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DF250SS PRODUCT INFORMATION
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DF250SS Main Features
I The DF250SS is designed to deliver performance and reliability that today’s sport users
demand.
I 4.0-liter Big Block V-6 engine–combined with Suzuki’s Variable Valve Timing (VVT) and Multi
Stage Induction delivers superior acceleration throughout the entire powerband.
I The 20-inch transom is perfect for bass boats, sport pontoon boats, ski boats, flats and bay
boats or any boat that is designed for the sportsman who is serious about outboard
performance.
I Gear case features a hydrodynamic design, introduced first on the flagship DF300, that
reduces drag resistance for fast acceleration and increased top speed.
I The DF250SS complies with the California Air Resources Board's (CARB) 2008 exhaust
emission standard and has earned the 3-Star Ultra Low Emission Rating.
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DF250SS PRODUCT INFORMATION
Suzuki Technologies Deliver Outstanding Performance
VVT (Variable Valve Timing)
with VVT
Suzuki engineers started o in a big way by designing the
DF250SS based on a big block 4.0-liter engine, the largest displace-
ment found in this class. €is V6 engine features an aggressive cam
proÞle, delivering maximum output and performance at high rpm,
and Suzuki’s advanced Variable Valve Timing (VVT), provides the
DF250SS with the torque needed to boost low- to mid-range
acceleration. VVT provides this boost by adjusting the intake valve
timing, allowing intake valves to open before the exhaust valves are
fully closed. €is process creates a momentary overlap in the
timing where both sets of valves are open. With VVT, this overlap
can be increased or
without VVT
Advance
decreased by altering
40° Movable Angle
intake timing with the
Intk Valve
Retard
Ex Valve
camshas to optimize
timing for low- and
mid-range operation.
LOW
MID
HIGH
ENGINE SPEED
Crank Angle
Valve Overlap
Diagram of VVT Mechanism
VVT Actuator
Rotation Direction
Intk Camshaft
Camshaft Position Sensor
Intk Camshaft
Ex Camshaft
Crankshaft
Retard
Advance
Crankshaft Position Sensor
Oil
Pump
Oil
Filter
Drain
ECM
Crank
Position
Duty Control
Throttle Opening Angle
Throttle Sensor
Target
Advance
Water Temp
Oil Control Valve (OCV)
Water Temp Sensor
Oil Pan
Cam Position
Manifold Pressure
Feed
back
Map Sensor*
Actual Valve
Engine Oil Flow
Signal
Timing
*Manifold Absolute Pressure Sensor
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Torque Curve
Multi-Stage Induction
Suzuki engineers also utilized Suzuki’s Multi-Stage Induction,
which changes intake manifold pipe length according to engine rpm
to enhance engine performance. e DF250SS utilizes two intake
manifold pipes per cylinder; one operates at low engine rpm and
the other takes over at higher rpm. During low engine rpm, air
enters the combustion chamber through the longer, curved mani-
fold pipe. e particular length of this pipe allows just the right
amount of fresh air into the chamber to improve combustion and
boost low-end torque.
with Multi-Stage Induction
without Multi-Stage Induction
As engine rpm increases, a valve on the intake manifold opens,
letting air enter directly
into the combustion
chamber through the
short, straight intake pipe.
is allows a greater
volume of air into the
chamber, increasing the
engine’s ability to breathe
LOW
MID
HIGH
ENGINE SPEED (rpm)
at high rpm, thus
improving high-end
power output.
Forged Pistons
e upper portion of each piston used in the DF250SS is treated
with an alumite coating that increases heat resistance. A resin
coating applied to the piston skirt improves resistance to wear and
Multi-Stage Induction Module
Air Flow in Multi-Stage Induction Module
reduces friction.
Alumite coating
Lower rpm
High rpm
Close
Open
Piston
Resin coating
Fuel Cooler
e cooler the fuel the denser it is, and the denser it is, the
more performance it delivers. e DF250SS incorporates a water -
cooled fuel rail in the fuel delivery system. e fuel is cooled before
it is injected into the cylinder resulting in better combustion and
better performance.
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DF250SS PRODUCT INFORMATION
Suzuki’s Advanced Engineering Delivers Compact Designs
Offset Driveshaft
Two-Stage Cam Drive System
Suzuki incorporates a number of innovative designs into its
outboards. As a result, Suzuki o!ers some of the most compact
outboards in their class. One such design innovation is the o!set
drivesha".
e DF250SS incorporates Suzuki’s proven two-stage cam drive
system that uses both gears and chain. e Þrst stage gears transfer
power between the cranksha" and the drive sha". While the
second stage transfers power from the drive sha" to the cam sha"s
Positioning the cranksha" in front of the drivesha", the
outboard’s center of gravity is moved forward. is contributes to
the overall compact size and provides improved power and
performance. It also greatly reduces engine vibration since the
engine’s axis of inertia, the point where vibrations are at a
minimum, is in line with the upper engine mounts.
with a chain. is system allows use of smaller diameter cam
sprockets, which in turn allow for a reduction in valve angles also
reducing the size of
the cylinder head.
