By using our advanced technologies these V6 outboards deliver superior performance. They have dual overhead cam (DOHC) powerheads with four valves per cylinder and multi-point sequential electronic fuel injection. The 55° V-block design and offset driveshafts contribute to making them remarkably compact. The DF300AP, DF250AP and DF250 deliver high performance with our Variable Valve Timing (VVT), by maximising torque in the low/mid-range. The DF250 and DF225 use a multi stage induction system, which maximizes airflow efficiency for ultimate top-end performance.
In addition to our drive-by-wire system (Suzuki Precision Control) and the Lean Burn Control System, the DF300AP and DF250AP feature Suzuki's Selective Rotation.
In its standard form, the outboard will operate in regular clockwise rotation, using the forward gear. Now, by changing the gear-shift mode and adding a counter rotational propeller, the same outboard can operate in counter rotation mode (anti-clockwise).
In counter rotation mode the power is transmitted through the reverse gear, which has been changed to give it the same characteristics as the forward gears. This is a world first in outboard motor technology.
Our flagship V6 range provides the perfect power for both leisure and commercial craft. Suzuki served as the sole supplier of outboard motors to the London 2012 Olympic and Paralympic Games Sailing Regatta in which the DF300AP and DF200 along with the DF140, DF90A, and DF40A were used.
When it comes to leading edge technology, Suzuki has time and again, delivered technological advancements that put Suzuki outboards at the forefront of advanced outboard motor design. Recognizing the DF300AP as the most innovative outboard introduced over the past year, the National Marine Manufacturers Association (NMMA) awarded the DF300AP with its prestigious NMMA Innovation Award for 2012 marking an unprecedented seventh win for Suzuki and following last year's award with the new DF50A/40A, a second, unprecedented back-to-back win for Suzuki.
The number of awards that Suzuki has garnered over the years reflects the company's strong desire to provide its customers with the very best, most innovative and most reliable products possible and acknowledges the outstanding work of the company's engineering staff.
Award Winning Design Integrates both Regular and Counter-Rotation Operation into a Single Unit.
Compared to the original DF300, the biggest changes you'll find on these outboards are in the lower unit, which was redesigned for the Suzuki Selective Rotation system—the world's first integration of regular and counter-rotation models into a single unit. The system consists of a new drive gear layout in the lower unit that allows the outboard to operate in either regular or counter-rotation mode, and a switch that connects to a circuit in the engine compartment that engages the counter-rotation mode.
Like the DF300, the DF300AP/250AP utilizes an aggressive final drive ratio of 2.08:1 allowing it to turn a 406mm (16-inch) diameter propeller available in various pitch size for optimum performance on a wide variety of boats. Changes to gear designs provide greater durability, and adding a two-way water inlet changes water flow into the cooling system for increased cooling efficiency.
In multi-outboard installations on large boats, a counter-rotation outboard is usually paired with a regular rotation model to help keep the boat traveling on an even keel and in a straight line. The DF300AP/250AP is built with special counter rotating gearing in the lower unit, which causes the prop to rotate in the opposite direction. Suzuki Selective Rotation eliminates the need to purchase a dedicated counter-rotation outboard by using a special switch that when connected to a circuit inside of the engine compartment, turns a regular rotation outboard into a counter-rotation model with a counter rotational propeller.* This industry first is made possible through a special, unified design of gears, shaft, and bearings in the lower unit that are designed to operate reliably and efficiently in either regular or counter-rotation directions.
With the addition of Suzuki Selective Rotation, gears in the lower unit were redesigned using a different alloy and slightly larger diameters delivering greater rigidity. The gears are specially heat treated creating gears that are highly durable.
The engine's cooling system relies on water supplied through low water intakes located on the lower unit. Utilizing this dual low water inlet configuration increases water flow into the lower unit, which delivers greater cooling efficiency. Positioning the forward inlet at the gear case nose delivers a greater water supply especially at high speeds. The second inlet is also positioned lower allowing the DF300AP/250AP to operate in shallow water conditions.
The DF300AP/250AP features a redesigned low drag gear case developed to accommodate the new gears utilized in the Suzuki Selective Rotation system.
The case itself is actually larger than the previous model to provide increased gear durability, however it is designed with a smoother, more hydrodynamic shape that allows it to move through the water with less drag and greater efficiency. Areas with the highest drag are indicated in red in the illustrations below. The comparison shows that the new design allows the lower unit to slice through the water with less drag.
