Yamaha XF375 User manual

Read this manual carefully before operating this
outboard motor.
OWNER’S MANUAL
XF375
XF425
LIT-18626-12-08
6GR-28199-30-E0
U6GR30E0.book Page 1 Thursday, April 12, 2018 9:28 AM
©2019 Yamaha Motor Corporation, U.S.A.

This product
can expose you to chemicals
including engine exhaust, which
is known to the State of California
to cause cancer, and carbon
monoxide, which is known to the
State of California to cause birth
defects or other reproductive harm.
For more information go to
www.P65Warnings.ca.gov.
WARNING:
Ce produit peut vous exposer à des produits chimiques y compris aux
gaz d’échappement, qui sont considérés par l’état de Californie comme
étant cancérigènes, et au monoxyde de carbone, qui est considéré par
l’état de Californie comme un facteur de malformations congénitales ou
d’autres troubles de la reproduction. Pour plus d’informations,
rendez-vous sur www.P65Warnings.ca.gov.
Read this manual carefully before operating this outboard motor. Keep this manual onboard in a waterproof
bag when boating. This manual should stay with the outboard motor if it is sold.
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©2019 Yamaha Motor Corporation, U.S.A.

Important manual information
EMU44141 To the owner
Thank you for selecting a Yamaha outboard motor. This
Owner’s Manual contains information needed for proper op-
eration, maintenance and care. A thorough understanding of
these simple instructions will help you obtain maximum en-
joyment from your new Yamaha. If you have any question
about the operation or maintenance of your outboard motor,
please consult a Yamaha dealer.
In this Owner’s Manual particularly important information is
distinguished in the following ways.
: This is the safety alert symbol. It is used to alert you to
potential personal injury hazards. Obey all safety messages
that follow this symbol to avoid possible injury or death.
WARNING
EWM00782
A WARNING indicates a hazardous situation which, if not
avoided, could result in death or serious injury.
NOTICE
ECM00702
A NOTICE indicates special precautions that must be
taken to avoid damage to the outboard motor or other
property.
TIP:
A TIP provides key information to make procedures easier or
clearer.
Yamaha continually seeks advancements in product design
and quality. Therefore, while this manual contains the most
current product information available at the time of printing,
there may be minor discrepancies between your machine
and this manual. If there is any question concerning this
manual, please consult your Yamaha dealer.
To ensure long product life, Yamaha recommends that you
use the product and perform the specified periodic inspec-
tions and maintenance by correctly following the instruc-
tions in the owner’s manual. Any damage resulting from
neglect of these instructions is not covered by warranty.
Some countries have laws or regulations restricting users
from taking the product out of the country where it was pur-
chased, and it may be impossible to register the product in
the destination country. Additionally, the warranty may not
apply in certain regions. When planning to take the product
to another country, consult the dealer where the product
was purchased for further information.
If you purchased this outboard motor used, see your
Yamaha dealer to have it registered in your name in Yamaha
records.
TIP:
The XF375NSA, XF425NSA and the standard accessories
are used as a base for the explanations and illustrations in
this manual. Therefore some items may not apply to every
model.
EMU44151
XF375, XF425
OWNER’S MANUAL
©2018 by Yamaha Motor Co., Ltd.
1st Edition, March 2018
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Co., Ltd.
is expressly prohibited.
Printed in Japan
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Table of contents
Safety information ..................................................1
Outboard motor safety ......................................... 1
Propeller .................................................................... 1
Rotating parts............................................................ 1
Hot parts.................................................................... 1
Electric shock............................................................ 1
Power trim and tilt ..................................................... 1
Engine shut-off cord (lanyard)................................... 1
Gasoline .................................................................... 1
Gasoline exposure and spills .................................... 1
Carbon monoxide...................................................... 1
Modifications............................................................. 1
Boating safety ...................................................... 1
Alcohol and drugs ..................................................... 1
Personal flotation devices (PFDs).............................. 1
People in the water.................................................... 1
Passengers................................................................ 2
Overloading ............................................................... 2
Avoid collisions.......................................................... 2
Weather ..................................................................... 2
Accident reporting..................................................... 2
Boat education and training ...................................... 2
Passenger training..................................................... 2
Boating safety publications....................................... 2
Laws and regulations ................................................ 2
Boating organizations........................................... 3
Basic boating rules (Rules of the road) ................ 3
Steering and sailing rules and sound signals............ 3
Rules when encountering vessels............................. 3
Other special situations............................................. 4
General information................................................6
Identification numbers record .............................. 6
Outboard motor serial number.................................. 6
Digital electronic control serial number..................... 6
Key number ............................................................... 6
EC Declaration of Conformity (DoC)..................... 7
CE Marking........................................................... 7
Compliance mark label......................................... 7
Read manuals and labels ..................................... 8
Warning labels .......................................................... 9
Specifications and requirements ........................10
Specifications..................................................... 10
Installation requirements .................................... 11
Boat horsepower rating........................................... 11
Mounting outboard motor ....................................... 11
Digital electronic control requirements .............. 11
Battery requirements.......................................... 11
Battery specifications.............................................. 11
Propeller selection.............................................. 12
Counter rotation models ......................................... 12
Start-in-gear protection...................................... 12
Engine oil requirements...................................... 12
Fuel requirements............................................... 13
Gasoline .................................................................. 13
Gasoline Additives................................................... 13
Anti-fouling paint................................................ 14
Outboard motor disposal requirements............. 14
Emergency equipment....................................... 14
Emission control information ............................ 14
Star labels................................................................ 14
Components .........................................................16
Components diagram ........................................ 16
Optional items ......................................................... 18
Helm Master®.......................................................... 21
Yamaha Security System (Y-COP).......................... 21
Digital Electronic Control box.................................. 21
Digital electronic control-active indicator................ 21
Digital electronic control-alert indicator .................. 22
Control lever ............................................................ 22
Free throttle switch.................................................. 22
Throttle friction adjuster .......................................... 22
Engine selector switch ............................................ 23
Engine shut-off cord (lanyard) and clip ................... 23
Main switch ............................................................. 23
Start/Stop switch panel........................................... 23
All Start/Stop switch panel...................................... 24
Power trim and tilt switch on digital electronic
control.................................................................. 24
Power trim and tilt switch on bottom cowling......... 24
Power trim and tilt switches .................................... 24
Tilt limiter ................................................................. 25
Tilt support lever for power trim and tilt model ....... 25
Cowling lock lever ................................................... 25
