Yamaha 115 C Service Manual

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3-16
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8Do not turn the main switch to
“START” when the engine is running.
8Do not keep the starter motor turning
for more than 5 seconds. The starter
can be damaged. The battery will also
run down quickly, making it harder to
start the engine. If the engine does
not start within 5 seconds, return the
main switch to “ON”, wait 10 sec-
onds, and then crank the engine
again.
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EMG00010
WARMING UP ENGINE
1) Before beginning operation, allow the
engine to warm up at idling speed for 3
minutes. (Failure to do this will shorten
engine life.)
2) Check for a steady flow of water from
the cooling-water pilot hole.
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A continuous flow of water from the pilot
hole shows that the water pump is
pumping water through the cooling pas-
sages. If water is not flowing out of the
pilot hole at all times while the engine is
running, do not continue to run the
engine. Overheating and...

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3-18
EMG20310
SHIFTING
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Before shifting, make sure there are no
swimmers or obstacles in the water near
you.
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To change the shifting position from for-
ward to reverse or vice-versa, close the
throttle first so that the engine idles (or
runs at low speeds).
FORWARD
Pull up the neutral interlock trigger (If
equipped) and move the remote control
lever quickly and firmly from Neutral to For-
ward.
REVERSE
Pull up the neutral interlock trigger (If
equipped) and move the remote control
lever quickly and...

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3-19
EMG38010
STOPPING ENGINE
Let it cool off for a few minutes at idle or
low speed first. Stopping the engine
immediately after operating at high speed
is not recommended.
EMG41511
1) Turn the main switch to “OFF”.
NOTE:
The engine can also be stopped by
pulling the lanyard from the engine stop
switch (then turning the main switch to
“OFF”).
2) Tighten the air vent screw on the fuel
tank cap after stopping the engine, if
it is equipped.
3) Remove the key if the boat will be left
unattended.
ON
START...

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3-20
EMU01412
TRIMMING OUTBOARD
MOTOR
The trim angle of the outboard motor
helps determine the position of the bow
of the boat in the water. The correct trim
angle will help improve performance and
fuel economy while reducing strain on the
engine. The 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.
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Excessive trim for the operating condi-
tions (either trim up or...

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3-21ADJUSTING TRIM ANGLE
EMU01401
Power Trim/Tilt Model
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8Be sure all people are clear of the out-
board motor when adjusting the
trim/tilt angle, also be careful not to
pinch any body parts between the drive
unit and clamp bracket.
8Use caution when trying a trim position
for the first time. Increase speed gradu-
ally and watch for any signs of instabili-
ty or control problems.
8Use the power trim/tilt switch located
on the bottom engine cowling (if
equipped) only when the boat is at a
complete stop...

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3-22
EMU19160
Trim angle settings and boat handling
When the boat is on plane, a bow-up atti-
tude results in less drag, greater stability
and efficiency. 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 tendency to steer to one
side or the other. Compensate for this as
you steer. The trim tab can also be adjust-
ed to help offset this effect.
1Optimum angle (level keel line)
2Bow up
3Bow down
Bow Up
Too much trim-out puts the bow...

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3-23
EMU01200
TILTING UP/DOWN
If the engine will be stopped for some
time, or if the boat is moored in shallows,
the engine should be tilted up to protect
the propeller and casing from damage by
collision with obstructions, and also to
reduce salt corrosion.
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Before tilting the motor, follow the proce-
dures under “STOPPING ENGINE”. Never
tilt the motor while the engine is running.
Severe damage from overheating can
result.
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Be sure all people are clear of the out-
board motor when adjusting the...

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3-24
EMU01201
PROCEDURE FOR TILTING UP
Power trim/tilt model
1) If there is a fuel joint or a fuel cock on
the boat, disconnect the fuel line or
close the fuel cock.
2) Push the power trim/tilt switch “UP”
until the outboard has tilted up com-
pletely.
302012
UP
DOWN
UP
DN
403033
3) Turn the tilt-support lever toward you
and support the engine.
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After tilting the engine, be sure to sup-
port it with the tilt-support lever. Other-
wise, the engine could fall back down
suddenly if oil in the power...

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3-25
4) Once the engine is supported with the
tilt-support lever, push the power
trim/tilt switch DOWN to retract the
trim rods.
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Be sure to retract the trim rods complete-
ly during mooring. This protects the rods
from marine growths and corrosion
which could damage the power trim/tilt
mechanism.
PROCEDURE FOR TILTING DOWN
Power trim and tilt 
1) Push the power trim and tilt switch
“UP” until the engine is supported by
the tilt rod. 
2) Release the tilt-support lever. 
3) Push the power trim and...