Yamaha E70 Owners Manual

							Operation
65
EMU27885
Adjusting trim angle (Power trim and 
tilt)
WA R N I N G
EWM00753
●Be sure all people are clear of the out-
board motor when adjusting the trim
angle. Body parts can be crushed be-
tween the motor and the clamp bracket
when the motor is trimmed or tilted.
●Use caution when trying a trim position
for the first time. Increase speed gradu-
ally and watch for any signs of instabil-
ity or control problems. Improper trim
angle can cause loss of control.
●If equipped with a power trim and tilt
switch located on the bottom cowling,
use the switch only when the boat is at
a complete stop with the engine off. Do
not adjust the trim angle with this
switch while the boat is moving.
Adjust the outboard motor trim angle using
the power trim and tilt switch.
To raise the bow (trim-out), press the switch
“” (up).
1. Trim operating angle
1
ZMU03633
1. Power trim and tilt switch
1. Power trim and tilt switch
1. Power trim and tilt switch
UP
DN
ZMU03634
1
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							Operation
66
To lower the bow (trim-in), press the switch
“ ” (down).
Make test runs with the trim set to different
angles to find the position that works best for
your boat and operating conditions.
EMU27912
Adjusting boat trim
When the boat is on plane, a bow-up attitude
results in less drag, greater stability and effi-
ciency. This is generally when the keel line of
the boat is up about 3 to 5 degrees. With the
bow up, the boat may have a greater tenden-
cy to steer to one side or the other. Compen-
sate for this as you steer. When the bow of
the boat is down, it is easier to accelerate
from a standing start onto plane.
Bow Up
Too much trim-out puts the bow of the boat
too high in the water. Performance and econ-
omy are decreased because the hull of the
boat is pushing the water and there is more
air drag. Excessive trim-out can also cause
the propeller to ventilate, which reduces per-
formance further, and the boat may “por-
poise” (hop in the water), which could throw
the operator and passengers overboard.Bow Down
Too much trim-in causes the boat to “plow”
through the water, decreasing fuel economy
and making it hard to increase speed. Oper-
ating with excessive trim-in at higher speeds
also makes the boat unstable. Resistance at
the bow is greatly increased, heightening the
danger of “bow steering” and making opera-
tion difficult and dangerous.
TIP:
Depending on the type of boat, the outboard
motor trim angle may have little effect on the
trim of the boat when operating.
EMU27935
Tilting up and down
If the engine will be stopped for some time or
if the boat is moored in shallows, the out-
board motor should be tilted up to protect the
propeller and lower casing from damage by
collision with obstructions, and also to re-
duce salt corrosion.
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							Operation
67
WA R N I N G
EWM00222
Make sure that no one is near the out-
board motor when tilting the outboard
motor up or down. Otherwise, body parts
could be crushed between the outboard
motor and the clamp bracket.
WA R N I N G
EWM00250
Leaking fuel is a fire hazard. If there is a
fuel joint on the outboard motor, discon-
nect the fuel line or close the fuel cock if
the engine will be tilted for more than a
few minutes. Otherwise fuel may leak.
NOTICE
ECM00241
●Before tilting the outboard motor, stop
the engine by following the procedure
on page 63. Never tilt the outboard mo-
tor while the engine is running. Severe
damage from overheating can result.
●Do not tilt up the engine by pushing the
tiller handle (if equipped) because this
could break the handle.
EMU32724
Procedure for tilting up (power trim 
and tilt models)
1. Place the remote control lever / gear
shift lever in neutral.2. Press the power trim and tilt switch “ ”
(up) until the outboard motor has tilted
up completely.
N
ZMU03196
UP
ZMU03639
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							Operation
68
3. Pull the tilt support lever toward you to
support the engine. WARNING! After
tilting the outboard motor, be sure to
support it with the tilt support knob or
tilt support lever. Otherwise the out-
board motor could fall back down
suddenly if oil in the power trim and
tilt unit or in the power tilt unit loses
pressure.
 [EWM00262] NOTICE: Do not use
the tilt support lever or knob when
trailering the boat. The outboard mo-
tor could shake loose from the tilt
support and fall. If the motor cannot
be trailered in the normal running po-
sition, use an additional support de-
vice to secure it in the tilt position.
For more detailed information, see
page 71.
 [ECM01641] 
4. Models equipped with trim rods: Once
the outboard motor is supported with the
tilt support lever, press the power trimand tilt switch “ ” (down) to retract the
trim rods. NOTICE: Make sure that the
trim rods retracts completely during
mooring. This protects the rods from
marine growth and corrosion, which
could damage the power trim and tilt
mechanism.
