Suzuki 4-Stroke Outboard Engines - DF70 and DF90 aim for power, fuel economy
Suzuki Motor Corporation

Twelve years after starting the four-stroke revolution with its award winning DF60 and DF70 outboards, Suzuki has re-invented the category with two efficient models, the DF70 and DF90.

As the first of Suzuki’s new generation four-strokes, they are a showcase of advancements and achievements—such as digital sequential electronic fuel injection, a powerful 2.59:1 final drive ratio, and a zero-maintenance self-adjusting timing chain. They also feature Suzuki’s proven offset drive shaft which, used in combination with a newly designed powerhead, contributes to making the DF90 the smallest and lightest four-stroke outboard in its class. This compact, lightweight design also makes any of these three outboards ideal for use on a wide range of boat types.

These outboards open up more options for boaters in search of the perfect combination of power and performance.

The fact that two of these new outboards (the DF70 and DF90) replace existing 4-strokes, which were Innovation Award winners, shows that Suzuki is not resting on its laurels.

These new 4-strokes have been redesigned from the ground up. The new DF70 and DF90 also offer important new features designed to make them faster, lighter and more efficient.

“These new motors clearly demonstrate our factory’s commitment to constant improvement and innovation,” says Larry Vandiver, marketing director for Suzuki Marine.

This new family of 4-strokes should be an ideal match for a variety of vessels, including small center consoles and runabouts, flats boats, bay boats, pontoon boats and a range of aluminum boats.

To make these new motors lighter and more compact, Suzuki engineers began with a new 91.7 cubic inch inline four-cylinder Dual Overhead Cam powerhead with four valves per cylinder. This compact design means the new DF70 and DF90 will look, fit and balance better on a wide range of popular craft. Better balance also means reduced engine vibration and greater directional stability, for a more enjoyable boating experience.

When it comes to on-the-water excitement, however, these new 4-strokes are no lightweights. Suzuki’s new engine has an under cowl airflow design that helps the engine “breath” better, ensuring an optimum fuel/air ratio at all engine speeds.

Stretching the fuel budget has never been more important to boaters than it is today, so Suzuki engineers set out to make the DF90 the most fuel-efficient outboard in the category. This trio of new outboards also incorporates Suzuki’s new Lean Burn Control Technology, a feature that predicts fuel needs according to operating conditions and allows the engine to operate on a very lean air-fuel ratio.

Suzuki engineers set out to improve fuel economy on the DF70 and DF90 by increasing mechanical efficiency. They designed a new oil pump that improved the internal hydrodynamics of the lubrication system allowing oil to move through the system with less resistance.

Suzuki also added a new, user-adjustable tilt limit switch that prevents the motor from being tilted beyond a predetermined point. This simple change can go a long way in preventing accidental damage to the boat or the motor when launching, retrieving and trailering.

For more information on the new DF70 and DF90 4-stroke outboards or Suzuki’s complete line of advanced 4-stroke models from 2.5 to 300 horsepower, give us a call at Busha Boat Works, Bay City, Texas.