Yamaha 4 Stroke Owners Manual

							Safety information
6
Overtaking
If you are passing another vessel, you are the
“Give-Way” vessel. This means that the other
vessel is expected to maintain 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.
EMU25531Other 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 pro-
longed blast on the whistle (4 to 6 seconds). If
another vessel is around the bend, it too
should sound the whistle. Even if no reply is
heard, however, the vessel should still pro-
ceed around the bend with caution. If you nav-
igate 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 considered to be “fishing vessels”
under the International Rules. Vessels with
trolling lines are not considered fishing ves-
sels. Fishing vessels have the right-of-way re-
gardless of position. Fishing vessels cannot,
however, impede the passage of other ves-
sels 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 navigate
only in such a channel.
Reading buoys and other markers
The waters of the United States are marked
for safe navigation by the lateral system of
buoyage. Simply put, buoys and markers
have an arrangement of shapes, colors, num-
bers and lights to show which side of the buoy
a boater should pass on when navigating in a
particular direction. The markings 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 starboard (right) side when
proceeding from open water into port, and
black buoys are to port (left) side. When navi-
gating out of port, your position with respect to
the buoys should be reversed; red buoys
should be to port and black buoys to star-
board.
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							Safety information
7
Many bodies of water used by boaters are en-
tirely within the boundaries of a particular
state. The Uniform State Waterway Marking
System has been devised for these waters.
This system uses buoys and signs with dis-
tinctive shapes and colors to show regulatory
or advisory information. These markers arewhite with black letters and orange boarders.
They signify speed zones, restricted areas,
danger areas, and general information.
Remember, markings may vary by geograph-
ic location. Always consult local boating au-
thorities before driving your boat in unfamiliar
waters.
ZMU01708
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							General information
8
EMU25171
Identification numbers recordEMU25183Outboard 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 sto-
len.
1. Outboard motor serial number location
ZMU06705
1
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							General information
9
EMU33520
Read manuals and labels
Before operating or working on this 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.
EMU33831Warning labels
If these labels are damaged or missing, contact your Yamaha dealer for replacements.
F4, F6
4 
1
2
3
ZMU06709
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							General information
10
ZMU06860
12
3
4
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							General information
11
EMU35132Symbols
The following symbols mean as follows.
Notice/Warning
Read Owner’s Manual
Hazard caused by continuous rotationElectrical hazard
ZMU05696
ZMU05664
ZMU05665
ZMU05666
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							Specifications and requirements
12
EMU38090
Specifications
TIP:
“(AL)” stated in the specification data below
represents the numerical value for the alumi-
num propeller installed.
TIP:
“*” means, select the engine oil referring to the
chart of engine oil paragraph. For further infor-
mation, see page 14.
EMU2821G
Dimension:
Overall length:
557 mm (21.9 in)
Overall width:
329 mm (13.0 in)
Overall height S:
1039 mm (40.9 in)
Overall height L:
1166 mm (45.9 in)
Transom height S:
435 mm (17.1 in)
Transom height L:
562 mm (22.1 in)
Weight (AL) S:
27.0 kg (60 lb)
Weight (AL) L:
28.0 kg (62 lb)
Performance:
Full throttle operating range:
F4MHA 4000–5000 r/min
F6MHA 4500–5500 r/min
Maximum output:
F4MHA 2.9 kW@4500 r/min (4 
HP@4500 r/min)
F6MHA 4.4 kW@5000 r/min (6 
HP@5000 r/min)
Idle speed (in neutral):
1500 ±50 r/minEngine:
Type:
4-stroke S
Displacement:
139.0 cm³
Bore × stroke:
62.0 × 46.0 mm (2.44 × 1.81 in)
Ignition system:
CDI
Spark plug (NGK):
CR6HSB
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
Control system:
Tiller handle
Starting system:
Manual starter
Starting carburetion system:
Choke valve
Valve clearance (cold engine) IN:
0.08–0.12 mm (0.0032–0.0047 in)
Valve clearance (cold engine) EX:
0.08–0.12 mm (0.0032–0.0047 in)
Drive unit:
Gear positions:
Forward-neutral-reverse
Gear ratio:
2.08(27/13)
Trim and tilt system:
Manual tilt
Propeller mark:
BA
Fuel and oil:
Recommended fuel:
Regular gasoline
Min. pump octane:
86
Fuel tank capacity (built in type):
1.1 L (0.29 US gal, 0.24 Imp.gal)
Recommended engine oil:
4-stroke outboard motor oil
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							Specifications and requirements
13
Recommended engine oil group 1*:
SAE 10W-30/10W-40/5W-30 
API SE/SF/SG/SH/SJ/SL
Recommended engine oil group 2*:
SAE 15W-40/20W-40/20W-50 
API SH/SJ/SL
Engine oil quantity:
0.6 L (0.63 US qt, 0.53 Imp.qt)
Lubrication:
Wet sump
Recommended gear oil:
Hypoid gear oil SAE#90
Gear oil quantity:
0.100 L (0.106 US qt, 0.088 Imp.qt)
Tightening torque for engine:
Spark plug:
13.0 Nm (1.33 kgf-m, 9.6 ft-lb)
Engine oil drain bolt:
18.0 Nm (1.84 kgf-m, 13.3 ft-lb)
EMU33554
Installation requirementsEMU33563Boat horsepower rating
WARNING
EWM01560
Overpowering a boat can cause severe in-
stability.
Before installing the outboard motor(s), con-
firm that the total horsepower of your motor(s)
does not exceed the boats maximum horse-
power rating. See the boat’s capacity plate or
contact the manufacturer.
EMU40170Mounting the outboard motor
WARNING
EWM02430
Improper mounting of the outboard motor
could result in hazardous conditions,
such as poor handling, loss of control, or
fire hazards. If you are not able to mount
the outboard motor properly, consult a
Yamaha dealer.
To lift and mount the outboard motor, two
people are necessary. For further information,
see page 26.
EMU34194
Propeller selection
Next to selecting an outboard motor, selecting
the right propeller is one of the most important
purchasing decisions a boater can make. The
type, size, and design of your propeller have
a direct impact on acceleration, top speed,
fuel economy, and even engine life. Yamaha
designs and manufactures propellers for ev-
ery Yamaha outboard motor and every appli-
cation.
Your outboard motor came with a Yamaha
propeller selected to perform well over a
range of applications, but there may be uses
where a different propeller would be more ap-
propriate.
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 boat-
load. 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 engine run in the proper range for your
maximum load but remember that you may
need to reduce your throttle setting to stay
within the recommended engine speed range
when carrying lighter loads.
To check the propeller, see page 61.
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							Specifications and requirements
14
EMU39190
Start-in-gear protection
Yamaha outboard motors are equipped with
start-in-gear protection device. This feature
permits the engine to be started only when it
is in neutral. Always select neutral before
starting the engine.
EMU39691
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 in recommended engine oil group
1 are not available, select an alternative oil
grade from recommended engine oil group 2.Recommended engine oil group 1
Recommended engine oil group 2EMU36360
Fuel requirementsEMU40180Gasoline
Use a good quality gasoline that meets the
minimum octane rating. If knocking or pinging
occurs, use a different brand of gasoline or
premium unleaded fuel. Yamaha recomends
that you use alcohol-free (see Gasohol) gas-
oline whenever possible.
NOTICE
ECM01981