 [ECM00252] EMU33121
Procedure for tilting down (power 
trim and tilt models)
1. Push the power trim and tilt switch “ ”
(up) until the outboard motor is support-
ed by the tilt rod and the tilt support lever
becomes free.
2. Release the tilt support lever.
3. Push the power trim and tilt switch “ ”
(down) to lower the outboard motor to
the desired position.
ZMU03640
ZMU03644
DN
ZMU01936
UPDN
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							Operation
69
EMU28061
Shallow water
EMU32851
Power trim and tilt models
The outboard motor can be tilted up partially
to allow operation in shallow water.
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.
EMU32913
Procedure for power trim and tilt models
1. Place the remote control lever / gear
shift lever in neutral.2. Slightly tilt the outboard motor up to the
desired position using the power trim
and tilt switch. WARNING! Using the
power trim and tilt switch on the bot-
tom cowling while the boat is moving
or engine is on could increase the
risk of falling overboard and could
distract the operator, increasing the
risk of collision with another boat or
an obstacle.
 [EWM01850] 
DN
ZMU03645
UP
ZMU01935
UPDN
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							Operation
70
3. To return the outboard motor to the nor-
mal running position, press the power
trim and tilt switch and slowly tilt the out-
board motor down.
EMU35391
Cruising in other conditions
Cruising in salt water
After operating in salt water, flush the cooling
water passages with fresh water to prevent
them from becoming clogged. Also rinse the
outside of the outboard motor with fresh wa-
ter.
Cruising in muddy, turbid, or acidic water
Water in some areas can be acidic or with a
lot of sediment in it, such as muddy or turbid
(cloudy) water. After operating in such water,
flush the cooling passages with fresh water
to prevent corrosion. Also rinse the outside
of the outboard motor with fresh water.
UP
ZMU03650
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							71
Maintenance
EMU41510
Transporting and storing 
outboard motor
WA R N I N G
EWM02620
●USE CARE when transporting fuel tank,
whether in a boat or car.
●DO NOT fill fuel container to maximum
capacity. Gasoline will expand consid-
erably as it warms up and can build up
pressure in the fuel container. This can
cause fuel leakage and a potential fire
hazard.
●Leaking fuel is a fire hazard. When
transporting and storing the outboard
motor, disconnect the fuel line from the
outboard motor to prevent fuel from
leaking.
●Never get under the outboard motor
while it is tilted. Severe injury could oc-
cur if the outboard motor accidentally
falls.
●Do not use the tilt support lever or knob
when trailering the boat. The outboard
motor could shake loose from the tilt
support and fall. If the outboard motor
cannot be trailered in the normal run-
ning position, use an additional sup-
port device to secure it in the tilt
position.
When storing or transporting the outboard
motor, make sure to follow the procedure list-
ed below.
●Disconnect the fuel line from the outboard
motor.
●Tighten the fuel tank cap and its air vent
screw.
●When the outboard motor is tilted pro-
longed time for mooring or trailering the
boat, disconnect the fuel line from the out-
board motor. Tighten the fuel tank cap and
its air vent screw.
The outboard motor should be transported
and stored in the normal running position. If
there is insufficient road clearance in this po-
sition, then trailer the outboard motor in the
tilt position using a motor support device
such as a transom saver bar. Consult your
Yamaha dealer for further details.
EMU28280
Storing outboard motor
When storing your Yamaha outboard motor
for prolonged periods of time (2 months or
longer), several important procedures must
be performed to prevent excessive damage.
It is advisable to have your outboard motor
serviced by an authorized Yamaha dealer
prior to storage. However, you, the owner,
with a minimum of tools, can perform the fol-
lowing procedures.
NOTICE
ECM01080
●To prevent problems which can be
caused by oil entering the cylinder from
ZMU03659
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							Maintenance
72
the sump, keep the outboard motor in
the attitude shown when transporting
and storing it. If storing or transporting
the outboard motor on its side (not up-
right), put it on a cushion after draining
the engine oil.
●Do not place the outboard motor on its
side before the cooling water has
drained from it completely, otherwise
water may enter the cylinder through
the exhaust port and cause engine trou-
ble.
●Store the outboard motor in a dry, well-
ventilated place, not in direct sunlight.
EMU28305
ProcedureEMU30007
Flushing with the flushing attachment
1. Wash the outboard motor body using
fresh water. NOTICE: Do not spray wa-
ter into the air intake.
