Suzuki DF150, DF17 User Manual

Fresh Ideas, Advanced Technology and Innovative
Design Keep Suzuki Ahead of the Competition

Unrivaled expertise, world-class technology, innovative ideas and design… That’s an
excellent summary of what you can find in Suzuki’s line of four-stroke outboards, and
the new DF150 and DF175. At Suzuki, our goal has always been to provide boaters
with the power to get the most enjoyment from their
boating experience. To that end, we have
employed outside-the-box thinking, cutting
edge technology, and refined designs to
develop a line of four-stroke outboard
motors unmatched by the competition.
In so doing, Suzuki built the first four­stroke outboard with digital electronic
fuel injection; created the first four­stroke outboard with a self-adjusting
and maintenance-free timing chain;
developed the first use of an offset
drive shaft with two-stage mixed cam
drive; and designed and built the world’s
first 250 horsepower V6 four-stroke
outboards.

Our commitment to new and better
ideas has earned us the respect of the
industry and acclaim from satisfied
customers. As proof, Suzuki has been
awarded four NMMA awards for outboard
innovation, not to mention the three “Editors
Choice” awards from Motorboating Magazine.

Now we are building on this heritage. Our new
DF150 and DF175 four-stroke outboards are the
most powerful four-cylinder outboards we have
ever built. These new -compact and lightweight
outboard motors provide the benefits of fuel
efficiency and low emissions. More importantly, they
expand on the potential of four-stroke power for
marine applications by delivering powerful accelera­tion, quick throttle response and exhilarating top­end speed.

DF175

DF150

1

Big Block – High Performance Engine

Suzuki’s DF150 and DF175 are based

on an all-new inline four-cylinder DOHC

powerhead with a 2,867cm3 (174.9 cu.in.)

displacement—the largest to date in the

four-stroke, four-cylinder category.

While the added displacement contrib-

utes greatly to exceptional acceleration

and velocity, it doesn’t mean that these

engines are comparatively larger and

heavier in size. To the contrary, Suzuki’s

engineers have targeted these big block

motors to be the lightest four-strokes of

their kind.

Taking advantage of advances Suzuki

engineers have made in four-stroke

engine performance, the DF175 utilizes a

continuously variable valve timing system

much like that found in our flagship

DF250. Both the DF150 and DF175

share other advanced features including

multi-stage induction and a 32-bit

onboard computer that monitors and

controls engine functions. Both outboards

have also gained the CARB Three-Star

rating, which identifies engines that meet

the California Air Resources Board’s

2008 exhaust emissions standards.

2

■ Advanced Technology for the

Torque Curve

Performance

Largest Displacement in Their Class

The new DF150 and DF175 utilize an all-new inline four­cylinder four-stroke engine with a DOHC four-valve powerhead
that produces 150hp (110kW) and 175hp (129kW) respectively.
At 2,867cm3 (174.9 cu.in.), these two outboards offer the largest
displacement in the four-stroke, four-cylinder category to date.
And thanks to Suzuki’s innovative engineering, they are the
lightest in their category to date.

VVT (Variable Valve Timing) (DF175)

In designing the DF175, our goal was to expand the potential of
the four-stroke engine and create an outboard that delivers high
performance along with the benefits of four-stroke technology.

Like the flagship DF250, the DF175 is designed with an
aggressive cam profile and paired with Suzuki’s advanced Variable
Valve Timing (VVT) to increase the low to mid-range torque
outboards need when accelerating. The intake valve actually starts
to open before the exhaust valve fully closes, creating a momen­tary overlap in the timing where both valves are open. Using
Variable Valve Timing, this overlap can be increased or decreased
by altering intake timing with the camshaft, thereby optimizing
camshaft timing for low and mid-range operation.

with VVT

TORQUE

LOW MID

* At the comparison test, Multi-Stage Induction System of the

motor was operated.

without VVT

HIGH

ENGINE SPEED

Air Flow in Multi-Stage Induction Module

Lower rpm

High rpm

Multi-Stage Induction (MSI)

The DF150 and DF175 incorporate a multi-stage induction
system to enhance engine performance by changing the length of
intake manifold pipes according to engine speed. The system
utilizes two intake manifold pipes per cylinder, one for operating
at low engine speed and another for operating at high. At lower
rpm, air enters the combustion chamber through the longer mani­fold pipe, which is designed to deliver an optimum volume of
fresh air into the chamber to improve combustion and boost low­end torque.