Do not use leaded gasoline. Leaded gas-
oline can seriously damage the engine.
1. Propeller diameter in inches
2. Propeller pitch in inches
3. Type of propeller (propeller mark)
Recommended engine oil:
4-stroke outboard motor oil
Recommended engine oil group 1*:
SAE 10W-30/10W-40/5W-30 
API SE/SF/SG/SH/SJ/SL
Recommended engine oil group 2*:
SAE 15W-40/20W-40/20W-50 
API SH/SJ/SL
Engine oil quantity:
0.6 L (0.63 US qt, 0.53 Imp.qt)
ZMU06853
- x
123
Recommended fuel:
Regular gasoline
Min. pump octane:
86
ZMU06854
ZMU06855
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							Specifications and requirements
15

Avoid getting water and contaminants in
the fuel tank. Contaminated fuel can
cause poor performance or engine dam-
age. Use only fresh gasoline that has
been stored in clean containers.
Gasohol
There are two types of gasohol: gasohol con-
taining ethanol (E10) and that containing
methanol. Ethanol can be used if the ethanol
content does not exceed 10% and the fuel
meets the minimum octane ratings. E85 is a
fuel containing 85% ethanol and must not be
used in your outboard motor. All ethanol
blends containing more than 10% ethanol can
cause fuel system damage or cause engine
starting and running problems. Yamaha does
not recommend gasohol containing methanol
because it can cause fuel system damage or
engine performance problems.
It is recommended that you install a water-
separating marine fuel filter assembly (10 mi-
cron minimum) between your boat’s fuel tank
and outboard motor when using ethanol. Eth-
anol is known to allow moisture to be ab-
sorbed into boat fuel tanks and systems.
Moisture in the fuel can cause corrosion of
metallic fuel system components, starting and
running complaints and require additional fuel
system maintenance.
EMU27270Ring Free Fuel Additive
Gasoline is a precise blend of many different
substances, each chosen to give certain char-
acteristics. Gasoline blends have been
changing in recent years in response to con-
cerns about pollution and resulting emissions
regulations. One of the most obvious changes
has been the elimination of lead from most fu-
els.As gasoline has changed, the amount of addi-
tives such as aromatics and oxygenates has
increased. These additives are important for
the engines in passenger cars, but they can
have detrimental effects in marine engines,
because of increased deposits in the combus-
tion chamber. When enough deposits collect,
piston rings begin sticking. Performance
drops and engine wear increases dramatical-
ly.
While many additives available may reduce
deposits, Yamaha recommends the use of
Ring Free Fuel Additive, available from your
Yamaha dealer. Ring Free Fuel Additive
has repeatedly proven its ability to clean com-
bustion deposits from inside the engine, nota-
bly the critical piston-ring-land area, and fuel
system components. Follow product labeling
for use instructions.
EMU36330
Anti-fouling paint
A clean hull improves boat performance. The
boat bottom should be kept as clean of marine
growth as possible. If necessary, the boat bot-
tom can be coated with an anti-fouling paint
approved for your area to inhibit marine
growth.
Do not use anti-fouling paint which includes
copper or graphite. These paints can cause
more rapid engine corrosion.
EMU36341
Motor disposal requirements
Never illegally discard (dump) the motor.
Yamaha recommends consulting the dealer
about discarding the motor.
EMU36351
Emergency equipment
Keep the following items onboard in case
there is trouble with the motor.

A tool kit with assorted screwdrivers, pliers,
wrenches (including metric sizes), and
electrical tape.
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