Yamaha F50 Manual

							 
Basic components 
15 
trol lever in the neutral position and lift the
neutral throttle lever.
NOTE:
 
The neutral throttle lever will operate only
when the remote control lever is in neutral.
The remote control lever will operate only
when the neutral throttle lever is in the closed 
position. 
EMU25911 
Tiller handle 
To change direction, move the tiller handle to
the left or right as necessary. 
EMU25922 
Gear shift lever 
Pulling the gear shift lever towards you puts
the engine in forward gear so that the boat
moves ahead. Pushing the lever away from
you puts the engine in reverse gear so thatthe boat moves astern. 
EMU25941 
Throttle grip 
The throttle grip is on the tiller handle. Turn
the grip counterclockwise to increase speed
and clockwise to decrease speed. 
EMU25961 
Throttle indicator 
The fuel consumption curve on the throttle
indicator shows the relative amount of fuel
consumed for each throttle position. Choose
the setting that offers the best performance
and fuel economy for the desired operation. 
1. Fully open
2. Fully closed 
1. Forward “ ”
2. Neutral “ ”
3. Reverse “ ” 
						

							 
Basic components 
16 
EMU25971 
Throttle friction adjuster 
A friction device provides adjustable resis-
tance to movement of the throttle grip or the
remote control lever, and can be set accord-
ing to operator preference.
To increase resistance, turn the adjuster
clockwise. To decrease resistance, turn the
adjuster counterclockwise.
WARNING
 
EWM00031  
Do not overtighten the friction adjuster. If
there is too much resistance, it could be
difficult to move the remote control lever
or throttle grip, which could result in an 
accident. 
When constant speed is desired, tighten the
adjuster to maintain the desired throttle set-
ting. 
EMU25990 
Engine stop lanyard switch 
The lock plate must be attached to the en-
gine stop switch for the engine to run. The
lanyard should be attached to a secure place
on the operator’s clothing, or arm or leg.
Should the operator fall overboard or leave
the helm, the lanyard will pull out the lock
plate, stopping ignition to the engine. This
will prevent the boat from running away un-
der power.
WARNING
 
EWM00120  
 
Attach the engine stop switch lanyard
to a secure place on your clothing, or
your arm or leg while operating. 
 
Do not attach the lanyard to clothing
that could tear loose. Do not route the
lanyard where it could become entan-
gled, preventing it from functioning. 
 
Avoid accidentally pulling the lanyard
during normal operation. Loss of en-
gine power means the loss of most
steering control. Also, without engine
power, the boat could slow rapidly. This
could cause people and objects in the 
boat to be thrown forward. 
1. Throttle indicator 
						

							 
Basic components 
17
NOTE:
 
The engine cannot be started with the lock 
plate removed. 
EMU26001 
Engine stop button 
To open the ignition circuit and stop the en-
gine, push this button. 
EMU26090 
Main switch 
The main switch controls the ignition system;
its operation is described below. 
 
“”  
(off) 
With the main switch in the “ ” (off) posi-
tion, the electrical circuits are off, and the key
can be removed. 
 
“”  
(on) 
With the main switch in the “ ” (on) posi-
tion, the electrical circuits are on, and the key
cannot be removed. 
 
“”  
(start) 
With the main switch in the “ ” (start) po-
sition, the starter motor turns to start the en-
gine. When the key is released, it returns
automatically to the “ ” (on) position. 
1. Lanyard
2. Lock plate
1. Lanyard
2. Lock plate 
						

							 
Basic components 
18 
EMU31430 
Steering friction adjuster 
A friction device provides adjustable resis-
tance to the steering mechanism, and can be
set according to operator preference. An ad-
juster lever is located on the bottom of the
tiller handle bracket.
To increase resistance, turn the lever to the
port side “A”.
To decrease resistance, turn the lever to the
starboard side “B”.
WARNING
 
EWM00040  
Do not overtighten the friction adjuster. If
there is too much resistance, it could be
difficult to steer, which could result in an 
accident. 
If the resistance does not increase even
when the lever is turned to the port side “A”,
make sure that the nut is tightened to the
specified torque.
NOTE:
 
 
Check the tiller handle for smooth move-
ment when the lever is turned to the star-
board side “B”. 
 
