SUZUKI DF350A A REVOLUTION IN INNOVATION
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GEKI: PARTING SEAS

DESIGNED AND ENGINEERED LIKE NO OTHER It’s no secret that bigger boats are growing in popularity, and that is driving demand for more powerful outboard motors. In fact, whether it's offshore fishing boats, cruisers and runabouts, even pontoon boats, many boat builders are looking to replace stern drives and inboard designs with newer, bigger outboards. Why? Because outboards are more efficient, more compact, easier and less expensive to maintain, and more straightforward when it comes time to repower. But building a bigger, more powerful outboard is not without its challenges. Bigger can...

THE 350 HORSEPOWER SOLUTION Designing an outboard with 350 horsepower may sound like a fairly straightforward task, but when you add in the parameters of lighter weight, improved fuel economy and rock-solid reliability, things get much more challenging. We started with a V6 engine with 4.4 liter displacement, which would be the largest displacement in the V6 category. Then we had to figure out how to get 80 horsepower per liter and still achieve our other goals. Our solution was to increase the compression ratio to 12.0:1, the highest compression ratio ever for a production outboard engine....

While riding a fast-moving train on a rainy day, one of our engineers noticed the water particles streaming across the window. That was it! He realized that, at speed, water particles could be directed, trapped and drained away. After countless trials, we developed a Dual Louver System that resulted in eliminating water intake, even in the face of the most severe on-the-water testing. The Dual Louver System ^ incorporates a double shield of blades, each one designed in a dog-leg shape. The outer row of blades capture any spray from the boat and the inner louvers catch and drain the...

DEVELOPMENT OF SUZUKI’S FIRST CONTRA-ROTATING PROPELLER After years of outboard design, Suzuki engineers knew that the shape of the lower unit and the design of the propeller would have a critical impact on performance. The increased power of the new engine required more powerful gears, and more powerful gears were typically larger. After considering alternatives, an innovative idea was proposed: design a contrarotating dual propeller system. The contra-rotating propeller would certainly provide more “grip” underwater, and because contra-rotating propellers distribute the engine torque...

O UR PROVE N TECH N OLOGIES ARE B ACK I N THE DF3 5 0 A SUZUKI’S LEAN BURN CONTROL SYSTEM Suzuki’s innovative Lean Burn Control System was first introduced on the DF90A and 70A to great acclaim. The system predicts fuel needs according to operating conditions, allowing the engine to run on a leaner, more efficient airfuel ratio. It delivers its benefits over a wide operating range, providing significant improvements in fuel economy from low-speed operation into the cruising range. In combination with Suzuki Precision Control electronic throttle and shift system, the operator can precisely,...

SUZUKI’S ADVANCED TECHNOLOGY DELIVERS THE UTMOST IN PERFORMANCE VVT (Variable Valve Timing) Suzuki’s engineers designed the 4.4-liter V6 engine with an aggressive cam profile that delivers maximum output and performance at high rpm. In coupling this cam profile with Suzuki’s advanced Variable Valve. Timing (VVT), the DF350A delivers the additional torque that outboards need for accelerating in the low to midrange. VVT achieves this by adjusting the timing of the intake valves, allowing them to open before the exhaust valves are fully closed, creating a momentary overlap in the timing where...

O UR PROVE N TECH N OLOG IES ARE B ACK I N THE DF3 5 0 A HIGH OUTPUT ALTERNATORS Today’s boats are equipped with a wide array of electronics that demand an ample flow of power to keep them running. With that in mind, Suzuki engineers have equipped the DF350A with an alternator that produces a majority of its maximum 54A (12V) output with the motor running at a low 1,000 rpm—enough power for most circumstances. SINGLE CHARGING SYSTEM Regulator Engine Load Fuse Box Main Battery Alternator Output DUAL CHARGING SYSTEM Magneto Regulator Main Battery CONVENIENT DUAL CIRCUIT CHARGING SYSTEM...

FUEL COOLER Cooler fuel is more dense, and dense fuel delivers more performance. A fuel cooler in the DF350A’s fuel delivery system cools the fuel before it enters the engine, resulting in better combustion and improved performance. Acrylic Resin Clear Topcoat Acrylic Resin Black Metallic (or white) Basecoat Epoxy Primer Undercoat Suzuki Anti-Corrosion Finish Suzuki Aluminium Alloy SUZUKI’S ANTI CORROSION FINISH Suzuki’s Anti-Corrosion Finish is specially formulated to increase the durability of the engine and help protect parts of the aluminum exterior that are constantly exposed to fresh...

*1: Dry Weight: Including battery cable, not including propeller and engine oil. *2: Please inquire at your local dealer for details of the propeller. Specifications are subject to change by manufacturer at any time without notice and they may vary depending on local conditions or requirements. Please inquire at your local dealer for details of any such changes.

4r, Wav cf Life! SUZUKI Part No. 99953-DF350-018 Product Info ©2017 Suzuki Motor of America, Inc. Printed in USA