Yamaha 4 Stroke Owners Manual

							Operation
36
4. Align the fuel cock with the portable fuel
tank position.
5. Send fuel to the carburetor by squeezing
the primer pump repeatedly, with the ar-
row pointing up, until you feel it become
firm. While the engine is running, makesure to keep the portable fuel tank hori-
zontal. Otherwise, fuel cannot be drawn
from the fuel tank.
EMU27493Starting engine
WARNING
EWM01600
Before starting the engine, make sure that
the boat is tightly moored and that you can
steer clear of any obstructions. Be sure
there are no swimmers in the water near
you.
EMU39403Manual start
WARNING
EWM01840

Failure to attached engine shut-off cord
could result in a runaway boat if opera-
tor is ejected. Attach the engine shut-off
cord to a secure place on your clothing,
or your arm or leg while operating. Do
not attach the cord to clothing that could
tear loose. Do not route the cord where
it could become entangled, preventing it
from functioning.

Avoid accidentally pulling the cord dur-
ing normal operation. Loss of engine
power means the loss of most steering
control. Also, without engine power, the
1. Fuel hose
2. Fuel joint cap
1. Arrow
1. Portable fuel tank position
ZMU06743
2
1
ZMU068021
1
1. Arrow
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							Operation
37
boat could slow rapidly. This could
cause people and objects in the boat to
be thrown forward.
1. Move the gear shift lever to the neutral
position.
2. Attach the engine shut-off cord to a se-
cure place on your clothing, or your arm
or leg. Then, install the clip on the other
end of the cord to the engine shut-off
switch.
3. Align the engine start mark “” on the
throttle grip with the notch in the tiller han-
dle.
TIP:
If the ambient temperature is -15°C or less,
turn the throttle grip so that the engine start
mark “” is positioned past the notch in the
tiller handle.
4. Pull out the choke knob fully.
1. Neutral position
1
ZMU06749
ZMU06744
1. Start mark “”
2. Notch
1. Choke knob
ZMU06808
12
ZMU06865
ZMU06784
1
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							Operation
38
TIP:
It is not necessary to use the choke when
starting a warm engine, such as immediately
after the outboard motor has been operated
under a load.
5. Pull the manual starter handle slowly until
you feel resistance. Then give a strong
pull straight out to crank and start the en-
gine. If the engine does not start on the
first try, repeat the procedure.
6. After the engine starts, slowly return the
manual starter handle to its original posi-
tion before releasing it.
7. Warm up the engine. For further informa-
tion, see page 38.
8. Return the choke knob to its original posi-
tion gradually.
9. Slowly return the throttle grip to the fully
closed position.
EMU36510
Checks after starting engineEMU36522Cooling water
Check for a steady flow of water from the cool-
ing water pilot hole. A continuous flow of water
from the pilot hole indicates that the water
pump is pumping water through the cooling
water passages. If the cooling water passag-
es are frozen, it may take a while for water to
start flowing out of the pilot hole.
NOTICE
ECM01810
If water is not flowing out of the pilot hole
at all times while the engine is running,
overheating and serious damage could
occur. Stop the engine and check whether
the cooling water inlet on the lower case or
the cooling water pilot hole is blocked.
Consult your Yamaha dealer if the prob-
lem cannot be located and corrected.
EMU27670
Warming up engineEMU40070Warming up
After starting the engine, return the choke
knob to the halfway position. For approxi-
mately the first 5 minutes after starting, warm
up the engine by operating at one fifth throttle
ZMU06746
ZMU06818
1. Cooling water pilot hole
ZMU06747
1
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							Operation
39
or less. After the engine has warmed up, push
the choke knob in fully. Failure to do so will
shorten engine life.
TIP:

If the choke knob is left pulled out after the
engine starts, the engine will stall.

In temperatures of -5°C or less, leave the
choke knob pulled out fully for approximate-
ly 30 seconds after starting.
EMU36531
Checks after engine warm upEMU36540Shifting
While tightly moored, and without applying
throttle, confirm that the engine shifts smooth-
ly into forward and reverse, and back to neu-
tral.
EMU36971Stop switches
Perform the following procedure to check that
the engine stop switch and engine shut-off
switch operate properly.

