Yamaha 115 C Service Manual

							EMC00010
Chapter 2
BASIC COMPONENTS
MAIN COMPONENTS..............................2-1
OPERATIONS OF CONTROLS AND
OTHER FUNCTIONS................................2-3
Remote control .....................................2-3
Choke knob ...........................................2-8
Trim tab .................................................2-8
Power trim / tilt switch .........................2-9
Digital tachometer ..............................2-10
Digital speedometer ...........................2-13
Fuel management meter ...................2-16
Tilt support lever ................................2-20
Top cowling lock levers .....................2-20
Top cowling release lever .................2-20
Flushing device...................................2-21
WARNING SYSTEM..............................2-22
Overheat warning...............................2-22
Oil level warning/Oil filter clogging 
warning ...............................................2-23
1
2
3
4
5
6
E
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							2-1
E
EMU01206
MAIN COMPONENTS
q
e
r
t
y ui o !1!2 !3
TRIP TRIPTIME
TIMEBATT
BATT
Km/h
Km/h
knot
mph
km
mileSPEED SPEEDYAMAHA
set
set
mode mode
!5
!8
!0
w
!1!4
!6
!7
1Power trim and tilt switch
*2Flushing device
3Tilt support lever
4Anti-cavitation plate
5Trim tab (Anode)
*6Propeller
7Cooling water inlet
8Anode
9Clamp bracket
0Power trim and tilt unit
qCowling release lever*1/
Cowling lock lever*2
wChoke knob
eTop cowlingrCooling water pilot hole
*tRemote control box (Side mount type)
*yDigital tachometer
*uDigital speedmeter
*iRemote oil tank
*1. V4
*2. V6
* May not be exactly as shown; also may not
be included as standard equipment on all
models.
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							2-2
E
EMU01206
MAIN COMPONENTS
TRIP TRIPTIME
TIMEBATT
BATT
Km/h
Km/h
knot knot
mph
km
mileSPEED SPEEDYAMAHA
set
set
mode mode
!5
!6
!8!7
q
w
e
r
t
y u io !0 !1!2
!3
!4!1
V150
1Power trim and tilt switch
2Flushing device
3Tilt support lever
4Anti-cavitation plate
5Trim tab (Anode)
*6Propeller
7Cooling water inlet
8Anode
9Clamp bracket0Power trim and tilt unit
qCowling lock lever
wChoke knob
eTop cowling
rCooling water pilot hole
*tRemote control box (Side mount type)
*yDigital tachometer
*uDigital speedmeter
*iRemote oil tank
* May not be exactly as shown; also may not
be included as standard equipment on all
models.
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							2-3
E
000200
wq
e
r
t y
u
EMC20010
OPERATIONS OF CONTROLS
AND 
OTHER FUNCTIONS
EMU00096
REMOTE CONTROL
Both the shifter and the throttle are actu-
ated by the remote control lever. In addi-
tion, this control also has the electrical
switches.
1Remote control lever
2Neutral interlock trigger
3Neutral throttle lever
4Main switch
5Engine stop lanyard switch
6Power trim/tilt switch
7Throttle friction adjusting screw
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							2-4
E
R N
F
q
we
r
ty
uu tr
y
701031
701034**
UPDN
N
701033*
q
w
EMC50010*
Remote control lever
Moving the lever forward from the Neu-
tral position engages Forward gear.
Pulling the lever back from Neutral
engages Reverse. The engine will contin-
ue to run at idle until the lever is moved
about 35° (a detent can be felt). Moving
the lever farther opens the throttle, and
the engine will begin to accelerate.
1Neutral
2Forward
3Reverse
4Shift
5Fully closed
6Throttle
7Fully open
EMC50110
Neutral interlock trigger
To shift out of Neutral, the neutral inter-
lock trigger of the remote control lever
must first be pulled up.
EMC50210
Neutral throttle lever
To open the throttle without shifting into
either Forward or Reverse, place the
remote control lever in the Neutral posi-
tion and lift the neutral throttle lever.
NOTE:
The neutral throttle lever will operate only
when the remote control lever is in Neu-
tral. The remote control lever will operate
only when the neutral throttle lever is in
the closed position.