Flushing device ....................................................... 25
Fuel filter.................................................................. 26
Instruments and indicators .................................27
CL7 Display........................................................ 27
Engine control system .........................................29
Alert system ....................................................... 29
Helm Master control system alert ........................... 29
Digital Electronic Control alert................................. 29
Overheat alert.......................................................... 29
Low oil pressure alert .............................................. 30
Water separator alert............................................... 30
Installation ............................................................31
Installation.......................................................... 31
Mounting the outboard motor ................................. 31
Operation ..............................................................32
First-time operation............................................ 32
Filling engine oil....................................................... 32
Breaking in engine................................................... 32
Getting to know your boat....................................... 32
Checks before starting engine........................... 32
Fuel level ................................................................. 32
Removing top cowling............................................. 32
Fuel system ............................................................. 33
Controls................................................................... 33
Engine shut-off cord (lanyard) ................................. 33
Engine oil................................................................. 34
Outboard motor....................................................... 34
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Table of contents
Flushing device ....................................................... 34
Installing top cowling............................................... 34
Checking power trim and tilt system....................... 35
Battery..................................................................... 36
Filling fuel .......................................................... 36
Operating engine................................................ 36
Sending fuel ............................................................ 36
Starting engine ........................................................ 36
Checks after starting engine .............................. 38
Cooling water .......................................................... 38
Warming up engine ............................................ 38
Procedure for warming up engine........................... 38
Checks after engine warm up ............................ 38
Shifting .................................................................... 38
Stop switches.......................................................... 38
Operating the port, center, and starboard
outboard motors.............................................. 38
Selecting the outboard motor using the engine
selector switch (triple engines) ........................ 39
Shifting ............................................................... 42
Stopping boat..................................................... 42
Boat direction ..................................................... 43
Trolling................................................................ 45
Adjusting trolling speed........................................... 45
Stopping engine ................................................. 45
Procedure for stopping engine................................ 45
Trimming outboard motor .................................. 45
Adjusting trim angle (Power trim and tilt) ................ 45
Adjusting boat trim .................................................. 46
Tilting up and down............................................ 46
Procedure for tilting up (power trim and tilt
models) ................................................................ 47
Procedure for tilting down....................................... 47
Shallow water .................................................... 48
Cruising in shallow water ........................................ 48
Operating in other conditions............................. 49
Maintenance .........................................................50
Transporting and storing outboard motor.......... 50
Storing outboard motor........................................... 50
Conditioning and stabilizing gasoline...................... 50
Lubrication............................................................... 50
Cleaning and anticorrosion measures..................... 50
Flushing cooling water passage.............................. 50
Cleaning the outboard motor .................................. 51
Checking painted surface of outboard motor ......... 51
Periodic maintenance......................................... 51
Replacement parts .................................................. 52
Maintenance interval guidelines.............................. 52
Maintenance chart 1................................................ 53
Maintenance chart 2................................................ 54
Greasing .................................................................. 55
Inspecting spark plug.............................................. 57
Inspecting engine idle speed .................................. 57
Changing engine oil................................................. 57
Inspecting wiring and connectors ........................... 57
Inspecting propeller................................................. 57
Removing propeller ................................................. 57
Installing propeller ................................................... 58
Changing gear oil .................................................... 58
Inspecting and replacing anode(s) .......................... 60
Checking battery (for electric start models) ............ 60
Connecting the battery............................................ 60
Disconnecting the battery ....................................... 61
Storing the battery................................................... 61
Trouble Recovery .................................................62
Troubleshooting ................................................. 62
Temporary action in emergency ........................ 64
Impact damage ....................................................... 64
Running in an emergency (multiple engines)........... 64
Replacing fuse......................................................... 64
Power trim and tilt unit will not operate................... 65
Steer-by-wire system will not operate .................... 65
Water separator-alert is activated after leaving
port....................................................................... 66
Treatment of submerged motor......................... 67
Consumer information (For North America) ......68
YAMAHA FOUR-STROKE OUTBOARD MOTOR
THREE-YEAR LIMITED WARRANTY .............. 68
IMPORTANT WARRANTY INFORMATION IF
YOU USE YOUR YAMAHA OUTSIDE THE
U.S.A. OR CANADA ........................................ 70
INDEX ....................................................................71
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1
Safety information
EMU33623 Outboard motor safety
Observe these precautions at all times.
EMU36502
Propeller
People can be injured or killed if they come in contact with
the propeller. The propeller can keep moving even when the
motor is in neutral, and sharp edges of the propeller can cut
even when stationary.
Stop the engine when a person is in the water near you.
Keep people out of reach of the propeller, even when the
engine is off.
EMU40272
Rotating parts
Hands, feet, hair, jewelry, clothing, personal flotation device
(PFD) straps, etc., can become entangled with internal rotat-
ing parts of the engine, resulting in serious injury or death.
Keep the top cowling in place whenever possible. Do not re-
move or replace the top cowling with the engine running.
Only operate the engine with the top cowling removed ac-
cording to the specific instructions in the manual. Keep
hands, feet, hair, jewelry, clothing, PFD straps, etc., away
from any exposed moving parts.
EMU33641
Hot parts
During and after operation, engine parts are hot enough to
cause burns. Avoid touching any parts under the top cowling
until the engine has cooled.
EMU33651
Electric shock
Do not touch any electrical parts while starting or operating
the engine. They can cause shock or electrocution.
EMU33661
Power trim and tilt
Body parts can be crushed between the motor and the
clamp bracket when the motor is trimmed or tilted. Keep
body parts out of this area at all times. Be sure no one is in
this area before operating the power trim and tilt mecha-
nism.
The power trim and tilt switches operate even when the main
switch is off. Keep people be away from the switches when-
ever working around the motor.
Never get under the lower unit while it is tilted, even when the
tilt support lever is locked. Severe injury could occur if the
outboard motor accidentally falls.
EMU33672
Engine shut-off cord (lanyard)
Attach the engine shut-off cord so that the engine stops if
the operator falls overboard or leaves the helm. This pre-
vents the boat from running away under power and leaving
people stranded, or running over people or objects.