Start the engine, and then check that the
engine stops when the engine stop button
is pushed.

Restart the engine, and then check that the
engine stops when the clip is pulled from
the engine shut-off switch.

Check that the engine cannot be started
with the clip removed from the engine shut-
off switch.
EMU39342
Shifting
WARNING
EWM00180
Before shifting, make sure there are no
swimmers or obstacles in the water near
you.
NOTICE
ECM02220
Before shifting the outboard motor, turn
the throttle grip to the fully closed position
and let the engine speed return to idle
speed. Otherwise, the shift mechanism
could be damaged.
To shift to forward or reverse
Move the gear shift lever to the forward posi-
tion or reverse position.
To shift to neutral
1. Close the throttle so that the engine
slows to idle speed.
2. Move the gear shift lever to the neutral
position.
1. Forward position
2. Neutral position
3. Reverse position
1. Neutral position
1 23
ZMU06864
1
ZMU06749
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							Operation
40
EMU39881
Stopping boat
WARNING
EWM02321
Do not use the reverse function to slow
down or stop the boat as it could cause
you to lose control, be ejected, or impact
the load or other parts of the boat. This
could increase the risk of serious injury. It
could also damage the shift mechanism.
The boat is not equipped with a separate
braking system. Water resistance stops it af-
ter the throttle lever is moved back to idle. The
stopping distance varies depending on gross
weight, water surface conditions, and wind di-
rection.
EMU27821
Stopping engine
Before stopping the engine, first let it cool off
for a few minutes at idle or low speed. Stop-
ping the engine immediately after operating at
high speed is not recommended.
EMU39412Procedure
1. Push and hold the engine stop button un-
til the engine stops completely. The en-
gine can also be stopped by pulling the
engine shut-off cord and removing the
clip from the engine shut-off switch.2. Tighten the air vent screw on the fuel tank
cap.
3. Align the fuel cock with the closed posi-
tion.
1. Engine stop button
ZMU06726
1
1. Engine shut-off switch
2. Cord
3. Clip
1. Air vent screw
1. Air vent screw
ZMU06867
13
2
ZMU06751
1
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							Operation
41
4. When using a portable fuel tank, discon-
nect the fuel hose, and then install the
fuel joint cap. WARNING! When not us-
ing a portable fuel tank, make sure to
install the fuel joint cap. Otherwise, in-
jury could result from striking the fuel
joint accidentally.
 [EWM02411]
EMU40110
Trimming outboard motor
WARNING
EWM00740
Excessive trim for the operating condi-
tions (either trim up or trim down) can
cause boat instability and can make steer-
ing the boat more difficult. This increases
the possibility of an accident. If the boat
begins to feel unstable or is hard to steer,
slow down and/or readjust the trim angle.
The trim angle of the outboard motor helps
determine the position of the bow of the boat
in the water. The correct trim angle is affected
by variables, such as the load in the boat, sea
conditions, and running speed.
EMU39272Adjusting trim angle for manual tilt 
models
WARNING
EWM00400

Stop the engine before adjusting the
trim angle.

Use care to avoid being pinched when
removing or installing the rod.

