Suzuki DF300B User manual

1
EN
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ENGLISH
DF300B
DF325A
DF350A
OWNER’S MANUAL

2
IMPORTANT
8 WARNING/ 8 CAUTION/ NOTICE/ NOTE
Please read this manual and follow its instruc-
tions carefully. To emphasize special informa-
tion, the symbol 8and the words WARNING,
CAUTION, NOTICE and NOTE have special
meanings. Pay special attention to the mes-
sages highlighted by these signal words.
NOTE:
Indicates special information to make mainte-
nance easier or instructions clearer.
This symbol appears in various locations on
your Suzuki product to refer you to important
information in the owner’s manual.
IMPORTANT NOTICE TO
OWNERS
8 WARNING
Indicates a potential hazard that could result
in death or serious injury.
8 CAUTION
I ndicates a potential hazard that could result
in minor or moderate injury.
NOTICE
Indicates a potential hazard that could result
in damage to the motor or boat.
8 WARNING
Failure to take the proper precautions may
increase the risk of death or severe injury to
you and your passengers.
• Prior to first-time use of your outboard
motor, familiarize yourself thoroughly with
the contents of this owner’s manual. Be
aware of all outboard motor features and all
safety and maintenance requirements.
• Inspect the boat and motor before each trip.
See the INSPECTION BEFORE BOATING
section for important items.
• Become thoroughly familiar with all operat-
ing and handling characteristics of your
boat and motor. Practice at low and moder-
ate speeds until you are competent at han-
dling the boat and motor. Do not attempt to
operate at maximum performance until you
are completely familiar with all of these
characteristics.
• Carry boating safety and emergency equip-
ment. This important equipment includes;
flotation aids for each person (plus one
throwable buoyant cushion in any boat 16
feet or longer), fire extinguisher, sound sig-
naling device, visual distress signals,
anchor, bilge pump, bucket, compass,
emergency starter rope, extra fuel and oil,
first aid kit, flashlight, food and water, mir-
ror, paddles, tool kit, and transistor radio.
Be sure you are carrying the equipment
appropriate for your trip before launching.
• Never start the engine or let it run indoors
or where there is little or no ventilation.
Exhaust gas contains carbon monoxide, a
gas that is colorless and odorless and can
cause death or severe injury.
• Instruct your passengers on how to operate
the boat, how to deal with emergencies, and
how to operate safety and emergency
equipment.
• Do not hold onto the motor cover or any
other parts of your outboard motor while
getting on or off your boat.
• Ensure that everyone wears a PFD (Per-
sonal Flotation Device) on board.
• Never operate the boat while under the
influence of alcohol or other drugs.
• Distribute all weight load evenly in the boat.
• Have all scheduled maintenance performed.
Consult your authorized Suzuki marine
dealer as required.
• Do not modify or remove any outboard
motor standard equipment. To do so may
make the motor unsafe to use.
• Learn and obey all applicable navigation
rules.
• Pay attention to all weather forecasts. Do
not set out if weather is unsettled.
• Use extreme caution when purchasing
replacement parts or accessories. Suzuki
strongly recommends that you use only
genuine Suzuki replacement parts/accesso-
ries or their equivalent. Inappropriate or
poor quality replacement parts or accesso-
ries can create unsafe operating conditions.

3
NOTE:
Mounting radio transceiver or navigational
equipment antennae too close to the engine
cowling can cause electrical noise interference.
Suzuki recommends that antennae be mounted
at least one meter (40 inches) away from the
engine cowling.
• Never remove the flywheel cover (except for
when emergency starting).
This manual should be considered a per-
manent part of the outboard motor and
should remain with the outboard motor
when resold or otherwise transferred to a
new owner or operator. Please read this
manual carefully before operating your
new Suzuki and review the manual from
time to time. It contains important infor-
mation on safety, operation, and mainte-
nance.
FOREWORD
Thank you for choosing a Suzuki outboard
motor. Please read this manual carefully and
review it from time to time. It contains important
information on safety, operation, and mainte-
nance. A thorough understanding of the infor-
mation presented in this manual will help you
experience safe, enjoyable boating.
All information in this manual is based on the
latest product information available at the time
of publication. Due to improvements or other
changes, there may be discrepancies between
this manual and your outboard motor. Suzuki
reserves the right to make changes at any time
without notice.

