Yamaha F15 Owners Manual

							 
Operation 
35 
6. Turn the main switch to “” (start),
and hold it for a maximum of 5 seconds.
7. Immediately after the engine starts, re-
lease the main switch and allow it to re-
turn to “” (on).
CAUTION:
 
ECM00191  
 
Never turn the main switch to “”
(start) while the engine is running. 
 
Do not keep the starter motor turning
for more than 5 seconds. If the starter
motor is turned continuously for more
than 5 seconds, the battery will be
quickly discharged, thus making it im-
possible to start the engine. The starter
can also be damaged. If the engine will
not start after 5 seconds of cranking,
return the main switch to “” (on), wait
10 seconds, then crank the engine 
again. 
EMU27670 
Warming up engine 
EMU27710 
Manual start and electric start 
models 
1. After starting the engine, allow it to idle
for 3 minutes to warm up. Failure to do
so will shorten engine life.
2. Be sure the low oil pressure warning in-
dicator goes off after starting the engine.
3. Check for a steady flow of water from thecooling water pilot hole.
CAUTION:
 
ECM00210  
 
If the low oil pressure warning indicator
does not go off after the engine starts,
stop the engine. Otherwise serious en-
gine damage could occur. Check the oil
level and add oil if necessary. Consult
your Yamaha dealer if the cause for the
low oil pressure warning indicator can-
not be found. 
 
A continuous flow of water from the pi-
lot hole shows that the water pump is
pumping water through the cooling
passages. If water is not flowing out of
the pilot hole at all times while the en-
gine is running, overheating and seri-
ous 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. 
EMU27740 
Shifting
WARNING
 
EWM00180  
Before shifting, make sure there are no
swimmers or obstacles in the water near
ZMU02034 
						

							 
Operation 
36 
you.
CAUTION:
 
ECM00220  
To change the boat direction or shifting
position from forward to reverse or vice-
versa, first close the throttle so that the 
engine idles (or runs at low speeds). 
EMU27763 
Forward (tiller handle and remote 
control models) 
Tiller control models
1. Place the throttle grip in the fully closed
position.
2. Move the gear shift lever quickly and
firmly from neutral to forward.Remote control models1. Pull up the neutral interlock trigger (if
equipped) and move the remote control
lever quickly and firmly from neutral to
forward.
 
EMU27795 
Reverse (manual tilt and hydro tilt 
models)
WARNING
 
EWM00190  
When operating in reverse, go slowly. Do
not open the throttle more than half. Oth-
erwise the boat could become unstable,
which could result in loss of control and 
an accident. 
Tiller control models
1. Place the throttle grip in the fully closed
position.
ZMU02030
ZMU02036
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F
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F
ZMU04882 
						

							 
Operation 
37 
2. On models equipped with a tilt lock le-
ver, check that it is in the lock/down po-
sition.
3. Move the gear shift lever quickly and
firmly from neutral to reverse.Remote control models
1. Check that the tilt lock lever is in the lock
position.
2. Pull up the neutral interlock trigger (if
equipped) and move the remote control
lever quickly and firmly from neutral to
reverse.
 
EMU27820 
Stopping engine 
Before stopping the engine, first let it cool off
for a few minutes at idle or low speed. Stop-
ZMU02030
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ZMU02038
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R
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Operation 
38 
ping the engine immediately after operating
at high speed is not recommended. 
EMU27844 
Procedure 
1. Push and hold the engine stop button or
turn the main switch to “” (off).
2. After stopping the engine, disconnect
the fuel line if there is a fuel joint on the
outboard motor.
3. Tighten the air vent screw on the fuel
tank cap (if equipped).4. Remove the key if the boat will be left
unattended.
NOTE:
 
The engine can also be stopped by pulling
the lanyard and removing the lock plate from
the engine stop switch, then turning the main 
switch to “” (off). 
EMU27861 
Trimming outboard motor 
The trim angle of the outboard motor helps
determine the position of the bow of the boat
in the water. Correct trim angle will help im-
prove performance and fuel economy while
reducing strain on the engine. Correct trim
angle depends upon the combination of
boat, engine, and propeller. Correct trim is
also affected by variables such as the load in
the boat, sea conditions, and running speed.
WARNING
 
EWM00740  
Excessive trim for the operating condi-
tions (either trim up or trim down) can
cause boat instability and can make
steering the boat more difficult. This in-
creases 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.
ZMU02083
ZMU02042
ZMU02041 
						