Use caution when trying a trim position
for the first time. Increase speed gradu-
ally and watch for any signs of instability
or control problems. Improper trim an-
gle can cause loss of control.
1. Closed position
1. Fuel hose
2. Fuel joint cap
ZMU068711
1
ZMU06753
2
1
1. Trim operating angle
ZMU06754
1
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							Operation
42
There are 5 holes provided in the clamp
bracket to adjust the outboard motor trim an-
gle.
1. Stop the engine.
2. Tilt the outboard motor up, and then re-
move the trim rod from the clamp bracket.
3. Change the position of the trim rod in di-
rection “A” to raise the bow (“trim-out”).
Change the position of the trim rod in di-
rection “B” to lower the bow (“trim-in”).
TIP:
The outboard motor trim angle changes ap-
proximately 4 degrees when the trim rod posi-
tion is changed by 1 hole.
4. Make test runs with the outboard motor
set at different trim angles to find the po-
sition that works best for your boat and
operating conditions.
EMU40121Adjusting boat trim
Generally, a boat is stable when the keel line
of the boat is up about 3 to 5 degrees. With
the bow up, the boat may have a greater ten-
dency to steer to one side or the other. If this
occurs, adjust the trim angle.Bow Up
Too much trim-out puts the bow of the boat
too high in the water. Excessive trim-out can
also cause the propeller to ventilate, which re-
duces performance further, and the boat may
“porpoise” (hop in the water), which could
throw the operator and passengers over-
board.
Bow Down
Too much trim-in causes the boat to “plow”
through the water, decreasing fuel economy
and making it hard to increase speed. Resis-
tance at the bow is greatly increased, height-
ening the danger of “bow steering” and
making operation difficult and dangerous.
1. Trim rod
ZMU067551A
B
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							Operation
43
EMU39592
Tilting up and down
If the engine will be stopped for some time or
if the boat is moored in shallows, the outboard
motor should be tilted up to protect the propel-
ler and lower case from damage due to colli-
sions with obstructions, and also to reduce
salt corrosion.
WARNING
EWM00222
Make sure that no one is near the outboard
motor when tilting the outboard motor up
or down. Otherwise, body parts could be
crushed between the outboard motor and
the clamp bracket.
WARNING
EWM02312
Leaking fuel is a fire hazard. When the out-
board motor will be tilted up for more than
a few minutes, tighten the air vent screwand fuel tank cap and align the fuel cock
with the closed position. Otherwise, fuel
may leak.
NOTICE
ECM02161

Before tilting the outboard motor up, fol-
low the procedure under “Stopping en-
gine” in this chapter. Never tilt the
outboard motor up while the engine is
running. Severe damage from overheat-
ing can result.

Do not tilt the outboard motor up by
pushing the tiller handle because this
could break the handle.

The outboard motor cannot be tilted
when in reverse.
EMU39552Procedure for tilting up
1. Align the fuel cock with the closed posi-
tion.
2. Move the gear shift lever to the neutral
position.
ZMU06840
1. Closed position
ZMU068711
1
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							Operation
44
3. To prevent steering movement, turn the
steering friction adjuster clockwise.
4. Tighten the air vent screw.
5. When using a portable fuel tank, discon-
nect the fuel hose, and then install the
fuel joint cap. WARNING! When not us-
ing a portable fuel tank, make sure toinstall the fuel joint cap. Otherwise, in-
jury could result from striking the fuel
joint accidentally.
 [EWM02411]
6. Hold the rear of the top cowling and fully
tilt the outboard motor up. Slightly lower
the outboard motor from the fully tilted up
position and fit the tilt support bar secure-
ly into the holder located on the clamp
bracket.
EMU39571Procedure for tilting down
1. Slightly tilt the outboard motor up.
2. Slowly tilt the outboard motor down while
pulling the tilt support bar up.
1. Neutral position
1. Steering friction adjuster
1. Air vent screw
1
ZMU06749
ZMU06827
1
ZMU06751
1
1. Fuel hose
2. Fuel joint cap
1. Tilt support bar
2. Holder
ZMU06753
2
1
ZMU06829
1
2
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							Operation
45
3. Turn the steering friction adjuster coun-
terclockwise to set the steering friction
according to operator preference.
WARNING! If there is too much resis-
tance it could be difficult to steer,
which could result in an accident.
[EWM00721]
EMU28061
Shallow waterEMU39891Cruising in shallow water
WARNING
EWM02391

Operate the boat at the lowest possible
speed when cruising in shallow water.
Hitting an underwater obstacle could
cause the outboard motor to lift out of
the water, resulting in loss of control.

When cruising in shallow water, do not
operate in reverse. Reverse thrust can
cause the outboard motor to lift out of
the water, increasing the chance of an
accident and personal injury.
NOTICE
ECM00260
Do not tilt the outboard motor up so that
the cooling water inlet on the lower unit is
above the surface of the water when set-
ting up for and cruising in shallow water.
Otherwise severe damage from overheat-
ing can result.
EMU39583Procedure for shallow water cruising
1. Move the gear shift lever to the neutral
position.
1. Tilt support bar
1. Steering friction adjuster
ZMU06833
1
ZMU06834
1
1. Cooling water inlet
1. Neutral position
ZMU068191
1
ZMU06749
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