Keep your Suzuki running cool and confident with the Suzuki Thermostat (17670-98L00)—the small part that guards the heart of your outboard. Tuned to open at 55 °C, this OEM unit regulates coolant flow so your DF300/DF350 reaches peak operating temperature fast, then holds it steady whether you’re trolling tide lines or hammering across open water.

Built for life in salt, the stainless-steel frame and brass wax element shrug off corrosion and mineral scale. Installation is a straight swap into the factory housing; no gaskets to trim, no guessing on torque.

Why this thermostat earns a spot in your spares kit:

• Precise 55 °C calibration keeps oil viscosity ideal for smoother idle and longer component life.

• OEM fit and finish—seated lip seals and alignment tabs drop in perfectly, eliminating leaks.

• Fast-acting wax pellet responds quickly to load changes, preventing thermal spikes when you gun the throttle.

• Corrosion-resistant build stands up to brackish backwaters and long winters in storage.

Replace a sluggish or sticking thermostat and feel the difference in stable temps, cleaner combustion, and peace of mind every nautical mile.