4
TABLE OF CONTENTS
IDENTIFICATION NUMBER
LOCATION.............................................. 5
FUEL AND OIL....................................... 5
LOCATION OF SAFETY LABELS ..... 8
LOCATION OF PARTS......................... 9
MOTOR MOUNTING.......................... 11
BATTERY INSTALLATION .............. 11
USE OF ELECTRICAL
ACCESSORIES ..................................... 13
SUZUKI KEYLESS START SYSTEM
(IF EQUIPPED WITH KEYLESS
START SYSTEM) .................................... 14
PROPELLER SELECTION,
INSTALLATION AND REMOVAL ... 18
ADJUSTMENT...................................... 21
METER (OPTION)
MULTI-FUNCTION GAUGE ............. 23
CAUTION SYSTEM ............................. 35
ELECTRONIC THROTTLE AND
SHIFT CONTROL CAUTION
SYSTEM................................................. 39
KEYLESS START SYSTEM CAUTION
SYSTEM (IF EQUIPPED WITH
KEYLESS START SYSTEM)................... 43
DIAGNOSTIC SYSTEM ...................... 44
OIL CHANGE REMINDER
SYSTEM................................................. 45
ENGINE STALLING CAUTION
SYSTEM................................................. 47
WATER IN FUEL ALERT SYSTEM. 47
OPERATION OF TILTING
SYSTEMS............................................... 48
OPERATION OF MOTOR COVER
LEVER.................................................... 51
INSPECTION BEFORE BOATING ... 51
BREAK-IN ............................................. 53
OPERATION ......................................... 54
MOTOR REMOVAL AND
TRANSPORTING ................................. 70
TRAILERING........................................ 72
INSPECTION AND
MAINTENANCE................................... 73
FLUSHING THE WATER
PASSAGES............................................. 87
SUBMERGED MOTOR ....................... 90
STORAGE PROCEDURE ................... 91
AFTER STORAGE ............................... 92
TROUBLESHOOTING ........................ 92
SPECIFICATIONS ............................... 96
INFORMATION REGARDING
EC – DIRECTIVE ................................. 96
FLOWCHART OF OIL CHANGE
REMINDER SYSTEM.......................... 97

5
IDENTIFICATION
NUMBER LOCATION
The model and identification numbers of your
outboard motor are stamped on a plate
attached to the clamp bracket. It is important to
know these numbers when you place a parts
order or if your motor is stolen.
FUEL AND OIL
GASOLINE
DF300B/325A
Suzuki highly recommends that you use alco-
hol-free unleaded gasoline whenever possible,
with a minimum octane rating of 91 (Research
method). However, blends of unleaded gasoline
and alcohol with equivalent octane content may
be used, provided the guidelines that follow are
met.
DF350A
Suzuki highly recommends that you use alco-
hol-free unleaded gasoline whenever possible.
Premium gasoline is recommended, not
required. Minimum octane rating of 94
(Research method) is acceptable. However,
blends of unleaded gasoline and alcohol with
equivalent octane content may be used, pro-
vided the guidelines that follow are met.
NOTE:
Oxygenated fuels are fuels which contain oxy-
gen-carrying additives such as alcohol.
Suzuki recommends that you install a water-
separating fuel filter assembly between your
boat’s fuel tank(s) and outboard motor(s). Fuel
filtration systems of this type will help prevent
water that may be present in your boat’s fuel
tank(s) from contaminating your motor’s elec-
tronic fuel injection system. Water contamina-
tion can cause poor engine performance and
can also cause damage to the electronic fuel
injection system components.
Your Authorized Suzuki Marine Dealer can pro-
vide you advice about water-separating fuel fil-
ter systems and installation.
Gasoline/Ethanol Blends
Blends of unleaded gasoline and ethanol (grain
alcohol), also known as “GASOHOL”, are com-
mercially available in some areas. Blends of this
type may be used in your outboard motor if they
are no more than 10% ethanol. Make sure this
gasoline-ethanol blend has octane ratings no
lower than those recommended for gasoline.
Use the recommended gasoline which
conforms to the following labels.
78RB0900*
NOTICE
Use of leaded gasoline can cause engine dam-
age. Use of improper or poor quality fuel can
affect performance and may damage your
motor and fuel system.
Use only unleaded gasoline. Do not use fuel
having lower than the recommended octane,
or fuel that may be stale or contaminated by
dirt/water etc.
or