Additionally, the
timing chain system
incorporates an
automatic hydraulic
tensioner to keep the
chain properly
Offset Drive Shaft
adjusted and provide
years of
maintenance-free
operation.
Streamlined Gear Case
e DF250SS takes advantage of the streamlined gear case
introduced on the DF300 to reduce drag created as the lower unit
moves through the water. is contributes to faster acceleration
and increased speed.
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Guarding Against the Elements
Acrylic Resin Clear Topcoat
Suzuki’s Anti-Corrosion Finish
e outside of the DF250SS is covered with Suzuki’s multi-
layered anti-corrosion Þnish that is specially formulated to increase
the durability of the engine and help protect the aluminum exterior
that is constantly exposed to saltwater. is advanced Þnish o€ers
maximum bonding of the Þnish to the outboard’s aluminum
surface, creating an e€ective treatment against corrosion.
Acrylic Resin Black
Metallic Basecoat
Epoxy Primer
Undercoat
Suzuki Anti-
Corrosion Finish
Suzuki Aluminum Alloy
Large Air Intake, and Flywheel with
Fan Blades
Air Intake
Increasing airßow into the engine can increase power output, so
Suzuki engineers designed the DF250SS with dual air induction
ports to maximize airßow into the
engine to obtain maximum power
output. e increased airßow delivers
more low- to mid-range torque and
provides the outboard with a wider
powerband.
e ßywheel is designed with fan
blades that expel heat from within the
engine cover and discharge the hot air
out of the side of the cowl, keeping the
temperature within the cowl under control.
Flywheel Magneto
Fuel Filter with Water Separator
e fuel system incorporates a large, easy to maintain fuel Þlter
that removes contaminants from the fuel before they can reach the
engine. A water separator built into the fuel Þlter o€ers a height-
ened level of protection by keeping water out of the engine.
Fuel Filter
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DF250S PRODUCT INFORMATION
Suzuki’s Advanced Electronics Optimize Performance
32-Bit ECM and Suzuki’s Multi Point Sequen-
tial Electronic Fuel Injection
Regulator with Dual Circuit Charging System
e DF250SS features a built in dual circuit charging system
that can be adapted* for use with dual-battery conÞgurations.
When used in this conÞguration, the system charges both main and
auxiliary batteries simultaneously on independent circuits. With
this design, you can drain down the accessory battery powering
your electronics and still have a fully charged main battery for
Suzuki pioneered the use of multi point sequential electronic
fuel injection in four-stroke outboards with the introduction of the
DF60 and DF70–the Þrst four-stroke outboards designed with
multi point sequential electronic fuel injection. At the heart of the
DF250SS is a multi point sequential fuel injection system which is
operated by an ECM (Engine Control Module) using a series of
engine sensors to constantly monitor crucial data, in real time. is
comprehensive network of sensors includes the Manifold Absolute
Pressure Sensor, Cranksha! Position Sensor, Intake Air Tempera-
ture Sensor, Cylinder Wall Temperature Sensor, Camsha! Position
Sensor, and Exhaust Jacket Temperature Sensor. Using a powerful
32-bit computer, the ECM processes data from all of these sensors
and instantly calculates the optimum amount of fuel to be injected
at high pressure into each cylinder.
starting the motor.
* Requires purchase of optional wiring harness.
Regulator
SINGLE CHARGING SYSTEM
Engine
Load
Fuse Box
Magneto
Main
Battery
Regulator
Regulator
BeneÞts of this system include reduced
exhaust emissions, which allow the
DUAL CHARGING SYSTEM
DF250SS to comply with CARB 3-Star
emission requirements, lower fuel
consumption, smoother starts, crisper
Engine
Load
Fuse Box
Magneto
Main
Auxiliary
Battery
Battery
Regulator
acceleration, impressive performance,
and maximum e"ciency.
High Output Alternator
e DF250SS generates electricity from a high output alternator
that delivers 54A (12V) of electrical power. Suzuki’s design allows
the alternator to produce a majority of its output at low rpm, so
even when operating at 1000rpm it can produce approximately
38A of power. In most situations, this is enough power to keep an
assortment of electronics up and running.
Direct Ignition System
Supplying spark to the DF250SS is an advanced ignition system
that utilizes integral type spark plug caps with built-in ignition
coils. e system is controlled by the outboard’s powerful 32-bit
computer and provides each cylinder with optimum spark timing.
In addition to reducing the number of
(A)
55
50
45
40
35
30
25
20
15
10
5
parts and simplifying the wiring
system, this arrangement greatly
reduces electronic engine “noise” that
can interfere with VHF radios, Þsh
Þnders, and other marine electronics.
Plug Top
Ignition Coil
0
1000
2000
3000
4000
5000 (rpm)
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Features that Offer Convenient Operation
Dual Engine Flush Ports
Tilt Limit Switch
e buildup of sand and salt in the engine’s cooling system can
lead to engine damage. To aid in reducing such buildup, the
DF250SS is designed with two freshwater ßush ports that make
ßushing of the cooling system as convenient and easy as possible.