Do not apply lubricants such as grease to
the friction areas of the steering friction ad- 
juster. 
EMU26141 
Power trim and tilt switch on remote 
control or tiller handle 
The power trim and tilt system adjusts the
outboard motor angle in relation to the tran-
som. Pressing the switch “ ” (up) trims the
outboard motor up, then tilts it up. Pressing
the switch “ ” (down) tilts the outboard mo-
tor down and trims it down. When the switch
is released, the outboard motor will stop in its
current position.
NOTE:
 
For instructions on using the power trim and 
tilt switch, see pages 45 and 47.
ZMU02810
B
A
 
1. Nut 
Nut tightening torque:
3.7 Nm (2.7 ft-lb) (0.4 kgf-m) 
						

							 
Basic components 
19 
EMU26151 
Power trim and tilt switch on bottom 
engine cowling 
The power trim and tilt switch is located on
the side of the bottom engine cowling. Press-
ing the switch “” (up) trims the outboard
motor up, then tilts it up. Pressing the switch
“” (down) tilts the outboard motor down
and trims it down. When the switch is re-
leased, the outboard motor will stop in its
current position.
WARNING
 
EWM01030  
Use the power trim and tilt switch located
on the bottom engine cowling only when
the boat is at a complete stop with the en-
gine off. Attempting to use this switch
while the boat is moving could increase
the risk of falling overboard and could
distract the operator, increasing the risk
of collision with another boat or an obsta- 
cle.
NOTE:
 
For instructions on using the power trim and 
tilt switch, see page 47. 
EMU30900 
Variable trolling RPM switches 
The trolling speed can be adjusted when the
outboard motor is trolling. Press the “”
switch to increase the trolling speed and
press the “” switch to decrease the trolling
speed.
NOTE:
 
 
The trolling speed changes approximately
50 r/min each time a switch is pressed. 
 
If the trolling speed has been adjusted, the
engine returns to the normal trolling speed
when the engine is stopped and restarted
or when the engine speed exceeds ap-
proximately 3000 r/min. 
 
For instructions on using the variable troll- 
ing RPM switches, see page 44.
UP
DOWN
ZMU03592 
						

							 
Basic components 
20 
EMU26241 
Trim tab with anode 
The trim tab should be adjusted so that the
steering control can be turned to either the
right or left by applying the same amount of
force.
WARNING
 
EWM00840  
An improperly adjusted trim tab could
cause difficult steering. Always test run
after the trim tab has been installed or re-
placed to be sure steering is correct. Be
sure you have tightened the bolt after ad- 
justing the trim tab. 
If the boat tends to veer the left (port side),
turn the trim tab rear end to the port side “A”
in the figure. If the boat tends to veer the right
(starboard side), turn the trim tab end to the
starboard side “B” in the figure.
CAUTION:
 
ECM00840  
The trim tab also serves as an anode to
protect the engine from electrochemical
corrosion. Never paint the trim tab as it 
will become ineffective as an anode. 
EMU26340 
Tilt support lever for power trim and 
tilt or hydro tilt model 
To keep the outboard motor in the tilted up
position, lock the tilt support lever to the
clamp bracket. 
1. Variable trolling RPM switch 
1. Trim tab
2. Bolt
3. Cap
1. Trim tab
2. Bolt
3. Cap
123
ZMU02525
A B
A
B
ZMU03097
1
2 
						

							 
Basic components 
21 
EMU26372 
Top cowling lock lever(s) (turn type) 
To remove the engine top cowling, turn the
lock lever(s) and lift off the cowling. When in-
stalling the cowling, check to be sure it fits
properly in the rubber seal. Then lock the
cowling again by returning the lever(s) to the
lock position. 
EMU26460 
Flushing device 
This device is used to clean the cooling wa-
ter passages of the motor using a garden
hose and tap water.
NOTE:
 
For details on usage, see page 56. 
EMU31702 
Water separator 
This engine has a combination fuel filter/wa-
ter separator and associated warning sys-
tem. If water separated from the fuel
exceeds a specific volume, the warning de-
vice will activate.
Activation of warning device 
 
The water separator warning indicator will
blink. 
 
The buzzer will sound intermittently only
when the gear shift is in neutral. 
 