6
Pump Labeling for Gasoline/Alcohol
Blends
In some states, pumps that dispense gasoline/
alcohol blends are required to be labeled for the
type and percentage of alcohol content, and
whether important additives are present. Such
labels may provide enough information for you
to determine if a particular blend of fuel meets
the requirements listed above. In other states,
pumps may not be clearly labeled as to the con-
tent or type of alcohol and additives. If you are
not sure that the fuel you intend to use meets
these requirements, check with the service sta-
tion operator or the fuel suppliers.
NOTE:
If you are not satisfied with the operation or fuel
economy of your outboard motor when you are
using gasoline/alcohol blends, you should
switch back to unleaded gasoline containing no
alcohol.
Be sure that any gasoline/alcohol blend you use
has octane ratings of at least 94 octane
(Research method).
If engine pinging is experienced, substitute
another brand as there are differences between
brands.
Unleaded gasoline will extend spark plug life.
8 WARNING
Gasoline is extremely flammable and toxic. It
can cause a fire and can be hazardous to peo-
ple and pets.
Always take the following precautions when
refueling:
• Never permit anyone other than an adult to
refill the fuel tank.
• If you use a portable fuel tank, always stop
the motor and remove the fuel tank from the
boat to refill it.
• Do not fill the fuel tank all the way to the top
or fuel may overflow when it expands due to
heating by the sun.
• Be careful not to spill fuel. If you do, wipe it
up immediately.
• Do not smoke, and keep away from open
flames and sparks.
NOTICE
Gasoline kept in the fuel tank for long periods
of time will produce varnish and gum, which
can damage the engine.
Always use fresh gasoline.
NOTICE
Fuels containing alcohol can cause paint
damage, which is not covered under the New
Outboard Motor Limited Warranty.
Be careful not to spill fuel containing alcohol
while refueling. If fuel is spilled, wipe it up
immediately.

7
ENGINE OIL
Oil quality is a major contributor to your
engine’s performance and life. Always select
good quality engine oil.
Suzuki recommends the use of SAE 10W-40 or
10W-30 SUZUKI MARINE 4-CYCLE ENGINE
OIL. If SUZUKI MARINE 4-CYCLE ENGINE
OIL is not available, select a NMMA certified
FC-W oil or good quality 4-cycle motor oil from
the following chart according to the average
temperatures in your area.
NOTE:
In very cold weather (below 5°C (41°F)), use
SAE (or NMMA FC-W) 5W-30 for easier start-
ing and smooth operation.
GEAR OIL
Suzuki recommends the use of SUZUKI OUT-
BOARD MOTOR GEAR OIL. If it is not avail-
able, use SAE 90 hypoid gear oil which is rated
GL-5 under the API classification system.
NOTICE
Use of poor quality engine oil can adversely
affect engine performance and life.
Suzuki recommends that you use Suzuki
Marine 4-Cycle Engine Oil or its equivalent.
–20 –10 0 10 20 30
–4 14 32 50 68 86
40
104
TEMP.
API Classification SAE Viscosity Grade
10W–40
10W–30
˚F
˚C
SG
SH
SJ
SL
SM
SN
SP

8
LOCATION OF SAFETY LABELS
Read and follow all of the labels on your out-
board motor or fuel tank. Make sure you under-
stand all of the labels.
Keep the labels on your outboard motor or fuel
tank. Do not remove them for any reason.
WARNING AVERTISSEMENT
Label symbol meanings
These symbols mean as follows;
: General warning symbol
(Caution or Warning)
: Read owner’s manual carefully
: Remote control lever/gear shift lever
operation-two direction; Forward/
Neutral/Reverse
: Engine start
: Hazard caused by fire
: Hazard caused by laying the
motor on its side

• Fuel can leak creating a fire hazard if
you lay motor on its side. Drain fuel
completely from vapor separator or
carburetor before laying motor on its side.
• See owner’s manual for details.
• Le carburent risque de fuir et de
présenter un danger d’incendie si le
moteur est placé sur le côté.
Vidanger entièrement le carburant du
séparateur de vapeurs ou du
carburateur avant de procéder.
• Pour plus de détail, voir le manuel
du propriétaire.