Suzuki's innovative Lean Burn Control System was first introduced on the DF90A/80A/70A to great acclaim from boaters and the media alike. It predicts fuel needs according to operating conditions allowing the engine to run on a more efficient fuel mixture through the use of a lean air-fuel ratio. It delivers its benefits over a wide operating range, providing significant improvements in fuel economy from low-speed operation into the cruising range. Combining this system with the Suzuki Precision Control electronic throttle and shift system allows the operator precise control over engine RPM for improved fuel economy over a wider operating range. This combination also delivers smooth power transitions throughout the entire RPM range. In-house testing shows that while cruising, the DF300AP is 14% more economical than the original non-Lean Burn DF300 without sacrificing any power of the original DF300.
Data used in the graphs were obtained through in-house testing under uniformed conditions. Results will vary depending upon operating conditions (boat design, size, weight, weather, etc.)
Suzuki's advanced four-stroke technology delivers cleaner and more efficient operation that conforms to the Recreational Craft Directive (RCD) – Directive 2003/44EC of the European Parliament and of the Council, and has received three-star ratings from the California Air Resources Board (CARB).
Both the DF300AP and DF250AP are equipped with an O2 Sensor Feedback Control system that enables emissions to be cleaner and more stable. The system controls the air to fuel ratio across each of the engine's operating ranges providing an optimum amount of fuel to the engine regardless of rpm.
Suzuki Precision Control is a technologically advanced computer-based control system that replaces the mechanical control cables found in conventional control systems with electronic wiring that eliminates the source of friction and resistance. While you enjoy smooth throttle and shift operation with minimal friction, the system's computer is processing and transmitting commands in real-time to actuators at the engine that deliver precise throttle control with smoother, decisive shifting. This is most evident in the low rpm range where operation is noticeably smooth and accurate. When combined with Suzuki's Lean Burn Control System it allows control of fuel and air flow to boost the limit of the controllable revolution range improving fuel economy over a wide operating range. Suzuki Precision Control also features built-in systems that help guard the engine and drive against damage due to mishandling, and its design and simple wiring make installation easy, reducing the time required for rigging and adjustment. The system offers precision control for single, twin or triple installation as well as dual station operation.
Suzuki's engineers designed the 4.0-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 DF300AP/250AP 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 timing where both sets of valves are open. Using VVT, this overlap can be increased or decreased by altering intake timing with the camshaft resulting in optimum timing for low and mid-range operation.
Another performance enhancing feature on the DF300AP/250AP is a tuned long track intake manifold. Using long intake pipes tuned to provide smooth airflow into the engine the system provides the DF300AP/250AP with enhanced low-end power.
An 81mm spherical bore throttle body smoothes the turbulent airflow into the engine that occurs as the throttle begins to open. Providing a smoother airflow during acceleration results in increased throttle control and stable engine operation at low rpm.
The cooler the fuel the denser it is, and the denser it is the better performance it delivers. Incorporating a fuel cooler in the DF300AP/250AP's fuel delivery system cools the fuel before it enters the engine. Providing the engine with an optimum fuel supply results in better combustion and more performance.
The DF300AP/250AP is designed with a large air induction port to maximize airflow into the engine in order to obtain maximum power output. The increased airflow produces more low- to mid-range torque and provides a wide power band that is necessary in an outboard engine. Suzuki also designed the system with a water separator, which aids in keeping water out of the electronic throttle body and a heat shield to keep intake air from being heated by the engine.
Water in the fuel can be the source of poor combustion, lower power output, and corrosion. To help protect the engine from moisture in the fuel, the DF300AP/250AP is the first Suzuki outboard to utilize a water detecting fuel filter that alerts the operator with both visual and audio warnings when water is present in the fuel.
|MODEL||DF300AP *3 / DF250AP *3|
|RECOMMENDED TRANSOM HEIGHT mm||X:635, XX:762|
|WEIGHT kg *1||X: 290, XX: 299|
|ENGINE TYPE||DOHC 24-Valve|
|FUEL DELIVERY SYSTEM||Multi-Point Sequential Electronic Fuel Injection|
|NO. OF CYLINDERS||V6 (55-degree)|
|PISTON DISPLACEMENT cm3||4,028|
|BORE ×STROKE mm||98 x 89|
|MAXIMUM OUTPUT kW||DF250AP: 184.0, DF300AP: 220.7|
|FULL THROTTLE OPERATING RANGE rpm||DF250AP: 5,500-6,100, DF300AP: 5,700-6,300|
|OIL PAN CAPACITY Lit.||8.0|
|ENGINE MOUNTING||Shear Mount|
|TRIM METHOD||Power Trim and Tilt|
|GEAR SHIFT||F-N-R (Drive-by-wire)|
|EXHAUST||Through Prop Hub Exhaust|
PROPELLER SELECTION (Pitch)*2
All propellers are the 3-blade type
*1:Dry weight: not including propeller and engine oil,
*2:Please inquire at your local dealer for details of the propeller, *3:Suzuki Selective Rotation
The appearance, colors, and equipment of outboard motors may differ according to market and grade.
Specifications may change without prior notice.