Page 26 of 98

INSTRUMENT AND CONTROL FUNCTIONS
3-10
1
2
3
4
5
6
7
8
9Right
EAU12360
Pass switch “PASS”
Press this switch to flash the headlight.
EAU12400
Dimmer switch “/”
Set this switch to “” for the high
beam and to “” for the low beam.
EAU12460
Turn signal switch “/”
To signal a right-hand turn, push this
switch to “”. To signal a left-hand
turn, push this switch to “”. When re-leased, the switch returns to the center
position. To cancel the turn signal
lights, push the switch in after it has re-
turned to the center position.
EAU12500
Horn switch “”
Press this switch to sound the horn.
EAU12660
Engine stop switch “/”
Set this switch to “” before starting
the engine. Set this switch to “” to
stop the engine in case of an emergen-
cy, such as when the vehicle overturns
or when the throttle cable is stuck.
EAU12720
Start switch “”
With the sidestand up, push this switch
while applying the front or rear brake to
crank the engine with the starter.
CAUTION:
ECA10050
See page 5-1 for starting instruc-
tions prior to starting the engine.
EAU42810
(for ABS models)
The engine trouble warning light and
ABS warning light will come on when
the key is turned to “ON” and the start
switch is pushed, but this does not indi-
cate a malfunction.
EAU12733
Hazard switch “”
With the key in the “ON” or “” posi-
tion, use this switch to turn on the haz-
ard lights (simultaneous flashing of all
turn signal lights).
The hazard lights are used in case of
an emergency or to warn other drivers
when your vehicle is stopped where it
might be a traffic hazard.
CAUTION:
ECA10061
Do not use the hazard lights for an
extended length of time with the en-
gine not running, otherwise the bat-
tery may discharge.
1. Engine stop switch “/”
2. Hazard switch “”
3. Start switch “”
1
2
3
Page 28 of 98

INSTRUMENT AND CONTROL FUNCTIONS
3-12
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9
rear brake lock lever is applied.
To provide secure locking of the
rear wheel, apply the rear brake le-
ver first before moving the rear
brake lock lever to the left.
WARNING
EWA12361
Never move the rear brake lock lever
to the left while the vehicle is mov-
ing, otherwise loss of control or an
accident may result. Make sure that
the vehicle is stopped before mov-
ing the rear brake lock lever to the
left.
EAU12991
ABS (for ABS models)
The Yamaha ABS (Anti-lock Brake
System) features a dual electronic con-
trol system, which acts on the front and
rear brakes independently. The ABS
securely controls wheel lockup during
emergency braking on changing road
surfaces and under various weather
conditions, thereby maximizing tire ad-
hesion and performance while provid-
ing a smooth braking action. The ABS
is monitored by an ECU (Electronic
Control Unit), which will have recourse
to manual braking if a malfunction oc-
curs.
WARNING
EWA10090
The ABS performs best on long
braking distances.
On certain (rough or gravel)
roads, the braking distance may
be longer with than without the
ABS. Therefore, always keep a
sufficient distance to the vehi-
cle ahead to match the riding
speed.
NOTE:
When the ABS is activated, the
brakes are operated in the usual
way. A pulsating action may be felt
at the brake levers, but this does
not indicate a malfunction.
This ABS has a test mode which
allows the owner to experience the
pulsating at the brake levers when
the ABS is operating. However,
special tools are required, so
please consult your Yamaha deal-
er when performing this test.
Page 29 of 98
INSTRUMENT AND CONTROL FUNCTIONS
3-13
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7
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9
EAU13162
Fuel tank cap
To open the fuel tank cap
1. Open the lid by sliding the lever
forward, and then pull the lever up.
2. Insert the key into the lock and turn
it clockwise. The lock will be re-
leased and the fuel tank cap can
be removed.
To install the fuel tank cap
1. Align the match marks, insert the
fuel tank cap into the tank opening,
and then push down on the cap.
2. Turn the key counterclockwise to
the original position, and then re-move it.
3. Close the lid.
WARNING
EWA11120
Be sure that the fuel tank cap is
properly installed and locked before
riding the scooter.
1. Lid
2. Opening lever
2 1
1. Fuel tank cap
1. Match marks
1
1
Page 30 of 98