9
LOCATION OF PARTS
Anode
Manual
release
screw
Anode
Anode
Pilot water hole
Engine oil
drain plug
Motor cover
Power trim and
tilt (P.T.T.) switch
Tilt limit cam
Flush plug
Flush plug
Anode
Front gear oil
level plug
Water intake
hole
Gear oil
drain plug
Auxiliary water
supply port
Transom XX
Auxiliary water
supply port
Auxiliary water
supply port
Anti-cavitation
plate
Clamp bracket
Rear gear oil
level plug
Water intake
hole
Water intake
hole

10
FUEL LINE
Priming bulb
SELECT
THROTTLE
ONLY
SELECT
THROTTLE
ONLY
MULTI-FUNCTION GAUGE
(Option)
KEYLESS FOB
(IF EQUIPPED WITH
KEYLESS START SYSTEM)
REMOTE CONTROL BOX (Option)
Type B
Type A
Select switch
Throttle only switch
Emergency stop switch
Power trim and tilt (P.T.T.) switch
Remote control handle
Throttle only switch
Select switch
Shift lock button

11
MOTOR MOUNTING
Suzuki strongly recommends that you have
your outboard motor, controls and gauges
installed by an authorized Suzuki Marine
Dealer. He has the tools, the facilities and the
know-how.
8 WARNING
Overpowering your boat can be hazardous.
Excessive horsepower will have an adverse
effect on hull safety and may cause operating/
handling difficulties. The boat may also sus-
tain stress and hull damage.
Never install an outboard motor with horse-
power exceeding the manufacturer’s recom-
mended maximum horsepower listed on the
boat’s “Certification Plate”. Contact your
authorized Suzuki marine dealer if you are
unable to locate the hull “Certificate Plate”.
8 WARNING
Failure to have your outboard motor and asso-
ciated controls and gauges properly installed
can result in personal injury or damage.
Suzuki strongly recommends that you have
your outboard motor, controls and gauges
installed by your authorized Suzuki marine
dealer. He has the tools, the facilities, and the
know-how to do the job correctly.
BATTERY INSTALLATION
BATTERY REQUIREMENTS
Do not use deep cycle batteries and gel-cell
batteries for starting engines.
Use a 12 Volt starting-type lead acid battery
that meets the specifications shown below.
1000 Marine Cranking Amps (MCA)/ABYC,
or 800 Cold Cranking Amps (CCA)/SAE
or 180 Reserve Capacity (RC) Minutes/SAE
NOTE:
• The specifications listed above are the mini-
mum battery rating requirements for starting
the engine.
• When connecting batteries in parallel, they
must be of the same type, capacity, manufac-
turer, and of similar age. When replacement
is necessary, they should be replaced as a
set. Consult your Suzuki dealer for proper
battery installation information.
• If your boat application requires additional
battery loads, it is recommended that an aux-
iliary battery or batteries be installed. Consult
your Suzuki dealer for proper battery installa-
tion information.

12
BATTERY INSTALLATION
Secure the battery in a dry area of the boat,
away from vibration.
NOTE:
• It is recommended that the battery be
installed in an enclosed battery case.
• When connecting batteries, hexagon-nuts
must be used to secure battery leads to bat-
tery posts.
To hook up the battery, first connect the red
lead from the motor to the positive battery ter-
minal, then connect the black lead to the nega-
tive battery terminal.
To remove the battery, first disconnect the black
lead from the negative terminal, then discon-
nect the red lead from the positive terminal.
Suzuki recommends that you install the termi-
nal cap on the positive battery terminal to pre-
vent an accidental short circuit of battery
terminals.
If a terminal cap is required, contact your autho-
rized Suzuki marine dealer.
Black
lead
Sub battery
cable
White lead
Red lead
Hexagon-nut
8 WARNING
If you place the battery near the fuel tank, a
spark from the battery may ignite the gaso-
line, causing a fire and/or an explosion.
Do not place the fuel tank in the same com-
partment/area as the battery.
8 WARNING
Batteries produce flammable hydrogen gas
and may explode if they are near flames or
sparks.
Never smoke or cause sparks when working
near the battery. Keep the battery away from
open flames. To avoid creating a spark when
charging the battery, connect the battery char-
ger cables to the proper terminals before turn-
ing the charger on.
8 WARNING
Battery acid is poisonous and corrosive. It
can cause severe injury and can damage
painted surfaces.
Avoid contact with eyes, skin, clothing, and
painted surfaces. If battery acid comes in con-
tact with any of these, flush immediately with
large amounts of water. If acid contacts the
eyes or skin, get immediate medical attention.
NOTICE
The electrical system or its components may
be damaged if proper battery precautions are
not followed.
• Be sure to attach battery leads correctly.
• Do not disconnect battery leads from the
battery while the engine is running.