Always attach the engine shut-off cord to a secure place on
your clothing or your arm or leg while operating. Do not re-
move it to leave the helm while the boat is moving. Do not
attach the cord to clothing that could tear loose, or route the
cord where it could become entangled, preventing it from
functioning.
Do not route the cord where it is likely to be accidentally
pulled out. If the cord is pulled during operation, the engine
will shut off and you will lose most steering control. The boat
could slow rapidly, throwing people and objects forward.
EMU33811
Gasoline
Gasoline and its vapors are highly flammable and explo-
sive. Always, refuel according to the procedure on page 36
to reduce the risk of fire and explosion.
EMU33821
Gasoline exposure and spills
Take care not to spill gasoline. If gasoline spills, wipe it up
immediately with dry rags. Dispose of rags properly.
If any gasoline spills onto your skin, immediately wash with
soap and water. Change clothing if gasoline spills on it.
If you swallow gasoline, inhale a lot of gasoline vapor, or get
gasoline in your eyes, get immediate medical attention. Nev-
er siphon fuel by mouth.
EMU33901
Carbon monoxide
This product emits exhaust gases which contain carbon
monoxide, a colorless, odorless gas which may cause brain
damage or death when inhaled. Symptoms include nausea,
dizziness, and drowsiness. Keep cockpit and cabin areas
well ventilated. Avoid blocking exhaust outlets.
EMU33781
Modifications
Do not attempt to modify this outboard motor. Modifications
to your outboard motor may reduce safety and reliability,
and render the outboard unsafe or illegal to use.
EMU33741 Boating safety
This section includes a few of the many important safety pre-
cautions that you should follow when boating.
EMU33711
Alcohol and drugs
Never operate after drinking alcohol or taking drugs. Intoxi-
cation is one of the most common factors contributing to
boating fatalities.
EMU40281
Personal flotation devices (PFDs)
Have an approved PFD on board for every occupant.
Yamaha recommends that you must wear a PFD whenever
boating. At a minimum, children and non-swimmers should
always wear PFDs, and everyone should wear PFDs when
there are potentially hazardous boating conditions.
EMU33732
People in the water
Always watch carefully for people in the water, such as
swimmers, skiers, or divers, whenever the engine is running.
When someone is in the water near the boat, shift into neu-
tral and stop the engine.
Stay away from swimming areas. Swimmers can be hard to
see.
The propeller can keep moving even when the motor is in
neutral. Stop the engine when a person is in the water near
you.
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Safety information
2
EMU33752
Passengers
Consult your boat manufacturer’s instructions for details
about appropriate passenger locations in your boat and be
sure all passengers are positioned properly before acceler-
ating and when operating above an idle speed. Standing or
sitting in non-designated locations may result in being
thrown either overboard or within the boat due to waves,
wakes, or sudden changes in speed or direction. Even when
people are positioned properly, alert your passengers if you
must make any unusual maneuver. Always avoid jumping
waves or wakes.
EMU33763
Overloading
Do not overload the boat. Consult the boat capacity plate or
boat manufacturer for maximum weight and number of pas-
sengers. Be sure that weight is properly distributed accord-
ing to the boat manufacturer’s instructions. Overloading or
incorrect weight distribution can compromise the boat’s
handling and lead to an accident, capsizing or swamping.
EMU33773
Avoid collisions
Scan constantly for people, objects, and other boats. Be
alert for conditions that limit your visibility or block your vi-
sion of others.
Operate defensively at safe speeds and keep a safe distance
away from people, objects, and other boats.
Do not follow directly behind other boats or waterskiers.
Avoid sharp turns or other maneuvers that make it hard for
others to avoid you or understand where you are going.
Avoid areas with submerged objects or shallow water.
Ride within your limits and avoid aggressive maneuvers to
reduce the risk of loss of control, ejection, and collision.
Take early action to avoid collisions. Remember, boats do
not have brakes, and stopping the engine or reducing
throttle can reduce the ability to steer. If you are not sure
that you can stop in time before hitting an obstacle, apply
throttle and turn in another direction.
EMU33791
Weather
Stay informed about the weather. Check weather forecasts
before boating. Avoid boating in hazardous weather.
EMU44161
Accident reporting
Boat operators are required by law to file a Boating Accident
Report with their boating law enforcement agency if their
boat is involved in any of the following accidents:
1. There is loss of life or probable loss of life.
2. There is personal injury that requires medical attention
beyond first aid.
3. There is property damage to boats or other property
over a certain amount.
4. There is complete loss of a boat.
Contact local law enforcement personnel if a report is nec-
essary.
EMU44172
Boat education and training
For U.S.A.
Operators should take a boating safety course. This may be
required in your state. Many of the organizations listed in the
next section can provide information about courses in your
area.
You may also want to consider an Internet-based program
for basic boater education. The Online Boating Safety
Course provided by the BoatU.S. Foundation, is approved
by the National Association of State Boating Law Adminis-
trators (NASBLA) and recognized by the United States Coast
Guard. Most, but not all, states accept this course to meet
their minimum requirements. While it cannot replace an in-
depth course such as one offered by the U.S. Coast Guard,
U.S. Power Squadron, or other organization, this online
course does provide a general overview of the basics in
boating safety, requirements, navigation, and operation.
Upon successful completion of the course, the user can
download a certificate of completion immediately or, for a
small charge, request one by mail. To take this free course,
go to boatus.org.
For Canada
All operators of pleasure craft must illustrate competency by
means of a Pleasure Craft Operators Card with the excep-
tion of Personal Water Craft used for rental purposes which
require a rental checklist be completed. Pleasure Craft Op-
erators Cards can be obtained following the completion of a
competency course, with an online option. Details can be
found on Transport Canada’s website. www.tc.gc.ca
EMU33881
Passenger training
Make sure at least one other passenger is trained to operate
the boat in the event of an emergency.
EMU33891
Boating safety publications
Be informed about boating safety. Additional publications
and information can be obtained from many boating organi-
zations.
EMU33592
Laws and regulations
Know the marine laws and regulations where you will be
boating—and obey them. Several sets of rules prevail ac-
cording to geographic location, but all are basically the same
as the International Rules of the Road. The rules presented
in the following section are condensed—and have been pro-
vided for your convenience only.
