Yamaha F 40 User Guide

							 
Operation 
35 
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.
NOTE:
 
 
When the engine is cold, it needs to be
warmed up. For further information, see
page 35. 
 
If the engine is warm and fails to start,
open the throttle slightly and try to start the
engine again. If the engine still fails to 
start, see page 70. 
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 the
cooling 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 coolingpassages. 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 
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). 
EMU27764 
Forward (tiller handle and remote 
control models) 
Tiller handle models
1. Place the throttle grip in the fully closed
position.
ZMU04051 
						

							 
Operation 
36 
2. Move the gear shift lever quickly and
firmly from neutral to forward.
Remote control models
1. Pull up the neutral interlock trigger (if
equipped) and move the remote control
lever quickly and firmly from neutral to
forward.
 
EMU27785 
Reverse (automatic reverse lock and 
power trim and 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 handle models
1. Place the throttle grip in the fully closed
position.
2. Move the gear shift lever quickly and
firmly from neutral to reverse.
ZMU03319
N
F
ZMU03406 
						

							 
Operation 
37 
Remote control models
1. Pull up the neutral interlock trigger (if
equipped) and move the remote control
lever quickly and firmly from neutral to
reverse.
 
EMU27796 
Reverse (manual tilt and hydro tilt 
models)
WARNING
 
EWM00190  
When operating in reverse, go slowly. Donot open the throttle more than half. Oth-
erwise the boat could become unstable,
which could result in loss of control and 
an accident. 
Tiller handle models
1. Place the throttle grip in the fully closed
position.
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.
UPDN
ZMU03909
N
R
ZMU03407
ZMU04054 
						

							 
Operation 
38 
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-
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).
ZMU04053
UPDN
ZMU03909
N
R
ZMU03627
ON
START
OFF
ZMU03630 
						

							 
Operation 
39 
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 fromthe 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.
ZMU04057
ZMU04058 
						

							 
Operation 
40 
EMU27882 
Adjusting trim angle 
Power trim and tilt models
WARNING
 
EWM00751  
 
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. 
 
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 
1. Trim operating angle
1
ZMU04059
 
1. Power trim and tilt switch
1. Power trim and tilt switch
1. Power trim and tilt switch
UP
DN
ZMU04060
1 
						

							 
Operation 
41 
“” (up).
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. 
EMU27891 
Adjusting trim angle for hydro tilt 
models
WARNING
 
EWM00490  
 
Stop the engine before adjusting the
trim angle. 
 
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. 
1. Stop the engine.
2. Place the tilt lock lever in the release po-
sition.
3. Hold the rear of the top cowling with one
hand and tilt the engine to the desired
angle.
4. Place the tilt lock lever back into the lock
position to support the engine.To raise the bow (“trim-out”), tilt the engine
up.
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.
ZMU04061 
						

							 
Operation 
42 
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 38. 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. 
EMU27995 
Procedure for tilting up (hydro tilt 
models) 
1. Place the remote control lever / gear
shift lever in neutral.
N
ZMU03087 
						

							 
Operation 
43 
2. Disconnect the fuel line from the out-
board motor.
3. Place the tilt lock lever in the release po-
sition.
4. Hold the rear of the top cowling with one
hand, tilt the engine up, and turn the tilt
support lever toward you or tilt support
knob into the clamp bracket, and then
place the tilt lock lever back into the lock
position to support the outboard motor. 
EMU28007 
Procedure for tilting up (power trim 
and tilt models / power tilt models) 
1. Place the remote control lever / gear
shift lever in neutral.
2. Disconnect the fuel line from the out-
board motor or close the fuel cock.
ZMU04063
ZMU04064
ZMU04065
N
ZMU03196 
						

							 
Operation 
44 
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 / power 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
ZMU04066
UP
ZMU01935
UPDN
UP
ZMU04067
ZMU04068