Suzuki Thermostats

The thermostat is one of the most critical, and most overlooked, components in your Suzuki outboard's cooling system. A properly functioning thermostat regulates engine temperature by controlling coolant flow, allowing the engine to reach optimal operating temperature quickly and maintain it consistently. A failed thermostat can cause catastrophic overheating in as little as a few minutes of operation.

Suzuki Marine recommends replacing the thermostat every 2-3 seasons as a preventive maintenance item, not just when symptoms appear. A thermostat that sticks closed causes overheating; one that sticks open causes the engine to run too cold, increasing fuel consumption, accelerating engine wear, and potentially fouling spark plugs. Genuine OEM Suzuki thermostats are calibrated to the exact opening temperature specified for each DF engine series.

Boat Max Online stocks OEM Suzuki thermostats for the full DF lineup, from the DF9.9 through DF350A. Our catalog is organized by model to make it easy to find the correct thermostat for your specific engine.