Yamaha F 25 Manual

Basic components
16
EMU26450Carrying handle
A carrying handle is provided on the rear of
the outboard motor. It enables you to carry the
outboard motor easily with one hand.
U69M15E0.book  Page 16  Wednesday, April 5, 2006  4:48 PM 

Operation
17
EMU26901
Installation
CAUTION:
ECM00110
Incorrect engine height or obstructions to
smooth water flow (such as the design or
condition of the boat, or accessories such
as transom ladders or depth finder trans-
ducers) can create airborne water spray
while the boat is cruising. Severe engine
damage may result if the motor is operat-
ed continuously in the presence of air-
borne water spray.
NOTE:
During water testing check the buoyancy of
the boat, at rest, with its maximum load.
Check that...

Operation
18
tends to occur, thus reducing the propulsion;
and if the propeller tips cut the air, the engine
speed will rise abnormally and cause the en-
gine to overheat. If the mounting height is too
low, the water resistance will increase and
thereby reduce engine efficiency. Mount the
outboard motor so that the anti-cavitation
plate is between the bottom of the boat and a
level 25 mm (1 in.) below it.
NOTE:

The optimum mounting height of the out-
board motor is affected by the boat and mo-
tor...

Operation
19
WARNING
EWM00650
Avoid using bolts, nuts or washers other
than those contained in the engine pack-
aging. If used, they must be of at least the
same quality of material and strength and
must be tightened securely. After tighten-
ing, test run the engine and check their
tightness.
EMU30173
Breaking in engine
Your new engine requires a period of break-in
to allow mating surfaces of moving parts to
wear in evenly. Correct break-in will help en-
sure proper performance and longer engine
life....

Operation
20
with oil if it is below the lower mark, or
drain to the specified level if it is above
the upper mark.
EMU30850
Filling fuel for built-in tank
WARNING
EWM00060
Gasoline and its vapors are highly flam-
mable and explosive. Keep away from
sparks, cigarettes, flames, or other sourc-
es of ignition.
1. With the outboard motor tilted down (in
the vertical running position), remove the
fuel tank cap.
2. Use a funnel if the nozzle on the fuel can
or pump is not small enough or long
enough to fit...

Operation
21
EMU27450
Operating engineEMU31510Feeding fuel
WARNING
EWM00420

Before starting the engine, make sure
that the boat is tightly moored and that
you can steer clear of any obstructions.
Be sure there are no swimmers in the
water near you.

When the air vent screw is loosened,
gasoline vapor will be released. Gaso-
line is highly flammable, and its vapors
are flammable and explosive. Refrain
from smoking, and keep away from
open flames and sparks while loosening
the air vent screw.

This...

Operation
22

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 engine
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.
3. Place the throttle grip in the “”
(start) position.
4. Place the choke knob in the...

Operation
23

If the engine does not start on the first try,
repeat the procedure. If the engine fails to
start after 4 or 5 tries, open the throttle a
small amount (between 1/8 and 1/4) and try
again. Also if the engine is warm and fails to
start, open the throttle a same amount and
try to start the engine again. If the engine
still fails to start, see page 45.
EMU27670
Warming up engineEMU27732Manual start models
1. After starting the engine, return the choke
knob to the halfway position. For approx-...

Operation
24
2. Move the gear shift lever quickly and firm-
ly from neutral to forward.
Remote control models
Pull up the neutral interlock trigger (if
equipped) and move the remote control lever
quickly and firmly from neutral to forward.
EMU27811Reverse
WARNING
EWM00190
When operating in reverse, go slowly. Do
not open the throttle more than half. Other-
wise the boat could become unstable,
which could result in loss of control and
an accident.
1. Place the throttle grip in the fully closed
position.2....

Operation
25
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.
EMU31520Procedure
1. Push and hold the engine stop button un-
til the engine comes to a complete stop.
2. After stopping the engine, tighten the air
vent screw on the fuel tank cap and set
the fuel cock to the closed position.
NOTE:
The engine can also be stopped by pulling the
lanyard and...