Contact the U.S. Coast Guard, the National Association of
State Boating Law Administrators, or your local Power
Squadron for a complete set of rules governing the waters in
which you will be using your boat.
ZMU06025
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Safety information
3
EMU44741 Boating organizations
The following organizations provide boating safety training
and information about boating safety and laws.
In the U.S.A.
United States Coast Guard
Consumer Affairs Staff (G-BC)
Office of Boating, Public, and Consumer Affairs
U.S. Coast Guard Headquarters
Washington, D.C. 20593-0001
http://www.uscgboating.org/
United States Power Squadrons
1-888-FOR-USPS (1-888-367-8777)
http://www.usps.org/
Boat Owners Association of The United States
1-800-336-BOAT (1-800-336-2628)
http://www.boatus.com/
National Association of State Boating Law Administra-
tors (NASBLA)
1500 Leestown Road, Suite 330
Lexington, KY 40511 859-225-9497
http://www.nasbla.org/
National Marine Manufacturers Association (NMMA)
200 East Randolph Drive
Suite 5100
Chicago, IL 60601
http://www.nmma.org/
Marine Retailers Association of America
155 N. Michigan Ave.
Chicago, IL 60304
http://www.mraa.com/
In Canada
National Marine Manufacturers Association Canada
14 McEwan Drive
Suite 8
Bolton, ON
L7E 1H1
http://www.nmma.org/
In Australia
Boating Industry Association of Australia
http://www.biaa.com.au/
In New Zealand
NZ Marine Industry Association
http://www.nzmarine.com/
EMU33692
Basic boating rules (Rules of the road)
Just as there are rules that apply when you are driving on
streets and highways, there are waterway rules that apply
when you are driving your boat. These rules are used inter-
nationally. (For U.S.A.: and are also enforced by the United
States Coast Guard and local agencies.) You should be
aware of these rules, and follow them whenever you encoun-
ter another vessel on the water.
EMU33702
Steering and sailing rules and sound signals
Whenever two vessels on the water meet one another, one
vessel has the right-of-way; it is called the “stand-on” ves-
sel. The vessel that does not have the right-of-way is called
the “give-way” or “burdened” vessel. These rules determine
which vessel has the right-of-way, and what each vessel
should do.
Stand-on vessel
The vessel with the right-of-way has the duty to continue its
course and speed, except to avoid an immediate collision.
When you maintain your direction and speed, the other ves-
sel will be able to determine how best to avoid you.
Give-way vessel
The vessel that does not have the right-of-way has the duty
to take positive and timely action to stay out of the way of the
Stand-On vessel. Normally, you should not cross in front of
the vessel with the right-of-way. You should slow down or
change directions briefly and pass behind the other vessel.
You should always move in such a way that the operator of
the other vessel can see what you are doing.
“The general prudential rule”
This rule is called Rule 2 in the International Rules and says,
“In obeying and construing these rules due regard shall be
had to all dangers of navigation and collision, and to any
special circumstances, which may render a departure from
the above rules necessary in order to avoid immediate dan-
ger.”
In other words, follow the standard rules except when a col-
lision will occur unless both vessels try to avoid each other.
If that is the case, both vessels become “Give-Way” vessels.
EMU25524
Rules when encountering vessels
There are three main situations that you may encounter with
other vessels which could lead to a collision unless the
Steering Rules are followed:
Meeting: (you are approaching another vessel head-on)
Crossing: (you are traveling across the other vessel’s path)
Overtaking: (you are passing or being passed by another
vessel)
In the following illustration, your boat is in the center. You
should give the right-of-way to any vessels shown in white
area (you are the Give-Way vessel). Any vessels in the shad-
ed area must yield to you (they are the Give-Way vessels).
Both you and the meeting vessel must alter course to avoid
each other.
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Safety information
4
Meeting
If you are meeting another power vessel head-on, and are
close enough to run the risk of collision, neither of you has
the right-of-way. Both of you should alter course to avoid an
accident. You should keep the other vessel on your port (left)
side. This rule doesn’t apply if both of you will clear one an-
other if you continue on your set course and speed.
Crossing
When two power driven vessels are crossing each other’s
path close enough to run the risk of collision, the vessel
which has the other on the starboard (right) side must keep
out of the way of the other. If the other vessel is on your right,
you must keep out of its way; you are the Give-Way vessel.
If the other vessel is on your port (left) side, remember that
you should maintain course and direction, provided the oth-
er vessel gives you the right-of-way as it should.
Overtaking
If you are passing another vessel, you are the “Give-Way”
vessel. This means that the other vessel is expected to main-
tain its course and speed. You must stay out of its way until
you are clear of it. Likewise, if another vessel is passing you,
you should maintain your speed and direction so that the
other vessel can steer itself around you.
EMU47290
Other special situations
There are three other rules you should be aware of when
driving your boat around other vessels.
Narrow channels and bends
When navigating in narrow channels, you should keep to the
right when it is safe and practical to do so. If the operator of
a power-driven vessel is preparing to go around a bend that
may obstruct the view of other water vessels, the operator
should sound a prolonged blast on the whistle (4 to 6 sec-
onds). If another vessel is around the bend, it too should
sound the whistle. Even if no reply is heard, however, the
vessel should still proceed around the bend with caution. If
you navigate such waters with your boat, you will need to
carry a portable air horn, available from local marine supply
stores.
Fishing vessel right-of-way
All vessels that are fishing with nets, lines or trawls are con-
sidered to be “fishing vessels” under the International Rules.
Vessels with trolling lines are not considered fishing vessels.
Fishing vessels have the right-of-way regardless of position.
Fishing vessels cannot, however, impede the passage of
other vessels in narrow channels.
Sailing vessel right-of-way
Sailing vessels should normally be given the right-of-way.
The exceptions to this are:
1. When the sailing vessel is overtaking the power-driven
vessel, the power-driven vessel has the right-of-way.
2. Sailing vessels should keep clear of any fishing vessel.
3. In a narrow channel, a sailing vessel should not hamper
the safe passage of a power-driven vessel that can nav-
igate only in such a channel.