13
SUB BATTERY CABLE
The sub battery cable 1is used to supply volt-
age to the engine control system. In the midst
of the cable, a 30 A fuse 2is provided to pro-
tect the control circuit.
If the sub battery cable is not correctly con-
nected to the battery, engine cannot be started.
DUAL BATTERY CHARGING SYSTEM
(OPTION)
If installing the battery isolator lead assembly,
available as optional parts, and changing the
position of 40 A fuse from standard to option,
dual battery charging system will be effective.
Be sure to check if the optional 40 A fuse in
OPT position is blown, when the second battery
for accessories will not be charged.
Please ask your authorized Suzuki Marine
Dealer for installation of the isolator lead
assembly.
USE OF ELECTRICAL
ACCESSORIES
The amount of power (DC12V) available for
accessories, however, depends on the operat-
ing condition of the motor. For getting a detailed
information, please inquire of your authorized
Suzuki Marine Dealer.
NOTE:
Use of too much power for electrical accesso-
ries under certain operating conditions can
cause the battery to discharge.

14
SUZUKI KEYLESS START
SYSTEM
(IF EQUIPPED WITH
KEYLESS START SYSTEM)
This system allows you to start the engine by
means of communication between the keyless
fob and the keyless control unit when you have
the keyless fob with you, instead of using the
mechanical key.
The engine can be started when the distance
between the keyless fob and the keyless control
unit is within the communication range of 1 m
(40 in).
In this system, the keyless fob and the keyless
control unit uses radio communication to check
if the keyless fob ID is registered in the Keyless
Start System.
If the keyless fob ID is not registered, the sys-
tem prevents the engine from starting using the
keyless fob.
NOTE:
Please consult with a Suzuki Marine Dealer for
the installation of the Keyless Start System.
Also refer to the “Keyless Start System Instruc-
tion Manual” supplied with the product for
detailed operating instructions.
IMMOBILIZER SYSTEM
In this system, the keyless fob and the keyless
control unit uses radio communication to check
if the keyless fob ID is registered in the Keyless
Start System.
If the keyless fob ID is not registered, the sys-
tem prevents the engine from starting using the
keyless fob.
Keyless fob
Keyless control unit
KEYLESS FOB
Two (2) keyless fobs are supplied with the Key-
less Start System.
NOTE:
The keyless fob falls under the category of
restricted electronic devices for use in flight.
8 WARNING
Radio waves from the keyless control unit
may interfere with the operation of electrical
medical equipment such as pacemakers. Fail-
ure to take the precautions listed below can
increase the risk of severe injury or death due
to radio wave interference.
Anyone who uses electrical medical equip-
ment such as a pacemaker should consult the
medical equipment supplier to inquire if radio
waves from the keyless control unit can inter-
fere with the medical equipment.
8 WARNING
The keyless fob emits radio waves that may
interfere with aircraft operations.
Do NOT operate the buttons on the keyless
fob while you are in flight. When putting the
keyless fob in a bag, etc., protect the buttons
from accidently being pressed.