INSTRUMENT AND CONTROL FUNCTIONS
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EAU13211
Fuel
Make sure that there is sufficient fuel in
the tank. Fill the fuel tank to the bottom
of the filler tube as shown.
WARNING
EWA10880
Do not overfill the fuel tank, oth-
erwise it may overflow when the
fuel warms up and expands.
Avoid spilling fuel on the hot en-
gine.
CAUTION:
ECA10070
Immediately wipe off spilled fuel
with a clean, dry, soft cloth, sincefuel may deteriorate painted surfac-
es or plastic parts.
EAU33520
CAUTION:
ECA11400
Use only unleaded gasoline. The use
of leaded gasoline will cause severe
damage to internal engine parts,
such as the valves and piston rings,
as well as to the exhaust system.
Your Yamaha engine has been de-
signed to use regular unleaded gaso-
line with a research octane number of
91 or higher. If knocking (or pinging) oc-
curs, use a gasoline of a different brand
or premium unleaded fuel. Use of un-
leaded fuel will extend spark plug life
and reduce maintenance costs.
EAU13442
Catalytic converters
This vehicle is equipped with catalytic
converters in the exhaust system.
WARNING
EWA10860
The exhaust system is hot after op-
eration. Make sure that the exhaust
system has cooled down before do-
ing any maintenance work.
CAUTION:
ECA10700
The following precautions must be
observed to prevent a fire hazard or
other damages.
Use only unleaded gasoline.
The use of leaded gasoline will
cause unrepairable damage to
the catalytic converter.
Never park the vehicle near pos-
sible fire hazards such as grass
or other materials that easily
burn.
Do not allow the engine to idle
too long.
1. Fuel tank filler tube
2. Fuel level
21
Recommended fuel:
REGULAR UNLEADED GASOLINE
ONLY
Fuel tank capacity:
14.0 L (3.70 US gal) (3.08 Imp.gal)
Page 33 of 98
INSTRUMENT AND CONTROL FUNCTIONS
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EAU14492
Storage compartments
Front storage compartment A
To open the storage compartment
when it is locked, insert the key in the
lock, turn it counterclockwise, and then
grasp the lock while pushing the button
in.
To open the storage compartment
when it is unlocked, simply grasp the
lock while pushing the button in.
To lock the storage compartment, push
the lid into the original position, insert
the key in the lock, turn it clockwise,and then remove it.
Front storage compartment B
To open the storage compartment,
slide the lever up, and then pull on the
lever.To close the storage compartment,
push the lid into the original position.
WARNING
EWA11160
Do not store heavy items in this
compartment.
Rear storage compartment
Two helmets can be stored in the stor-
age compartment under the seats.
(See page 3-15.)
1. Open.
2. Button
3. Lid
23
1
1. Lock.
2. Lid
2
1
1. Storage compartment opening lever
2. Lid
2
1
Page 34 of 98

INSTRUMENT AND CONTROL FUNCTIONS
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CAUTION:
ECA10080
Keep the following points in mind
when using the storage compart-
ment.
Since the storage compartment
accumulates heat when ex-
posed to the sun, do not store
anything susceptible to heat in-
side it.
To avoid humidity from spread-
ing through the storage com-
partment, wrap wet articles in a
plastic bag before storing them
in the compartment.
Since the storage compartment
may get wet while the scooter isbeing washed, wrap any articles
stored in the compartment in a
plastic bag.
Do not keep anything valuable
or breakable in the storage com-
partment.
CAUTION:
ECA11100
Do not leave the rider seat open for
an extended period of time, other-
wise the light may cause the battery
to discharge.
WARNING
EWA11170
Do not exceed the following loading
limits:
Front storage compartment A:
2 kg (4 lb)
Rear storage compartment: 5 kg
(11 lb)
Maximum load for the vehicle:
YP400 189 kg (417 lb)/YP400A
185 kg (408 lb)
EAU14890
Adjusting the shock absorber
assemblies
Each shock absorber assembly is
equipped with a spring preload adjust-
ing ring.
CAUTION:
ECA10100
Never attempt to turn an adjusting
mechanism beyond the maximum or
minimum settings.
WARNING
EWA10210
Always adjust both shock absorber
assemblies equally, otherwise poor
1. Rider seat
1
1. Spring preload adjusting ring
2. Position indicator
3. Spring preload adjusting tool
1
3
2
(b)(a)
12 3 4
5
Page 35 of 98

INSTRUMENT AND CONTROL FUNCTIONS
3-19
2
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9 handling and loss of stability may
result.
Adjust the spring preload as follows.
To increase the spring preload and
thereby harden the suspension, turn
the adjusting ring on each shock ab-
sorber assembly in direction (a). To de-
crease the spring preload and thereby
soften the suspension, turn the adjust-
ing ring on each shock absorber as-
sembly in direction (b).
NOTE:
Align the appropriate notch in the
adjusting ring with the position in-
dicator on the shock absorber.
Use the spring preload adjusting
tool included in the owner’s tool kit
to make this adjustment.
EAU15301
Sidestand
The sidestand is located on the left side
of the frame. Raise the sidestand or
lower it with your foot while holding the
vehicle upright.
NOTE:
The built-in sidestand switch is part of
the ignition circuit cut-off system, which
cuts the ignition in certain situations.
(See further down for an explanation of
the ignition circuit cut-off system.)
WARNING
EWA10240
The vehicle must not be ridden with
the sidestand down, or if the side-
stand cannot be properly moved up
(or does not stay up), otherwise the
sidestand could contact the ground
and distract the operator, resulting
in a possible loss of control.
Yamaha’s ignition circuit cut-off
system has been designed to assist
the operator in fulfilling the respon-
sibility of raising the sidestand be-
fore starting off. Therefore, check
this system regularly as described
below and have a Yamaha dealer re-pair it if it does not function proper-
ly.
Spring preload setting:
Minimum (soft):
1
Standard:
2
Maximum (hard):
5
Page 36 of 98
INSTRUMENT AND CONTROL FUNCTIONS
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EAU45050
Ignition circuit cut-off system
The ignition circuit cut-off system (com-
prising the sidestand switch and brake
light switches) has the following func-
tions.
It prevents starting when the side-
stand is up, but neither brake is ap-
plied.
It prevents starting when either
brake is applied, but the sidestand
is still down.
It cuts the running engine when the
sidestand is moved down.
Periodically check the operation of the
ignition circuit cut-off system according
to the following procedure.
WARNING
EWA10250
If a malfunction is noted, have a
Yamaha dealer check the system be-
fore riding.