As the engine speed surpasses a preset threshold, the valve on
the direct intake pipe opens up, letting air enter instantly into the
combustion chamber. Shorter and lacking resistance, this pipe gets
a greater volume of air into the chamber, increasing the engine’s
ability to breathe at high rpm, thus improving high speed power
output.

Suzuki engineers have equipped these outboards with many
other advanced features that contribute to engine performance.

A spherical bore throttle body produces smoother airflow
during acceleration. This results in greater engine control and
stable operation at low rpm.

Torque Curve

TORQUE

Torque 

(with Multi-Stage Induction)

(without Multi-Stage Induction)

Torque 

LOW MID

ENGINE SPEED

HIGH

3

■ Smooth Operation

■ Durability and Reliability

Counter Balancer System

In-line four-cylinder engines operating at high RPMs
generate a secondary vibration that is directionally in line with
the pistons’ movement. In order to counter this vibration, Suzuki
engineers utilize a secondary balancer system, which produces a
horizontal motion against pistons’ movement. To produce this
horizontal motion, the balancer is divided into left and right
sections, each rotating in an opposite direction. Rotating at twice
the speed of the crankshaft, the balancers effectively counter
these secondary vibrations and produce a smoother operating
engine.

Thrust Mount System

In order to reduce vibration and provide stable operation,
the DF150 and DF175 use a combination of two different
rubber mount types. On both the upper and lower mounts, a
combination of soft type and high thrust rubber mounts are
utilized. The soft rubber mounts used in this configuration
are designed to absorb vibrations produced in the idling
through 2,000 rpm operating range. While adding to the
compact design and providing an improvement in power and
performance, this system also places the high thrust rubber
mounts in the best position to provide stable operation under
high loads.

Offset Drive Shaft

Suzuki’s offset drive shaft has proven successful in
reduction of size for the DF90, DF115, DF140, DF200,
DF225, and DF250. The DF150 and DF175 benefit from this
same design, which positions the crankshaft in front of the
drive shaft, simultaneously moving the outboard’s center of
gravity forward. While adding to the compactness of the
outboard and providing an improvement in power
performance, this system also places the engine’s axis of
inertia, the point where vibrations produced by the engine are
at a minimum, up over the upper engine mount thus, greatly
reducing vibration.

Suzuki’s Anti-Corrosion Finish

Suzuki’s anti-corrosion finish is specially formulated
to increase the durability of the engine and protect those
parts of the aluminum exterior that are constantly exposed
to saltwater. Applied directly to the outboard’s aluminum
alloy, this advanced finish provides maximum bonding of
the outboard’s finish to its aluminum surface. Layered on
top is an epoxy primer
undercoat, black
metallic finish, and
clear acrylic fiber
finish that together
form an effective
treatment against
corrosion.

Acrylic Resin Black
Metallic Basecoat

Epoxy Primer
Undercoat

Acrylic Resin Clear Topcoat

Suzuki Anti­Corrosion Finish

Suzuki Aluminum Alloy

Enhanced Air Intake System

Maximizing airflow into the engine is one way to gain
maximum power output. The DF150 and DF175 are designed
with a large air induction port to increase airflow into the
engine. Air is channeled into a large silencer, then through
the intake manifold, and finally into the cylinders via a high
performance DOHC four-valve-per-cylinder head. The
increased airflow results in more low- to mid-range torque
and provides a wide powerband that is a must in an outboard
engine. The system also includes a water separator which
keeps water out of the air intake system.