With one port located on the rear panel and the second on the
front panel, access is easy and ßushing out the system is possible
whether the boat is in the water or on the trailer.
e outboard tilt system
incorporates an adjustable tilt limit
switch, which prevents the motor
from tilting beyond a predetermined
position. is can be used to protect
both the boat and motor from
damage that can occur when tilting
the motor.
Tilt Limit System
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DF250SS PRODUCT INFORMATION
Genuine Suzuki Parts and Accessories
Genuine Suzuki Parts and Accessories are your key to total perfor-
mance and boating satisfaction. Suzuki controls and gauges give boaters
the power and information they need to master any day on the water. We
o!er a full line of premium quality stainless steel props speciÞcally
engineered to maximize the performance and fuel e"ciency of Suzuki
4-stroke outboards. And you can rely on genuine Suzuki fuel and oil
Þlters, engine oil and gear oil. Suzuki Marine 4 Cycle Engine Oil o!ers
your outboard the Ultimate in performance and protection. Our engine
oil meets the advanced NMMA FC-W certiÞcation, providing superior
lubrication and the industries most complete panel of anti-corrosion
additives and rust inhibitors.. e Suzuki Modular Instrument System
uses an easy to connect and expandable cable system to transmit graphic
and numerical data to Multi-Function gauges. Easy to set up and
install, these SMIS Multi-Function Gauges display real-time
readings that monitor all engine functions. ese gauges are
also NMEA 2000 compatible, and with the simple push of a
few buttons, access to a wealth of vital data is
right at your Þngertips. Here at Suzuki Marine,
we have what you need to keep your Suzuki
outboard running strong season a#er season.
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DF250SS SPECIFICATIONS
DIMENSIONS
MODEL
DF250SS
FORWARD
ENGINE TYPE
4-Stroke DOHC 24 Valve
Multi Point Sequential
Electronic Fuel Injection
FUEL DELIVERY SYSTEM
TRANSOM HEIGHT mm (in.)
STARTING SYSTEM
WEIGHT kg (Ibs.)*
508mm / 20 in.
Electric
262kg / 578lbs
V6 (55-degree)
NO. OF CYLINDERS
PISTON DISPLACEMENT
cm3 (cu.in.)
4,028 (245.6)
BORE x STROKE mm (in.)
MAXIMUM OUTPUT kW
FULL THROTTLE
OPERATING RANGE rpm
98 x 89 (3.81 x 3.46)
184kw / 250 hp
5300-6300
286 (11.3) 286 (11.3)
458 (18)
458 (18)
633 (24.9)
139 (5.5)
1048 (41.3)
742 (29.2)
STEERING
Remote
OIL PAN CAPACITY l
(U.S. / Imp. qt.)
8.0 L / 8.5 U.S. qt. / 7.0 Imp qt.
IGNITION SYSTEM
Fully-transistorized
ALTERNATOR
ENGINE MOUNTING
TRIM METHOD
GEAR RATIO
12V 54A
Shear Mount
Power Trim and Tilt
2.08 : 1 Final Drive Ratio
F-N-R
GEAR SHIFT
EXHAUST
DRIVE PROTECTION
Through Prop Hub Exhaust
Rubber Hub
3 x 15-1/2 x 17
3 x 15-1/4 x 19
3 x 14-3/4 x 21
3 x 14-3/4 x 23
3 x 14-1/2 x 25
3 x 14-1/2 x 27
4 x 14-1/2 x 28
4 x 14-1/2 x 29
4 x 14-1/2 x 30
4 x 14-1/2 x 31
4 x 14-1/2 x 32
3 x 16 x 17
3 x 16 x 18.5
3 x 16 x 20
3 x 16 x 21.5
3 x 16 x 23
3 x 16 x 24.5
3 x 16 x 26
3 x 16 x 27.5
PROPELLER SIZE (in.)
3 or 4-BLADE STAINLESS
STEEL TYPE (OPTIONAL)
6˚
UNIT: mm (inch)
* The weight of the motors are “Dry-Weight”, not including propeller.
* Boats and motors come in a large variety of combinations. See your authorized dealer for correct prop.
selection to meet recommended RPM range at W.O.T.
Please read your owner’s manual carefully. Remember, boating and alcohol or other drugs don’t mix. Always
use a personal flotation devise. Please operate your outboard safely and responsibly.
Suzuki encourages you to operate your boat safely and with respect for the marine environment.
SUZUKI MOTOR CORPORATION reserves the right to change, without notice or obligation, equipment,
specifications, colors, materials and other items to apply to local conditions.
Each model may be discontinued without notice. Please inquire at your local dealer for details of any such
changes.
CARB Three-Star Label
The three-star label identifies engines that meet
the California Air Resources Board’s 2008
exhaust emission standards. Engines meeting
these standards have 65% lower emissions than
EPA 2006 exhaust emission standards.
Actual body colors may differ slightly from the colors in this brochure.
DF250S Product Information 0705
99999-C2049-101
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