							 
Operation 
39 
EMU27871 
Adjusting trim angle for manual tilt 
models 
There are 4 or 5 holes provided in the clamp
bracket to adjust the outboard motor trim an-
gle.
1. Stop the engine.
2. Remove the trim rod from the clamp
bracket while slightly tilting the outboard
motor up.3. Reposition the rod in the desired hole.
To raise the bow (“trim-out”), move the rod
away from the transom.
To lower the bow (“trim-in”), move the rod to-
ward the transom.
Make test runs with the trim set to different
angles to find the position that works best for
your boat and operating conditions.
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 instabil-
ity or control problems. Improper trim 
angle can cause loss of control.
NOTE:
 
The outboard motor trim angle can be
changed approximately 4 degrees by shifting 
the trim rod one hole. 
EMU27901 
Adjusting trim angle (power tilt 
models)
WARNING
 
EWM00750  
 
Be sure all people are clear of the out-
board motor when adjusting the tilt an-
gle, also be careful not to pinch any
body parts between the drive unit and
clamp bracket. 
 
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. 
 
Use the power tilt switch located on the
bottom engine cowling (if equipped) 
1. Trim operating angle
ZMU02043
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ZMU02007 
						

							 
Operation 
40 
only when the boat is at a complete 
stop with the engine off. 
Tilt the engine to the desired angle using the
power tilt switch.
NOTE:
 
Stay within the trim operating angle when
trimming the outboard motor using the power 
tilt system.
To raise the bow (“trim-out”), tilt the engineup.
To lower the bow (“trim-in”), tilt the engine
down.
Make test runs with the trim set to different
angles to find the position that works best for
your boat and operating conditions. 
EMU27911 
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. The trim tab can
also be adjusted to help offset this effect.
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.
ZMU02811
UP
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Operation 
41 
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.
NOTE:
 
Depending on the type of boat, the outboard
motor trim angle may have little effect on the 
trim of the boat when operating. 
EMU27933 
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 casing from damage by colli-
sion with obstructions, and also to reducesalt corrosion.
WARNING
 
EWM00220  
Be sure all people are clear of the out-
board motor when tilting up and down,
also be careful not to pinch any body
parts between the drive unit and engine 
bracket.
WARNING
 
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.
CAUTION:
 
ECM00241  
 
Before tilting the outboard motor, stop
the engine by following the procedure
on page 37. 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. 
EMU27976 
Procedure for tilting up (manual tilt 
models) 
1. Place the gear shift lever in neutral.
ZMU01988
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Operation 
42 
2. Disconnect the fuel line from the out-
board motor.
3. Place the tilt lock lever (if equipped) in
the release/up position.
4. Pull up the shallow water lever (if
equipped).
5. Hold the rear of the top cowling with one
hand and tilt the engine up fully.
6. Push the tilt support knob into the clamp
bracket. Or the tilt support bar will turn to
the lock position automatically. 
EMU28005 
Procedure for tilting up 
Power trim and tilt models / power tilt models
1. Place the remote control lever / the gear
shift lever in neutral.
2. Disconnect the fuel line from the out-
board motor or close the fuel cock.
N
ZMU04881
ZMU02042
ZMU02044
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ZMU01988
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Operation 
43 
3. Press the power trim and tilt switch /
power tilt switch “” (up) until the out-
board motor has tilted up completely.4. Push the tilt support knob into the clamp
bracket or pull the tilt support lever to-
ward you to support the engine.
WARNING
 
EWM00260  
After tilting the outboard motor, be sure
to support it with the tilt support knob or
tilt support lever. Otherwise the outboard
motor could fall back down suddenly if oil
in the power trim and tilt unit loses pres- 
sure. 
5. Models equipped with trim rods: Once
the outboard motor is supported with the
tilt support lever, press the power trim
and tilt switch “” (down) to retract the
trim rods.
CAUTION:
 
ECM00250  
Be sure to retract the trim rods complete-
ly during mooring. This protects the rods
ZMU02042
ZMU02823
UP
UPZMU04900
ZMU04884 
						

							 
Operation 
44 
from marine growth and corrosion which
could damage the power trim and tilt 
mechanism. 
EMU30190 
Procedure for tilting down (manual 
tilt models) 
1. Place the tilt lock lever in the lock posi-
tion.
2. Slightly tilt the engine up until the tilt sup-
port bar is automatically released.
3. Slowly tilt the engine down. 
EMU28053 
Procedure for tilting down 
Power trim and tilt models / power tilt models
1. Push the power tilt / power trim and tilt
switch “” (up) until the outboard motor
is supported by the tilt rod and the tilt
support lever / tilt support knob becomes
free.
2. Release the tilt support lever or pull out
the tilt support knob.3. Push the power tilt / power trim and tilt
switch “” (down) to lower the outboard
motor to the desired position.
 
EMU28060 
Cruising in shallow water 
The outboard motor can be tilted up partially
to allow operation in shallow water.
ZMU02048
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