Offset Drive Shaft

Quietness

Comparison

The DF150 and DF175
are powerful outboards, but
powerful doesn’t mean that
they are noisy. Quiet opera-

100

Brand A (2st D/I 175PS)

90

tion has long been an
integral part of Suzuki four­stroke outboard design.

A comparison of engine
operating noise levels

80

dB

70

DF175

between the four-stroke
DF175 and its two-stroke

60

direct fuel injection (D/I)
counterpart is shown in the
graph. In this comparison it
is clear that the DF175

50

LOW

*According to Suzuki Internal Running Test

rpm

MID

delivers quieter operation
over its entire range than its two-stroke counterpart.

HIGH

4

■ Advanced Electronics

32-Bit ECM (Engine Control Module)

The ECM (Engine Control Module) allows much more
accurate control over the motor’s operation, particularly
the engine’s ignition and fuel delivery systems. The DF150
and DF175 rely on a powerful 32-bit computer in the ECM
to monitor and process crucial data, in real time, from a
series of sensors placed in critical areas on the engine. This
comprehensive network of sensors includes the Manifold
Absolute Pressure Sensor, Crankshaft Position Sensor,
Intake Air Temperature Sensor, Shift Position Sensor,
Throttle Position Sensor, Cylinder Wall Temperature
Sensor, Camshaft Position Sensor, and Exhaust Jacket
Temperature Sensor. Processing this data in real time, the
computer controls the engine’s ignition system and pro­vides an ideal fuel supply under all operating conditions.

Multi Point Sequential Electronic Fuel Injection

Fuel Tank

Low Pressure Fuel Filter

Multi-Point Sequential Electronic Fuel
injection

As Suzuki was the first outboard motor manufacturer
to incorporate multi-point sequential fuel injection in a
four-stroke outboard, it is only natural that the DF150
and DF175 would utilize the same. The system injects
the optimum amount of fuel at high pressure into each
cylinder according to commands from the ECM’s 32-bit
computer. Along with saving fuel, the system enables the
DF150 and DF175 to meet the world’s strictest emissions
regulations—CARB 2008—and pass the EPA’s 2006
regulations. Other benefits include quick starts, crisp
acceleration, smooth performance, and maximum effi­ciency.

Battery

Shift Position Sensor

Neutral Switch

IG

ST

Ignition
Switch

OFF

ECM

Starter Relay

Fuse

Squeeze Pump

Low Pressure Fuel Pump

Main Relay

Vapor

Separator

Evaporation Hose

Vacuum Switching 
Valve (VSV)

Silencer

Intake Air Temp Sensor 
(IAT Sensor)

Throttle Position Sensor

Float

Pressure Regulator

Intake Manifold

Idle Air Control 
Valve (IAC Valve)

Throttle Body

Adjust Screw

Pilot Air

Pressure

Fuel Filter

High Pressure
Fuel Pump

Fuel Cooler

Injector

High

Crankshaft Position 
Sensor (CKP Sensor)

Oil Control Valve (OCV)

Ignition Coil

Camshaft Position 
Sensor (CMP Sensor)

Cylinder Head

Spark Plug

Oxygen Sensor (Service tool only)

Cylinder Wall Temp Sensor

Manifold Absolute Pressure Sensor 
(MAP Sensor)

Flywheel
Magneto

Cylinder Block

Exhaust Jacket
Temp Sensor

5

High Output Alternators

The DF150 and DF175 are equipped with alternators
that produce a maximum output of 44A (12V) and are
capable of producing
almost 80% of their
total output at a low
1,000 RPM. In most
cases, that’s enough
power to keep an
assortment of electron­ics up and running.

Alternator Output

(A)

50

45

40

35

30

25

20

15

10

5

1000

0

2000

3000

4000

5000 6000

(rpm)

■ Designed with Convenience

Two Engine Flush Ports

Salt, sand, and dirt can buildup in the engine’s cooling
system, causing damage over time. The DF150 and DF175
are equipped with two freshwater flush ports to make
flushing of the cooling system as convenient as possible.
One port located on the port side of the down housing and
a second located on the front panel provide easy access
and facilitate flushing of the system whether the boat is in
or out of the water.

in Mind

Tilt Limit Switch

The motor tilt system incorporates a tilt limit switch
that prevents the motor from tilting beyond a predeter­mined point. The system can be set by the user and can be
used to protect both the boat and motor from damage that
can occur when tilting the motor.