15
NOTICE
The radio waves emitted from the keyless fob
may cause interference with other wireless
communication devices such as mobile
phones and remoter controllers.
Do not operate the buttons on the keyless fob
more than necessary.
8 CAUTION
Attempting to disassemble (except for battery
replacement), repair, or modify the keyless fob
may cause ignition, electric shock, or injury.
Do NOT attempt to disassemble (except for
battery replacement), repair, or modify the
keyless fob.
NOTICE
The keyless fob is comprised of sophisticated
electronic components that can become dam-
aged and may fail to function properly if you
do not take proper precaution.
• Do NOT leave it in places that may reach a
high temperature.
• Do NOT apply a strong impact, such as
dropping it.
• Do NOT bring it close to any magnetic
objects.
• Do NOT place it near any electro-magnetic
devices such as a television or audio equip-
ment.
• Do NOT place it near any electric medical
equipment (microwave therapy equipment,
low frequency therapy equipment, etc.), or
receive medical treatment with the keyless
fob in your pocket, etc.
NOTE:
• Do NOT erase or tamper with the confor-
mance certification mark.
• A maximum of six (6) keyless fobs can be
registered in one keyless control unit.
• The battery life of the keyless fob is about two
(2) years, which can vary depending on use.
• The keyless fob is always in transmission
mode in order to communicate with the key-
less control unit. For this reason, the battery
may run down quickly if it receives strong
radio waves from televisions or personal
computers, etc.
NOTE:
• If the keyless fob is lost, immediately contact
your authorized Suzuki Marine Dealer.
• The keyless fob uses a weak radio wave that
is susceptible to external influences when it
communicates with the keyless control unit.
For this reason, it may not operate properly
under the following use environment.
– There is a nearby facility that emits strong
radio waves such as a television tower,
electric power plant, or broadcasting sta-
tion, etc.
– The keyless fob is held close to other wire-
less communication devices such as
mobile phone, radio equipment or a laptop
personal computer.
– The keyless fob is in contact with or cov-
ered with a metallic object.

16
Switching the communication mode of
the keyless fob
Press and hold the lock button 1on the key-
less fob for more than one second to switch
between ON mode and OFF mode.
ON mode:
The Keyless Start System can be used.
OFF mode:
The Keyless Start System cannot be used.
NOTE:
If the lock button is pressed briefly while in com-
munication ON mode, the LED 2on the key-
less fob briefly flashes once.
KEYLESS FOB BATTERY REPLACEMENT
8 WARNING
This product contains a coin/button cell bat-
tery. If swallowed, the coin/button cell battery
can cause severe internal burns in just 2
hours and may lead to death.
• THE BATTERY IS A CHEMICAL BURN HAZ-
ARD. DO NOT INGEST THE BATTERY. If you
think batteries might have been swallowed
or placed inside any part of the body, seek
immediate medical attention.
• Keep new and used batteries away from
children. If the battery compartment cannot
be closed securely, stop using this product
and keep it away from children.
IIf the keyless fob battery runs low, “Keyless
FOB Battery Low” appears on the gauge, which
indicates the battery should be replaced.
8 CAUTION
There is a danger of explosion if the battery is
replaced with an incorrect type.
Only replace the battery with the same or
equivalent type.
8 CAUTION
Do not expose Hand Unit to excessive heat
such as from sunlight or fire.
NOTICE
To prevent damage to the keyless fob, be care-
ful when replacing the battery.
• Install the lithium disc-type battery with the
electrodes facing the proper direction.
• Do NOT touch the internal circuit of the key-
less fob when replacing the battery.

17
To replace the keyless fob battery:
1. Insert a flat blade screwdriver in the slot of
the keyless fob and remove the cover.
2. Remove the O-ring 1.
NOTE:
The O-ring may be fitted on the cover side.
NOTICE
If the O-ring is damaged, the waterproof per-
formance deteriorates, which can cause the
keyless fob to malfunction.
Be careful not to damage the O-ring when
removing it.
3. Insert a flat blade screwdriver into the slot at
the mark on the cover to remove the bat-
tery.
4. Replace the battery so its +terminal faces
the cover side as shown in the illustration.
Lithium disc type battery: CR2025 or equiva-
lent.
Confirm that the O-ring is placed in position
on the body side.
5. Reinstall the cover.