Reading buoys and other markers
The waters of the United States are marked for safe naviga-
tion by the lateral system of buoyage. Simply put, buoys and
markers have an arrangement of shapes, colors, numbers
and lights to show which side of the buoy a boater should
pass on when navigating in a particular direction. The mark-
ings on these buoys are oriented from the perspective of be-
ing entered from seaward (the boater is going towards the
port). This means that red buoys are passed on the star-
board (right) side when proceeding from open water into
port, and black buoys are to port (left) side. When navigating
out of port, your position with respect to the buoys should be
reversed; red buoys should be to port and black buoys to
starboard.
Many bodies of water used by boaters are entirely within the
boundaries of a particular state. The Uniform State Water-
way Marking System has been devised for these waters.
This system uses buoys and signs with distinctive shapes
and colors to show regulatory or advisory information. These
markers are white with black letters and orange boarders.
They signify speed zones, restricted areas, danger areas,
and general information.
Remember, markings may vary by geographic location. Al-
ways consult local boating authorities before driving your
boat in unfamiliar waters.
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Safety information
5
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General information
6
EMU25172 Identification numbers record
EMU25186
Outboard motor serial number
The outboard motor serial number is stamped on the label
attached to the port side of the clamp bracket.
Record your outboard motor serial number in the spaces
provided to assist you in ordering spare parts from your
Yamaha dealer or for reference in case your outboard motor
is stolen.
EMU34944
Digital electronic control serial number
The digital electronic control serial number is stamped on
the label attached to the digital electronic control box.
Record your digital electronic control serial number in the
spaces provided to assist you in newly connecting the digital
electronic control to the outboard motor.
TIP:
Consult your Yamaha dealer if you have any questions con-
cerning the digital electronic control serial number.
EMU41572
Key number
The key identification number is stamped on the spare key
as shown in the illustration. Keep the spare key in a safe
place and record this number in the space provided for ref-
erence in case that you need a new key.
1. Outboard motor serial number location
1. Serial number
2. Model name
3. Motor transom height
4. Approved model code
1. Digital electronic control serial number
1
3412
ZMU01692
ZMU05885
1
1. Digital electronic control serial number
1. Serial number
2. Type
3. Approved model code
1. Key number
1. Key number
ZMU05887
1
231
ZMU05917
1
ZMU01694
1
ZMU07133
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General information
7
EMU38982
EC Declaration of Conformity (DoC)
This declaration is included with outboard motors that con-
form to European regulations.
This outboard motor conforms to certain portions of the Eu-
ropean Parliament directive relating to machinery.
Each conformed outboard motor accompanied with EC
DoC.EC DoC contains the following information;
Name of engine manufacturer
Model name
Product code of model (Approved model code)
Code of conformed directives
EMU38995 CE Marking
This label is affixed to outboard motors that conform to Eu-
ropean regulations.
Outboard motors affixed with this “CE” marking conform
with the directives of; 2006/42/EC, 94/25/EC - 2003/44/EC,
2014/30/EU, and 2004/108/EC, 2013/53/EU.
EMU46133 Compliance mark label
Engines affixed with this label conform to the regulations for
each country.
This label is affixed to the clamp bracket or swivel bracket.
Regulatory Compliance Mark (RCM)
Engines affixed with this mark conform to certain portion(s)
of the Australian Radio Communications Act.
ICES-002 Compliance Label
Engines affixed with this mark meet all requirements of the
Canadian Interference Causing Equipment Regulations.
1. CE marking location
1. Compliance mark label location
1
ZMU08148
2500 SHINGAI, IWATA,
SHIZUOKA, JAPAN
YAMAHA MOTOR CO., LTD.
YAMAHA
1
1. Regulatory Compliance Mark (RCM)
1. ICES-002 Compliance Label
ZMU08190
1
ZMU08191
1
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General information
8
EMU47301 Read manuals and labels
Before operating or working on this outboard motor:
Read this manual.
Read any manuals supplied with the boat.
Read all labels on the outboard motor and the boat.
If you need any additional information, contact your Yamaha dealer.
Symbols
The following symbols indicate:
Notice/Warning Read Owner’s Manual
Hazard caused by continuous
rotation Electrical hazard
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General information
9
EMU47310
Warning labels
If these labels are damaged or missing, contact your Yamaha dealer for replacements.
6EE-G2794-40
6EE-H1994-40
6EE-G2794-50
6EE-H1994-50
1
2
3
WARNING
Vapor separator tank (VST) contains pressurized fuel.
To reduce the risk of spraying fuel during VST service:
1. Wrap fuel hose connector in a cloth then disconnect hose slowly to release pressure.
2. Remove band from fuel nipple.
3. Open drain cap to drain the fuel from VST.
AVERTISSEMENT
Le réservoir du séparateur de vapeur (VST) contient du carburant sous pression.
Pour réduire le risque de pulvérisation du carburant pendant l’entretien du VST:
1. Envelopper le connecteur de durite d’alimentation dans un chiffon, puis détacher
lentement la durite pour libérer la pression.
2. Enlever la sangle du raccord de carburant.
3. Ouvrir le capuchon de vidange pour vidanger le carburant du VST. 6GR-2415H-00
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Specifications and requirements
10
EMU40501 Specifications
TIP:
“(SUS)” indicates that the specification is for the outboard
motor when it is equipped with a stainless steel propeller.
EMU2821Y
Dimension and weight:
Overall length:
1217 mm (47.9 in)
Overall width:
652 mm (25.7 in)
Overall height X:
2059 mm (81.1 in)
Overall height U:
2186 mm (86.1 in)
Overall height E:
2313 mm (91.1 in)
Motor transom height X:
640 mm (25.2 in)
Motor transom height U:
767 mm (30.2 in)
Motor transom height E:
894 mm (35.2 in)
Dry weight (SUS) X:
442 kg (974 lb)
Dry weight (SUS) U:
453 kg (999 lb)
Dry weight (SUS) E:
463 kg (1021 lb)
Performance:
Full throttle operating range:
5000–6000 r/min
Rated power:
279.6 kW (375 HP) (F375SA, LF375SA)
316.9 kW (425 HP) (F425SA, LF425SA)
Idle speed (in neutral):
650–750 r/min
Power unit:
Type:
4-stroke DOHC V8 32 valves
Total displacement:
5559 cm³ (339.2 c.i.)
