Yamaha F15 Owners Manual

 
25 
Operation 
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
transducers) can create airborne water
spray while the boat is cruising. Severe
engine damage may result if the motor is
operated continuously in the presence of 
airborne water spray.
NOTE:
 
During water testing check the buoyancy of
the boat, at rest, with its maximum load.
Check...

 
Operation 
26 
motor greatly affects the water resistance. If
the mounting height is too high, cavitation
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....

 
Operation 
27 
board (if packed). For details, consult
your Yamaha dealer.
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. 
EMU30172 
Breaking in engine 
Your new engine requires a period of break-
in to allow mating surfaces of moving parts to
wear in evenly. Correct...

 
Operation 
28 
er operation before starting the engine. 
 
The controls should work smoothly, with-
out binding or unusual free play. 
 
Look for loose or damaged connections. 
 
Check operation of the starter and stop
switches when the outboard motor is in the
water. 
EMU27140 
Engine 
 
Check the engine and engine mounting. 
 
Look for loose or damaged fasteners. 
 
Check the propeller for damage. 
EMU27163 
Checking the engine oil level 
1. Put the outboard motor in an upright po-
sition (not...

 
Operation 
29 
EMU27450 
Operating engine 
EMU27461 
Feeding fuel (portable tank)
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 loosen-...

 
Operation 
30 
EMU27490 
Starting engine 
EMU27505 
Manual start models (tiller control) 
1. Place the gear shift lever in neutral.
NOTE:
 
The start-in-gear protection device prevents
the engine from starting except when in neu- 
tral.
2. Attach the engine stop switch lanyard to
a secure place on your clothing, or your
arm or leg. Then install the lock plate on
the other end of the lanyard into the en-
gine stop switch.
WARNING
 
EWM00120  
 
Attach the engine stop switch lanyard
to a secure place on...

 
Operation 
31
NOTE:
 
 
It is not necessary to use the choke when
starting a warm engine. 
 
If the choke knob is left in the “”
(start) position while the engine is running, 
the engine will run poorly or stall.
5. Pull the manual starter handle slowly un-
til you feel resistance. Then give a
strong pull straight out to crank and start
the engine. Repeat if necessary.
6. After the engine starts, slowly return the
manual starter handle to its original po-
sition before releasing it.
7. Slowly return...

 
Operation 
32
NOTE:
 
The start-in-gear protection device prevents
the engine from starting except when in neu- 
tral.
2. Attach the engine stop switch lanyard to
a secure place on your clothing, or your
arm or leg. Then install the lock plate on
the other end of the lanyard into the en-
gine stop switch.
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....

 
Operation 
33 
 
If the choke knob is left in the “”
(start) position while the engine is running, 
the engine will run poorly or stall.
5. Push the starter button to start the mo-
tor. (Repeat if necessary.)
6. Immediately after the engine starts, re-
lease the starter button to allow it to re-
turn to its original position.
7. Slowly return the throttle grip to the fully
closed position so that the engine does
not stall.
CAUTION:
 
ECM00160  
 
Never push the starter button while the
engine is...

 
Operation 
34 
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. 
3. Turn the main switch to “” (on).
4. Open the throttle slightly without shifting
using the neutral throttle lever or free ac-
celerator. You may need to change the
throttle opening slightly depending on
engine temperature. After the engine
starts, return the throttle to the original
position.
NOTE:
 
 
On...