 [ECM01840] For fur-
ther information, see page 75.
2. Fill the fuel tank with fresh fuel and add
one ounce of “Yamaha Fuel Conditioner
and Stabilizer” to each gallon of fuel.
TIP:
The use of “Yamaha Fuel Conditioner and
Stabilizer” eliminates the need to drain the
fuel system. Consult your Yamaha dealer or
other qualified mechanic if the fuel system is
to be drained instead.
3. Remove the top cowling and propeller.
4. Install the flushing attachment over the
cooling water inlet. NOTICE: Do not run
the engine without supplying it with
cooling water. Either the engine water
pump will be damaged or the engine
will be damaged from overheating.
Before starting the engine, be sure to
supply water to the cooling water
passages. Avoid running the out-board motor at high speed while on
the flushing attachment, otherwise
overheating could occur.
 [ECM02000] 
5. Cooling system flushing is essential to
prevent the cooling system from clog-
ging up with salt, sand, or dirt. In addi-
tion, fogging/lubricating of the engine is
mandatory to prevent excessive engine
damage due to rust. Perform the flush-
ing and fogging at the same time.
WARNING! Do not touch or remove
electrical parts when starting or dur-
ing operation. Keep hands, hair, and
clothes away from the flywheel and
other rotating parts while the engine
is running.
 [EWM00091] 
TIP:
●When using the flushing attachment, main-
tain adequate water pressure and a steady
water flow.
●If the overheat alert device is activated,
turn the engine off, and consult your
Yamaha dealer.
6. Run the engine at a fast idle for a few
minutes in neutral position while supply-
ing fresh water.
7. Just prior to turning off the engine, quick-
ly spray “Yamaha Stor-Rite Engine
Fogging Oil” alternately into the intake
1. Flushing attachment
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							Maintenance
73
silencer or the fogging hole of the silenc-
er cover, if equipped. When properly
done, the engine will smoke excessively
and almost stall.
8. Remove the flushing attachment and
wipe off any excess water.
9. Install the top cowling and propeller.
10. Drain the cooling water completely out of
the motor. Clean the body thoroughly.
TIP:
A flushing attachment is available from your
Yamaha dealer.
EMU28402
Lubrication
1. Install the spark plug(s) and torque to
proper specification. For information on
spark plug installation, see page 82.
2. Change the gear oil. For instructions,
see page 87. Inspect the oil for the pres-
ence of water that indicates a leaky seal.
Seal replacement should be performed
by an authorized Yamaha dealer prior to
use.
3. Grease all grease fittings. For further de-
tails, see page 80.
TIP:
For long-term storage, fogging the engine
with oil is recommended. Contact your
Yamaha dealer for information about fogging
oil and procedures for your engine.
EMU30266
Cleaning and anticorrosion 
measures
1. Wash down the exterior of the outboard
motor with fresh water and dry off com-
pletely. NOTICE: Do not spray water
into the air intake.
 [ECM01840] 
2. Spray the outboard motor exterior with
“Yamaha Silicone Protectant”. NOTICE:
Do not spray when the engine is run-
ning. Also, do not spray near the si-
lencer or into the engine. Otherwise
the engine could be damaged.
 [ECM01402] 
3. Wax the cowling with a non-abrasive
wax such as “Yamaha Silicone Wax”.
EMU28444
Flushing power unit
Perform this procedure right after operation
for the most thorough flushing.
NOTICE
ECM01530
Do not perform this procedure while the
engine is running. The water pump may
be damaged and severe damage from
overheating can result.
1. After shutting off the engine, unscrew
the garden hose connector from the fit-
ting on the bottom cowling.
ZMU07083
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							Maintenance
74
2. Screw the garden hose adapter onto a
garden hose, which is connected to a
fresh water supply, and then connect it
to the garden hose connector.
3. With the engine off, turn on the water tap
and let the water flush through the cool-
ing passages for about 15 minutes. Turn
off the water and disconnect the garden
hose adapter from the garden hose con-
nector.
4. Reinstall the garden hose connector
onto the fitting on the bottom cowling.
Tighten the connector securely.
NOTICE: Do not leave the garden
hose connector loose on the bottom
cowling fitting or let the hose hang
free during normal operation. Water
will leak out of the connector instead
1. Fitting
2. Garden hose adapter
3. Garden hose connector
1
32
ZMU05096
1. Fitting
2. Garden hose adapter
3. Garden hose connector
1
3 2
ZMU07087
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