DF350A / DF300B
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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 HORSEPOWER SOLUTION Designing an outboard with more 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 350HP solution was to increase the compression ratio to 12.0:1, the highest compression ratio ever for a production outboard...

DIRECT INTAKE SYSTEM AND DUAL LOUVER SYSTEM FOR COOL AND DRY AIR 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...

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 BACK I N THE DF3 5 0 A/ D F 3 0 0 B 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...

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/DF300B delivers the additional torque that outboards need for accelerating in the low to mid-range. 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...

O UR PROVE N TECH N OLOGIES ARE BACK I N THE DF3 5 0 A/ D F 3 0 0 B 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/DF300B 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...

FUEL COOLER Cooler fuel is more dense, and dense fuel delivers more performance. A fuel cooler in the DF350A/DF300B 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...

RECOMMENDED TRANSOM HEIGHT (in.) COMPRESSION RATIO RECOMMENDED FUEL WEIGHT (Ibs.) *1 ENGINE TYPE Valve Train Drive FUEL DELIVERY SYSTEM Chain with Variable Valve Timing Electronic Fuel Injection with Dual Injectors Per Cylinder PISTON DISPLACEMENT cu.in. (cm3) BORE × STROKE in. (mm) MAXIMUM OUTPUT (HP) FULL THROTTLE OPERATING RANGE rpm IGNITION SYSTEM ALTERNATOR ENGINE MOUNTING TRIM METHOD Fully-transistorized 12V 54A Shear Mount Power Trim and Tilt GEAR RATIO GEAR SHIFT EXHAUST PROPELLER SELECTION (Pitch)*2 All propellers are the 3-blade type Through Prop Hub Exhaust FRONT: 3×15...

Part No. 99953-30050-020 Product Info ©2020 Suzuki Motor of America, Inc. Printed in USA