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DF350A 4-stroke

Suzuki unveils the Maximum 350 horsepower DF350A Outboard!
New Flagship Model Features Innovative Contra-Rotating Propellers, More Exclusive Features

Suzuki Marine, a leader in 4-stroke outboard technology and performance, is proud to introduce its newest model, the DF350A. At 350 horsepower, this V6 4-stroke is the largest, most powerful outboard Suzuki has built to date. In development for more than three years, it represents a significant milestone in both engineering and design.


Electronic Fuel Injection
Drive By Wire
Dual Propeller


DOHC 24-Valve


X: 330kg


267.9cm3 (kW/r/min)

    “We have put a lot of work into this new outboard and we cannot wait to see how the market responds. We have watched with great interest as boats have gotten bigger, especially the center-console market,” said Yasuharu Osawa, Executive General Manager, Global Marine & Power Products Operation, Suzuki Motor Corporation. “Not only that, but we’ve seen an increasing preference for outboards on all kinds of boats that used to be exclusively stern drive or inboard. The time is ripe for this new outboard, and we think you’re going to love it.”

    350 Horsepower And A 12.0:1 Compression Ratio
    Suzuki engineers achieved 350 horsepower while still designing a compact, lightweight powerhead. The robust engine displacement of 4.4 litres is matched by a highperformance 12.0:1 compression ratio, the highest ever for a production outboard engine. A unique combination of cool air intake, dual fuel injectors and a strengthening of the pistons has virtually eliminated engine knock, a typical byproduct of high compression engines.

    Suzuki Dual Louver System, Direct Air Intake
    Suzuki engineers have designed an air intake system that allows the engine to draw in ample fresh air, while separating out water, spray and moisture. Dual louvers under the hood trap larger water droplets and then moisture as it enters the engine cowling, resulting in zero water intake during testing. In addition, intake air temperatures are, on average, 10º cooler than ambient, providing the combustion chamber with cooler, denser air for a more powerful cycle.

    Dual Injectors
    Two, smaller fuel injectors allow for precise injection of fuel to the centre of the combustion chamber, which avoids off-centre combustion – a major cause of knocking. In addition, because 100% of the fuel is injected into the cylinder at once, a degree of cooling is also obtained, providing up to 3% additional power without causing knocking.

    Advanced Piston Technology
    To achieve 350 horsepower, the surface of the piston needs to withstand added forces. In order to assure both performance and long life, Suzuki engineers switched from a standard heat treatment to “shot peening.” Shot peening, a more expensive process, creates fine dimples in the face of the piston that evenly distribute the pressure created during combustion. In addition, the connecting rods and hardware have been strengthened to handle the added loads.

    Suzuki Dual Prop System
    While contra-rotating propellers are not a new technology, they have never been successfully used on outboard motors until now. The DF350A’s dual propellers provide three key benefits, compact size, increased stability and greater “traction.”

    Suzuki engineers spent many hours in computer simulation and on the water, knowing that reducing drag underwater would be essential to improving overall boat speed and performance.

    Contra-rotating propellers also provide added surface area, for more stability and increased “traction” or grip underwater. (Think of the wide slicks on a drag racer as compared to typical tires.) This results in exceptional acceleration, or hole-shot, truer directional propulsion (eliminating steering torque), better than expected top speeds and incredible reverse thrust. Importantly, these benefits are apparent even on heavier boats with full loads of fuel, gear and people.

    Proven Suzuki Technology
    “While these new engines feature a lot of new and innovative technology, they also take advantage of Suzuki’s proven systems,” added Mr. Osawa. “We wouldn’t call them The Ultimate 4-Stroke Outboards without building in


    Bore x stroke 98 x 97mm
    Starting system Electric
    Maximum output 257.4kw
    Full throttle operating range 5,700 – 6,300rpm
    Gear shift F-N-R (Drive-by-Wire)
    Displacement 267.9cm3
    No of cylinders V6 (55°)
    Oil pan capacity 8.0 litres
    Shaft length X: 635 | XX: 762mm
    Ignition system Fully-transistorized
    Trim method Power trim & tilt
    Exhaust Through Prop Hub Exhaust
    Weight X: 330 | XX: 339kg
    Steering Remote
    Gear ratio 2.29:1
    Engine type DOHC 24-Valve
    Engine mounting Shear mount
    Fuel delivery system Electronic Fuel Injection
    Propeller selection pitch Front: 3 x 15.5 x 19.5 – 31.5 Rear: 3 x 15.5 x 19.5 – 31.5
    Alternator 12V 54A

    Additional information

    New / Used