 8, C30 (1993 & newer)Yamaha Thermostat Cooling System 6E5 12411 02 00 Overview On these smaller Yamaha outboards, the thermostat plays a big role in how the engine warms up and runs. When its working right, the motor reaches temperature and stays there without running too cold or too hot. Ive seen engines run rough or even overheat just because the thermostat stuck open or closed. Swapping it out is a simple fix that helps keep everything running steady. Key Features
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