Bore ×stroke:
96.0 ×96.0 mm (3.78 ×3.78 in)
Ignition system:
TCI
Spark plug (NGK):
ILMAR7E-9
Spark plug gap:
0.8–0.9 mm (0.031–0.035 in)
Steering system:
Remote steering
Starting system:
Electric starter
Starting carburetion system:
Fuel injection
Valve clearance IN (cold engine):
0.17–0.24 mm (0.0067–0.0094 in)
Valve clearance EX (cold engine):
0.37–0.44 mm (0.0146–0.0173 in)
Battery rating (CCA/SAE):
700 A
Battery rating (MCA/ABYC):
900 A
Battery rating (RC/SAE):
170 minutes
Battery rating (CCA/EN):
670 A
Battery rating (20HR/IEC):
110 Ah
Maximum generator output:
90 A
Lower unit:
Gear shift positions:
Forward-neutral-reverse
Gear ratio:
1.79 (25/14)
Trim and tilt system:
Power trim and tilt
Propeller mark:
Y (F375SA, F425SA)
YL (LF375SA, LF425SA)
Fuel and oil:
Recommended fuel:
Premium unleaded gasoline
Min. pump octane number (PON):
89
Min. research octane number (RON):
94
Recommended engine oil:
YAMALUBE 4M FC-W or 4-stroke outboard motor oil
Recommended engine oil grade 1:
SAE 10W-30/10W-40/5W-30
API SG/SH/SJ/SL
Engine oil quantity (without oil filter replacement):
7.5 L (7.93 US qt, 6.60 Imp.qt)
Engine oil quantity (with oil filter replacement):
7.8 L (8.24 US qt, 6.86 Imp.qt)
Lubrication system:
Wet sump
Recommended gear oil:
Yamalube Marine Gearcase Lube HD or Hypoid gear oil
Recommended gear oil grade:
SAE 80W API GL-5 / SAE 90 API GL-5
Gear oil quantity:
1.830 L (1.934 US qt, 1.610 Imp.qt) (LF375SA,
LF425SA)
1.950 L (2.061 US qt, 1.716 Imp.qt) (F375SA, F425SA)
Noise and vibration level:
Operator sound pressure level (ICOMIA 39/94):
90.9 dB(A)
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Specifications and requirements
11
EMU33556 Installation requirements
EMU33566
Boat horsepower rating
WARNING
EWM01561
Overpowering a boat can cause severe instability.
Before installing the outboard motor(s), confirm that the total
horsepower of your outboard motor(s) does not exceed the
boat’s maximum horsepower rating. See the boat’s capacity
plate or contact the manufacturer.
EMU40491
Mounting outboard motor
WARNING
EWM02501
Improper mounting of the outboard motor could result
in hazardous conditions such as poor handling, loss of
control, or fire hazards.
Because the outboard motor is very heavy, special
equipment and training is required to mount it safely.
Your dealer or other person experienced in proper rigging
should mount the outboard motor using correct equipment
and complete rigging instructions. For further information,
see page 31.
EMU34954
Digital electronic control requirements
The digital electronic control is equipped with a start-in-gear
protection device(s). This device prevents the engine from
starting unless it is in neutral.
WARNING
EWM01581
If the engine starts in gear, the boat can move sudden-
ly and unexpectedly, possibly causing a collision or
throwing passengers overboard.
If the engine ever starts in gear, the start-in-gear pro-
tection device is not working correctly and you should
discontinue using the outboard. Contact your Yamaha
dealer.
This digital electronic control unit is only available for the
outboard motor which you have purchased.
Prior to use of the digital electronic control unit, set it in order
to operate your outboard motor only. Otherwise, it will not be
possible to operate the outboard motor.
Perform setting of the outboard motor and the digital elec-
tronic control unit in the following cases.
If a used outboard motor is installed
If the digital electronic control unit is replaced
If the ECM (Electronic control module) of the used out-
board motor is replaced
If the ECM (Electronic control module) of the digital elec-
tronic control unit is replaced
Consult your Yamaha dealer for setting.
EMU25695 Battery requirements
EMU44724
Battery specifications
Standard lead-acid, AGM, gel-cell, and maintenance-free
batteries are permitted. Use a fully charged battery that
meets the following specifications. The battery is an impor-
tant component necessary to obtain sure engine starting
and to maintain engine performance.
The engine may not start if the battery voltage is too low.
For North America
It is necessary to meet only two of the three specifications
(CCA, MCA, and RC) in one of the following combinations:
CCA/SAE and RC
MCA/ABYC and RC
For Oceania
It is necessary to meet the following specifications.
NOTICE
ECM01064
Do not use a battery that does not meet the specified
capacity. If a battery that does not meet specifications
is used, the electric system could perform poorly or be
overloaded, causing electric system damage.
Do not use a battery which exceeds the maximum
CCA rating. If the batteries are used in parallel circuit,
use new batteries of the same type and make sure that
the total battery rating never exceeds the maximum
CCA rating.
EMU36293
Mounting battery
Mount the battery holder securely in a dry, well-ventilated,
vibration-free location in the boat. WARNING! Do not put
flammable items, or loose heavy or metal objects in the
same compartment as the battery. Fire, explosion or
sparks could result. [EWM01821]
Battery cable
The battery cable size and length are critical. Consult your
Yamaha dealer about the battery cable size and length.
EMU36303
Multiple batteries
To connect multiple batteries, such as for multiple engine
configurations or for an accessory battery, consult your
Yamaha dealer about battery selection and correct wiring.
Battery rating (CCA/SAE):
700 A
Battery rating (MCA/ABYC):
900 A
Battery rating (RC/SAE):
170 minutes
Battery rating (CCA/EN):
670 A
Battery rating (20HR/IEC):
110 Ah
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Specifications and requirements
12
Battery isolator
Your outboard motor is capable of charging an accessory
battery separate from the starting battery using an optional
isolator lead. Contact your Yamaha dealer for installation of
an optional isolator lead with over-current protection.
EMU41604 Propeller selection
Next to selecting an outboard motor, selecting the right pro-
peller is one of the most important purchasing decisions a
boater can make. The type, size, and design of your propel-
ler have a direct impact on acceleration, top speed, fuel
economy, and even engine life. Yamaha designs and manu-
factures propellers for every Yamaha outboard motor and
every application.