If the warning system has activated, stop
the engine and consult a Yamaha dealer
immediately. 
EMU26470 
Tachometer 
This gauge shows the engine speed and has
the following functions. 
1. Top cowling lock lever(s)
ZMU03595
1
ZMU05093
 
1. Flushing device
1
ZMU05095
ZMU05474 
						

							 
Basic components 
22 
EMU26491 
Digital tachometer 
The tachometer shows the engine speed
and has the following functions.
NOTE:
 
All segments of the display will light momen-
tarily after the main switch is turned on and 
will return to normal thereafter.
NOTE:
 
The water separator and engine trouble
warning indicators only operate when the en-
gine is equipped with the appropriate func- 
tions. 
EMU26503 
Low oil pressure warning indicator 
If oil pressure drops too low, this indicator will
flash. For further information, see page 33.
CAUTION:
 
ECM00020  
 
Do not continue to run the engine if the
low oil pressure warning indicator is on
and the engine oil level is lower. Seri-
ous engine damage will occur. 
 
The low oil pressure warning indicator
does not indicate the engine oil level.
Use the oil dipstick to check the re-
maining oil quantity. For further infor- 
mation, see page 37. 
EMU26522 
Low oil pressure warning indicator 
If oil pressure drops too low, the warning in-
dicator will start to blink. For further informa-
tion, see page 33.
CAUTION:
 
ECM00020  
 
Do not continue to run the engine if the
low oil pressure warning indicator is on
and the engine oil level is lower. Seri- 
1. Tachometer
2. Warning indicator(s)
1. Tachometer
2. Trim meter
3. Hour meter
4. Low oil pressure warning indicator
5. Overheat warning indicator
6. Water separator warning indicator
7. Engine trouble warning indicator
8. Set button
9. Mode button
ZMU04578
1
2
1
52
4
3
76
89ZMU04185
ZMU04754 
						

							 
Basic components 
23 
ous engine damage will occur. 
 
The low oil pressure warning indicator
does not indicate the engine oil level.
Use the oil dipstick to check the re-
maining oil quantity. For further infor- 
mation, see page 37. 
EMU26572 
Overheat warning indicator 
If the engine temperature rises too high, this
indicator will flash. For further information on
reading the indicator, see page 33.
CAUTION:
 
ECM00050  
Do not continue to run the engine if the
overheat warning indicator is on. Serious 
engine damage will occur. 
EMU26581 
Overheat warning indicator (digital 
type) 
If the engine temperature rises too high, the
warning indicator will start to blink. For fur-
ther information on reading the indicator, see
page 33.
CAUTION:
 
ECM00050  
Do not continue to run the engine if the
overheat warning indicator is on. Serious 
engine damage will occur. 
EMU26600 
Speedometer (digital type) 
This gauge shows the boat speed. 
1. Low oil pressure warning indicator
ZMU017361
ZMU04715
 
1. Overheat warning indicator
1. Speedometer
2. Fuel gauge
3. Trip meter/clock/voltmeter
4. Warning indicator(s)
ZMU01737
1 
						

							 
Basic components 
24
NOTE:
 
After the main switch is first turned on, all
segments of the display come on as a test.
After a few seconds, the gauge will change
to normal operation. Watch the gauge when
turning on the main switch to make sure all 
segments come on.
NOTE:
 
The speedometer displays km/h, mph, or
knots, according to operator preference. Se-
lect the desired unit of measurement by set-
ting the selector switch on the back of the 
gauge. See the illustration for settings. 
EMU26610 
Trim meter 
This gauge shows the trim angle of your out-
board motor.
NOTE:
 
Memorize the trim angles that work best for
your boat under different conditions. Adjust
the trim angle to the desired setting with the 
power trim and tilt switch. 
EMU26620 
Trim meter (digital type) 
This meter shows the trim angle of your out-
board motor.
NOTE:
 
 
Memorize the trim angles that work best
for your boat under different conditions.
Adjust the trim angle to the desired using
the power trim and tilt switch. 
 
If the trim angle of your motor exceeds the
trim operating range, the top segment on 
the trim meter display will blink. 
EMU26650 
Hour meter (digital type) 
This meter shows the number of hours the 
1. Cap
2. Selector switch (for speed unit)
3. Selector switch (for fuel sensor)
ZMU04581
ZMU01740