Tilt Limit System

Water-cooled Voltage Regulator with
Isolator

Both outboards incorporate a water-cooled voltage
regulator which dissipates heat in the regulator to enhance
the engine’s durability.
The regulator also includes isolator function in the battery
charging system that allows use of two batteries. Electric
current is split into two circuits. If the sub battery becomes
drained, this system will safeguard the main battery.

Fuse Box

Fuses protecting the
outboard’s electric system
are assembled into a single
fuse box located on the
side of the outboard motor.
This configuration offers
convenient access and
creates a clean exterior.

Fuse Box

6

DF150/175 SPECIFICATIONS

MODEL DF150 DF175

ENGINE TYPE Four-Stroke DOHC 16 Valve
FUEL DELIVERY

SYSTEM
TRANSOM HEIGHT L: 508 (20)

mm (in.) X: 635 (25)

STARTING SYSTEM Electric

WEIGHT kg (Ibs.)

*Dry-weight, not including propeller

NO. OF CYLINDERS 4
PISTON DISPLACEMENT

cm3 (cu.in.)
BORE × STROKE

m/m (in.)
MAXIMUM OUTPUT

HP (kW)
FULL THROTTLE

OPERATING RANGE rpm

STEERING Remote
OIL PAN CAPACITY l

(U.S. / Imp. qt.)
IGNITION SYSTEM Fully-transistorized
ALTERNATOR 12V 44A
ENGINE MOUNTING Shear Mount
TRIM METHOD Power Trim and Tilt
GEAR RATIO 2.50 : 1 (Two-stage Reduction Gear)
GEAR SHIFT F.N.R
EXHAUST Through Prop Hub Exhaust
DRIVE PROTECTION Rubber Hub
PROPELLER SIZE (in.) 15-1/2 × 17

OPTIONAL 15-1/4 × 19

* Counter Rotation Model Available (Transom X only).

Multi Point Sequential Electronic Fuel Injection

L: 211 (465.2)
X: 215 (474.0)

2,867 (174.9)

97 × 97 (3.81 × 3.81)

150 (110)

175 (129)

5000-6000 5500-6100

8.0 (8.5/7.0)

14-3/4 × 21
14-3/4 × 23
14-1/2 × 25
14-1/2 × 27

DIMENSIONS

395.3
(15.6)

677.8 (26.7)

1036.8 (40.8)

167.6 (6.6)

353

78.5

(3.1)

671.3 (26.4)

(13.9)

14°

6°

30°

259.4

259.4

(10.2)

(10.2)

1157.6 (45.6)

1038.2 (40.9)

15°

30°

395.3
(15.6)

777.9 (30.1)

1840.6 (72.5)

1713.6 (67.5)

499.8

(19.7)

626.8 (24.7)

70°

48.5 (1.9)

47.8

(1.9)

Unit: mm (inch)

*

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 owners manual carefully. Remember,
boating and alcohol or other drugs don’t mix. Please operate
your outboard safely, responsibly and with respect for the
marine environment.

Equipment, specifications, colors, materials maybe subject
to change without notice.

Each model may be discontinued without notice. Please
inquire at your local dealer for details of any such changes.
Actual body colors may differ slightly from the colors in this
brochure.

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.

EPA 2006 Label

Suzuki’s four-stroke
technology ensure
compliance with EPA
2006 exhaust emission
standards set by the
U.S. Environmental
Protection Agency.

www.suzuki.com

Suzuki, the "S" logo, and Suzuki model names
are Suzuki trademarks or ®
DF150/175 Product Information (ASMC) 0504
99999-C2047-111 Printed in Japan