Yamaha F 25 Manual

General information
6
“The general prudential rule”
This rule is called Rule 2 in the International
Rules and says,
“In obeying and construing these rules due re-
gard shall be had to all dangers of navigation
and collision, and to any special circumstanc-
es, which may render a departure from the
above rules necessary in order to avoid im-
mediate danger.”
In other words, follow the standard rules ex-
cept when a collision will occur unless both
vessels try to avoid each other. If that is the
case, both...

General information
7
Overtaking
If you are passing another vessel, you are the
“Give-Way” vessel. This means that the other
vessel is expected to maintain its course and
speed. You must stay out of its way until you
are clear of it. Likewise, if another vessel is
passing you, you should maintain your speed
and direction so that the other vessel can
steer itself around you.
EMU25530Other special situations
There are three other rules you should be
aware of when driving your boat around other
vessels....

General information
8
System has been devised for these waters.
This system uses buoys and signs with dis-
tinctive shapes and colors to show regulatory
or advisory information. These markers are
white with black letters and orange boarders.
They signify speed zones, restricted areas,
danger areas, and general information.Remember, markings may vary by geograph-
ic location. Always consult local boating au-
thorities before driving your boat in unfamiliar
waters.
ZMU01708
U69M15E0.book  Page 8...

General information
9
EMU31490
Fueling instructions
WARNING
EWM01490
GASOLINE AND ITS VAPORS ARE HIGH-
LY FLAMMABLE AND EXPLOSIVE!

Do not smoke when refueling, and keep
away from sparks, flames, or other
sources of ignition.

Stop engine before refueling.

Refuel in a well-ventilated area.

Take care not to spill gasoline. If gaso-
line spills, wipe it up immediately with
dry rags.

Do not overfill the fuel tank.

Tighten the filler cap securely after refu-
eling.

If you should swallow some gasoline,...

General information
10
CAUTION:
ECM01050
All 4-stroke engines are shipped from the
factory without engine oil.
EMU25742
Propeller selection
The performance of your outboard motor will
be critically affected by your choice of propel-
ler, as an incorrect choice could adversely af-
fect performance and could also seriously
damage the motor. Engine speed depends on
the propeller size and boat load. If engine
speed is too high or too low for good engine
performance, this will have an adverse effect
on the...

Basic components
11
EMU25797
Main components
NOTE:
* May not be exactly as shown; also may not be included as standard equipment on all models.
EMU25821Fuel tank
If your model included a fuel tank, its parts
and functions are as follows.
1. Top cowling
2. Top cowling lock lever
3. Carrying handle
4. Steering friction screw
5. Anti-cavitation plate
6. Propeller
7. Cooling water inlet
8. Trim rod
9. Clamp bracket
10.Tiller handle
11.Air vent screw
12.Fuel tank cap
13.Manual starter handle
14.Engine stop...

Basic components
12
EMU25850Fuel tank cap
This cap seals the fuel tank. When removed,
the tank can be filled with fuel. To remove the
cap, turn it counterclockwise.
EMU25860Air vent screw
This screw is on the fuel tank cap. To loosen
the screw, turn it counterclockwise.
EMU25872Fuel cock
The fuel cock turns on and off the supply of
fuel from the fuel tank to the engine.
EMU25881Close
To stop fuel flow to the engine, turn the lever
or knob to close position.
Always turn the lever or knob to close...

Basic components
13
EMU25930Gear shift lever
Pulling the gear shift lever towards you puts
the engine in forward gear so that the boat
moves ahead.
EMU25941Throttle grip
The throttle grip is on the tiller handle. Turn
the grip counterclockwise to increase speed
and clockwise to decrease speed.
EMU25961Throttle indicator
The fuel consumption curve on the throttle in-
dicator shows the relative amount of fuel con-
sumed for each throttle position. Choose the
setting that offers the best performance and...

Basic components
14
EMU25990Engine stop lanyard switch
The lock plate must be attached to the engine
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 ig-
nition to the engine. This will prevent the boat
from running away under power.
WARNING
EWM00120

Attach the engine stop switch lanyard to
a secure place on your clothing,...

Basic components
15
EMU26122Steering friction adjuster
A friction device provides adjustable resis-
tance to the steering mechanism, and can be
set according to operator preference. An ad-
justing screw or bolt is located on the swivel
bracket.
To increase resistance, turn the adjuster
clockwise.
To decrease resistance, turn the adjuster
counterclockwise.
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...