Yamaha Outboard Thermostats

The thermostat in a Yamaha outboard protects the engine from the two most common causes of internal damage: overheating when it sticks closed, and running too cold when it sticks open, which raises fuel consumption, dilutes the oil and accelerates ring and cylinder wear.

Genuine Yamaha OEM thermostats are calibrated to the opening temperature Yamaha specifies for each engine family; a generic automotive thermostat is not a substitute. Inspect and replace the thermostat at the interval in your Yamaha owner's manual, and replace it any time it fails a temperature test.

Boat Max Online stocks OEM Yamaha thermostats for F and T series outboards across the power range, organized by engine model.

Authorized Yamaha dealer. Free shipping on orders over $149 to the lower 48 states.