Your Yamaha dealer can help you select the right propeller
for your boating needs. Select a propeller that will allow the
engine to reach the middle or upper half of the operating
range at full throttle with the maximum boatload. Generally,
select a larger pitch propeller for a smaller operating load
and a smaller pitch propeller for a heavier load. If you carry
loads that vary widely, select the propeller that lets the en-
gine run in the proper range for your maximum load but re-
member that you may need to reduce your throttle setting to
stay within the recommended engine speed range when car-
rying lighter loads.
Yamaha recommends to use a propeller suitable for the
“Shift Dampener System (SDS)”. For further information,
consult your Yamaha dealer.
To check the propeller, see page 57.
Propeller example
EMU36313
Counter rotation models
Standard outboard motors rotate clockwise. Counter rota-
tion models rotate counterclockwise and are typically used
in multiple motor setups.
On counter rotation models, be sure to use a propeller in-
tended for counterclockwise rotation. These propellers are
identified with the letter “L” after the size indication on the
propeller. WARNING! Never use a standard propeller with
a counter rotation motor, or a counter rotation propeller
with a standard motor. Otherwise the boat could go in
the direction opposite of that expected (for example, re-
verse instead of forward), which could lead to an acci-
dent. [EWM01811]
For instructions on propeller removal and installation, see
page 57.
EMU35141 Start-in-gear protection
Yamaha outboard motors or Yamaha-approved digital elec-
tronic control units are equipped with start-in-gear protec-
tion device(s). This feature permits the engine to be started
only when it is in neutral. Always select neutral before start-
ing the engine.
EMU41953 Engine oil requirements
Select an oil grade according to the average temperatures in
the area where the outboard motor will be used.
If oil grades listed under Recommended engine oil grade 1
are not available, select an alternative oil grade listed under
Recommended engine oil grade 2.
Recommended engine oil grade 1
Recommended engine oil grade 2
1. Propeller diameter in inches
2. Propeller pitch in inches
3. Type of propeller (propeller mark)
ZMU07044
31
2
Recommended engine oil:
YAMALUBE 4M FC-W or 4-stroke
outboard motor oil
Recommended engine oil grade 1:
SAE 10W-30/10W-40/5W-30
API SG/SH/SJ/SL
Recommended engine oil grade 2:
SAE 15W-40/20W-40/20W-50
API SH/SJ/SL
Engine oil quantity (without oil filter
replacement):
7.5 L (7.93 US qt, 6.60 Imp.qt)
Engine oil quantity (with oil filter re-
placement):
7.8 L (8.24 US qt, 6.86 Imp.qt)
ZMU08143
122˚F
50˚C
104
40
86
30
68
SAE API
SG
SH
SJ
SL
20
50
10
32
0
14
-10
-4
-20
10W–30
10W–40
5W–30
ZMU06855
122˚F
50˚C
104
40
86
30
68
SAE API
SH
SJ
SL
20
50
10
32
0
14
-10
-4
-20
15W–40
20W–40
20W–50
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Specifications and requirements
13
EMU36361 Fuel requirements
EMU44791
Gasoline
Use a good quality gasoline that meets the minimum octane
requirement. If knocking or pinging occurs, use a different
brand of gasoline or premium unleaded fuel. Yamaha rec-
ommends that you use alcohol-free gasoline (see Gasoline
with Ethanol) whenever possible.
The use of a poor quality gasoline may result in starting and
running problems. If you encounter drivability problems,
which you suspect could be related to the fuel you are using,
Yamaha recommends that you switch to a recognized high
quality brand of gasoline, such as a gasoline that is adver-
tised as Top Tier Detergent Gasoline. (North America only)
NOTICE: Failure to comply with these recommendations
may also result in unscheduled maintenance, fuel sys-
tem damage, and internal engine damage. [ECM04480]
For North America
For Oceania
NOTICE
ECM01982
Do not use leaded gasoline. Leaded gasoline can seri-
ously damage the engine.
Avoid getting water and contaminants in the fuel tank.
Contaminated fuel can cause poor performance or en-
gine damage. Use only fresh gasoline that has been
stored in clean containers.
Gasoline with Ethanol
Two types of gasoline are commonly available in the U.S.A.,
Canada, Australia and New Zealand for use in automobiles
and boats: conventional gasoline without Ethanol and gaso-
line with Ethanol, which is typically referred to as E10 gaso-
line. According to federal regulations, E10 gasoline may
contain up to 10% Ethanol.
A high quality gasoline without Ethanol is the preferred fuel
for your Yamaha outboard motor. However, if gasoline with
Ethanol is the only fuel available in your area, your Yamaha
outboard motor is calibrated to run properly on fresh E10
gasoline that meets the minimum octane requirement spec-
ified for this model.
NOTICE
ECM02402
Never use a gasoline for your outboard motor that con-
tains more than 10% Ethanol, such as E15 which con-
tains 15% Ethanol or E85 which contains 85% Ethanol,
or gasoline containing any amount of Methanol. These
fuels can cause starting and running problems, as well
as serious fuel system and internal engine damage.
Gasoline containing ethanol has several properties that may
cause boat fuel system problems.
Ethanol is a strong solvent (cleaning agent) that can clean
gum and varnish deposits from a boat’s fuel system, par-
ticularly in older boats, as well as tanks and pipes used in
gasoline distribution. These released deposits contami-
nate the fuel and can cause problems, such as clogged
fuel filters, carburetors, or fuel injectors, which could result
in engine damage.
Ethanol may dissolve resins used in the construction of fi-
berglass fuel tanks. The dissolved resins contaminate the
fuel and can cause problems, such as clogged fuel filters,
carburetors, or fuel injectors, which could result in engine
damage.
Ethanol is hygroscopic (has a strong attraction to water).
Therefore, any water that inadvertently enters the fuel sys-
tem, including moisture that is absorbed from the air, will
mix with the ethanol in the gasoline. If the amount of water
is excessive, the ethanol and water mixture will separate
from the gasoline in a layer at the bottom of the fuel tank.
This ethanol and water mixture is very corrosive to alumi-
num fuel tanks and fuel system components.
The usable life span of E10 gasoline may be shorter than
the normal length of off-season boat storage, causing
starting and running problems related to stale fuel.