18
PROPELLER SELECTION,
INSTALLATION AND
REMOVAL
PROPELLER SELECTION
It is essential to use a propeller on your out-
board motor that is properly matched to your
boat’s operating characteristics. The speed of
the engine when you operate your boat at full
throttle depends on the propeller you use.
Excessive engine speed can seriously damage
the motor, while low engine speed at full throttle
will adversely affect the performance. Your
operating load will also affect propeller selec-
tion. Smaller loads generally require larger-
pitch propellers; larger loads generally require
smaller-pitch propellers. Your authorized Suzuki
Marine Dealer will assist you in selecting a suit-
able propeller for your boat.
You can determine if your propeller is appropri-
ate for use with your boat by using a tachome-
ter to measure engine speed when operating
your boat at full throttle, under minimum load
conditions. If you are using an appropriate pro-
peller, the engine speed will be within the fol-
lowing range:
If the engine speed is not within this range, con-
sult your authorized Suzuki Marine Dealer to
determine which propeller size is best for you.
NOTICE
Installing a propeller with either too much or
too little pitch will cause incorrect maximum
engine speed, which may result in severe
damage to the motor.
Ask your authorized Suzuki marine dealer to
assist you in selecting a suitable propeller for
your boat.
Full throttle
operating range
DF300B 5300 – 6300
r/min. (min-1)
DF325A 5300 – 6300
r/min. (min-1)
DF350A 5700 – 6300
r/min. (min-1)
PROPELLER INSTALLATION AND
REMOVAL
8 WARNING
Failure to take proper precautions when
installing or removing the propeller can result
in severe personal injury.
When installing or removing the propeller:
• Always shift into “Neutral” and remove the
emergency stop switch lock plate so that
the motor cannot be started accidentally.
• Wear gloves to protect hands, and “lock”
the propeller by placing a block of wood
between the blades and the anti-cavitation
plate.
NOTICE
Using the improper combination of front and
rear propellers can cause lower unit damage.
Confirm the size of the front and rear propel-
lers when installing them. The front and rear
propellers must be the same number of
blades, diameter and pitch.

19
The propeller size is indicated as follows.
The first character shows the No. of blades,
then the following characters show the diameter
and pitches in this order. The last character “F”
or “R” shows the installation position.
F: Front R: Rear
Example: 3X15-1/2X25.5F
Propeller installation
To install the propeller on your outboard motor,
use the following procedure:
1. Coat the propeller shaft splines 1liberally
with Suzuki water resistant grease to help
prevent corrosion.
2. Place the front propeller stopper 2on the
shaft.
3. Align the front propeller 3with the propeller
shaft splines and slide the front propeller
onto the shaft.
4. Place the front propeller nut spacer 4and
front propeller nut stopper 5on the shaft.
NOTE:
Align section Aof the stopper 5with the
punch mark Cof the spacer 4and attach it.
5. Install the front propeller nut 6and tighten it
with a torque wrench to 125 – 135 N·m (13 –
14 kgf-m/92 – 100 lbf-ft).
NOTE:
• Front propeller nut is left hand thread.
• For removing or installing the front propeller
nut, the “Propeller nut remover & installer”
(Suzuki genuine part), is required. Consult
your authorized Suzuki marine dealer for
Suzuki genuine parts.
• Align the locking edge of the stopper 5with
the groove on the front propeller nut.
3X15-1/2X25 5F
3X15-1/2X25 5R3X15-1/2X25 5R
6. Bend the locking edge of the front propeller
nut stopper 5to the front propeller nut side
to secure the nut.
NOTE:
• Do not bend section Aand Bof the front
propeller nut stopper 5to the front propeller
nut side.
• Bend two sections of the locking edge of the
front propeller nut stopper 5.

20
7. Place the rear propeller stopper 7on the
shaft.
8. Align the rear propeller 8with the propeller
shaft splines and slide the rear propeller
onto the shaft.
9. Place the rear propeller nut spacer 9and
washer 0on the shaft.
10. Install the rear propeller nut Aand tighten it
with a torque wrench to 50 – 60 N·m (5.1 –
6.1 kgf-m/37 – 44 lbf-ft).
11. Align the grooves in the rear propeller nut
with the hole in the shaft, then insert a
cotter pin Band bend the pin ends over to
lock it in place.
Propeller removal
To remove the propeller on your outboard
motor, use the following procedure.
1. Shift to “NEUTRAL” position.
2. Remove the cotter pin 1from the rear pro-
peller nut and remove the rear propeller nut
2.
3. Remove the washer 3, spacer 4, rear pro-
peller 5and rear propeller stopper 6from
the propeller shaft.
4. Straighten the locking edges on the front
propeller nut stopper 7from the front pro-
peller nut and remove the front propeller nut
8.
NOTE:
• Front propeller nut is left hand thread.
• For removing or installing the front propeller
nut, the “Propeller nut remover & installer”
(Suzuki genuine part), is required. Consult
your authorized Suzuki marine dealer for
Suzuki genuine parts.
5. Remove the front propeller nut spacer 9,
front propeller 0and front propeller stopper
Afrom the propeller shaft.