1Fully open
2Fully closed
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							2-5
E
ON
START OFF
701021
701055
EMC48110
Main switch
The main switch controls the ignition sys-
tem; its operation is described below.
8OFF
Electrical circuits switched off.
(The key can be removed.)
8ON
Electrical circuits switched on.
(The key cannot be removed.)
8START
Starter-motor will turn and start engine.
(When the key is released, it returns auto-
matically to “ON”.)
EMC50310
Choke switch
While the main switch is being pressed in
at “ON” or “START”, the choke system
will switch on, to supply a rich mixture
required to start the engine. (When the
key is released, it will switch off automati-
cally.)
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							2-6
E
000569
q
w
EMC28210
Engine stop lanyard switch
The lock-plate on the end of the lanyard
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 ignition to the
engine. This will prevent the boat from
running away under power.
w
8Attach the engine stop switch lanyard
to a secure place on your clothing, your
arm or leg while operating.
8Do not attach the lanyard to clothing
that could tear loose. Do not route the
lanyard in such a way that it could
become entangled, preventing it from
functioning.
8Avoid 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.
NOTE:
The engine cannot be started with the
lock-plate removed. 
1Lock-plate
2Lanyard
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							2-7
E
UP
DN
701034**
UPDN
EMU01331
Power Trim/Tilt Switch
The power trim/tilt adjusts the motor
angle in relation to the transom. The
power trim/tilt switch is located on the
remote control lever grip. Pushing the
switch “UP” trims the motor up, then tilts
the motor up. Pressing the switch “DN”
tilts the motor down and trims the motor
down. When the switch button is
released, the motor will stop in its current
position.
NOTE:
Refer to the sections “ADJUSTING TRIM
ANGLE” and “TILTING UP/DOWN” in
Chapter 3 for instructions on usage.
701035
EMU01155
Throttle Friction Adjusting Screw
A friction device in the remote control box
provides adjustable resistance to move-
ment of the remote control lever, and can
be set according to operator preference.
An adjusting screw is located on the front
of the remote control box.
w
Do not overtighten the friction adjusting
screw. If there is too much resistance, it
may be difficult to move the lever, which
could result in an accident.
Resistance Screw
Increase Turn clockwise
Decrease Turn counterclockwise
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							E
q w e
603014
A
B
603012
EMD04011*
TRIM TAB
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.
w
An improperly adjusted trim tab may
cause difficult steering. Always test run
after the trim tab has been installed or
replaced to be sure steering is correct. Be
sure you have tightened the bolt after
adjusting the trim tab.
1Trim tab
2Bolt
3Cap
cC
The trim tab also serves as an anode to
protect the engine from electroche mical
corrosion. 
Never paint the trim tab as it will become
ineffective as an anode.
Boat tends to veer
To the left
(port side)
To the right
(starboard side)
The rear end of trim tab
Turn the left(port side),
“A” in the figure
Turn the right
(starboard side), 
“B” in the figure
2-8
EMC42010
CHOKE KNOB
Pulling out this knob (setting it to ON) sup-
plies a rich mixture required to start the
engine.
NOTE:
The choke knob for remote control model
has the same function as the choke switch
on the remote control box.
305033*
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							E
2-9
302012
UP
DOWN
EMU01125
POWER TRIM/TILT SWITCH
The power trim/tilt adjusts the motor
angle in relation to the transom. The
power trim/tilt switch is located on the
side of the bottom engine cowling. Push-
ing the switch “UP” trims the motor up,
then tilts the motor up. Pressing the
switch “DN” tilts the motor down and
trims the motor down. When the switch
button is released, the motor will stop in
its current position.
w
Use the power trim/tilt switch located on
the bottom engine cowling only when
the boat is at a complete stop with the
engine off. Attempting to use the cowl-
ing-mounted power trim/tilt switch while
the boat is moving could increase the risk
of falling overboard and could distract
the operator, increasing the risk of colli-
sion with another boat or an obstacle.
NOTE:
Refer to the section “Adjusting Trim
Angle” and “Tilting Up/Down” for instruc-
tions on usage.
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