For more information on using fuel containing ethanol, visit:
http://www.yamaha-motor.com
Gasoline Filtration
Yamaha outboard motors are equipped with internal fuel fil-
ters. However, excessive water or debris entering your en-
gine’s fuel system could prematurely clog the internal filters,
causing starting and running problems, fuel system damage,
and internal engine damage. Therefore, it is recommended
that an external 10-micron water-separating fuel filter be in-
stalled on your boat and serviced frequently. Consult your
authorized Yamaha dealer for a 10-micron filter that meets
your engine’s requirements.
EMU41342
Gasoline Additives
Gasoline blends change to meet automobile emission regu-
lations and economic conditions. Additives, added by gaso-
line distributors, necessary for proper automobile engine
operation and durability, may not be sufficient for typical
boat applications. Intake valve and combustion chamber
deposits may accumulate in boat engines more rapidly than
encountered in automotive use. In addition, gasoline used
for boating will typically age longer between refills than gas-
oline used in automobiles, resulting in stale and unusable
gasoline that may cause starting and running problems, fuel
system damage, and internal engine damage.
Yamaha recommends the use of two Yamalube gasoline ad-
ditives to reduce internal deposits and extend the storage
life of gasoline. Continuous use of Yamalube Ring Free Fuel
Recommended fuel:
Premium unleaded gasoline
Min. pump octane number (PON):
89
Recommended fuel:
Premium unleaded gasoline
Min. research octane number (RON):
94
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Specifications and requirements
14
Additive Plus reduces harmful internal deposits. Yamalube
Fuel Stabilizer & Conditioner Plus added to fresh gasoline
will help protect the fuel system from varnishing while help-
ing to keep the gasoline’s octane level from decreasing ex-
cessively during storage. Other additives may also be
available on the market that may have varying degrees of ef-
fectiveness. Consult your Yamaha dealer concerning what
may work best for the locally available gasoline and environ-
mental conditions.
EMU41354 Anti-fouling paint
A clean hull is required to maintain your boat’s performance.
Boats moored in the water should be protected from marine
growth (barnacles, mussels, and marine plants). If approved
by regulations for your area, the bottom of the hull can be
coated with an anti-fouling paint to inhibit marine growth.
Anti-fouling paints specifically formulated for use on alumi-
num may be applied to the outboard motor. The original
Yamaha paint surface may be scuffed lightly before applying
anti-fouling paint, but do not remove the original paint. Re-
moval of the original paint will increase the rate of corrosion.
NOTICE
ECM04821
Anti-fouling paint for fiberglass and wood may contain
materials, such as copper, graphite, and tin, that can
cause corrosion if applied to aluminum boats and out-
board motor components. Never apply these types of
paint to your outboard motor because rapid corrosion
damage could occur.
Anti-fouling paint can increase drag (friction) between
the boat and the water, and possibly affect perfor-
mance. If the effects are too great, reducing propeller
pitch may be necessary.
Sacrificial anodes are attached to the outboard motor to
provide corrosion protection and must never be painted.
Sacrificial anodes made from a different material may be
necessary for maximum corrosion protection due to your lo-
cal water conditions. Please consult your Yamaha dealer.
NOTICE
ECM02421
Painted sacrificial anodes will not provide corrosion pro-
tection.
EMU40302
Outboard motor disposal requirements
Never illegally discard (dump) the outboard motor. Yamaha
recommends consulting the dealer about discarding the
outboard motor.
EMU36353 Emergency equipment
Keep the following items onboard in case there is trouble
with the outboard motor.
A tool kit with assorted screwdrivers, pliers, wrenches (in-
cluding metric sizes), and electrical tape.
Waterproof flashlight with extra batteries.
An extra engine shut-off cord (lanyard) with clip.
Spare parts, such as an extra set of spark plugs.
Consult your Yamaha dealer for details.
EMU25223 Emission control information
EMU25232
This engine conforms to U.S. Environmental Protection
Agency (EPA) regulations for marine SI engines. See the la-
bel affixed to your engine for details.
EMU25254
Approval label of emission control certificate
This label is attached at the location shown.
New Technology; (4-stroke) DFI
EMU25275
Star labels
Your outboard motor is labeled with a California Air Resourc-
es Board (CARB) star label. See below for a description of
your particular label.
1. Approval label location
1
EMISSION CONTROL INFORMATION
THIS ENGINE CONFORMS TO CALIFORNIA EXHAUST
AND U.S. EPA EXHAUST AND EVAP REGULATIONS FOR SI
MARINE ENGINES. REFER TO OWNER’S MANUAL FOR
MAINTENANCE SPECIFICATIONS AND ADJUSTMENTS.
FAMILY : DISPLACEMENT : liters
MAX POWER : kW FEL : HC+NOx ,CO g/kW-h
EPA CERTIFIED EVAP COMPONENTS :
YAMAHA MOTOR CO.,LTD.
ZMU06894
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Specifications and requirements
15
EMU40331
One Star—Low Emission
The one-star label identifies engines that meet the Air Re-
sources Board’s Personal Watercraft and Outboard marine
engine 2001 exhaust emission standards. Engines meeting
these standards have 75% lower emissions than conven-
tional carbureted two-stroke engines. These engines are
equivalent to the U.S. EPA’s 2006 standards for marine en-
gines.
EMU40341
Two Stars—Very Low Emission
The two-star label identifies engines that meet the Air Re-
sources Board’s Personal Watercraft and Outboard marine
engine 2004 exhaust emission standards. Engines meeting
these standards have 20% lower emissions than One Star-
Low-Emission engines.
EMU40351
Three Stars—Ultra Low Emission
The three-star label identifies engines that meet the Air Re-
sources Board’s Personal Watercraft and Outboard marine
engine 2008 exhaust emission standards or the Sterndrive
and Inboard marine engine 2003-2008 exhaust emission
standards. Engines meeting these standards have 65% low-
er emissions than One Star-Low-Emission engines.
EMU33862
Four Stars—Super Ultra Low Emission
The four-star label identifies engines that meet the Air Re-
sources Board’s Sterndrive and Inboard marine engine 2009
exhaust emission standards. Personal Watercraft and Out-
board marine engines may also comply with these stan-
dards. Engines meeting these standards have 90% lower
emissions than One Star-Low-Emission engines.
1. Star label location
1
ZMU01702
ZMU01703
ZMU01704
ZMU05663
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