TABLE OF CONTENTS
SAFETY INFORMATION
...................1-1
Further safe-riding points .................1-4
DESCRIPTION
...................................2-1
Left view ...........................................2-1
Right view .........................................2-2
Controls and instruments..................2-3
INSTRUMENT AND CONTROL
FUNCTIONS
........................................3-1
Immobilizer system ..........................3-1
Main switch/steering lock .................3-2
Indicator and warning lights .............3-3
Speedometer ...................................3-5
Tachometer .....................................3-5
Multi-function display .......................3-5
Anti-theft alarm (optional) ................3-9
Handlebar switches .........................3-9
Front brake lever ...........................3-11
Rear brake lever ............................3-11
Rear brake lock lever .....................3-11
ABS (for ABS models) ...................3-12
Fuel tank cap .................................3-13
Fuel ................................................3-14
Catalytic converters .......................3-14
Seats .............................................3-15
Adjusting the rider seat ..................3-16
Storage compartments ..................3-17
Adjusting the shock absorber
assemblies .................................3-18
Sidestand .......................................3-19Ignition circuit cut-off system ......... 3-20
PRE-OPERATION CHECKS
.............. 4-1
Pre-operation check list ................... 4-2
OPERATION AND IMPORTANT RIDING
POINTS
............................................... 5-1
Starting the engine .......................... 5-1
Starting off ....................................... 5-2
Acceleration and deceleration ......... 5-2
Braking ............................................ 5-2
Tips for reducing fuel
consumption ................................ 5-3
Engine break-in ............................... 5-4
Parking ............................................ 5-4
PERIODIC MAINTENANCE AND MINOR
REPAIR
............................................... 6-1
Owner’s tool kit ................................ 6-1
Periodic maintenance and lubrication
chart ............................................. 6-3
Removing and installing cowlings and
panels .......................................... 6-7
Checking the spark plug ................ 6-11
Engine oil and oil filter element ..... 6-13
Final transmission oil ..................... 6-16
Coolant .......................................... 6-17
Air filter elements and check hoses and
V-belt case air filter element ...... 6-19
Checking the throttle cable free
play ............................................ 6-22Valve clearance ............................ 6-22
Tires .............................................. 6-22
Cast wheels .................................. 6-24
Front and rear brake lever free
play ............................................ 6-25
Adjusting the rear brake lock lever
cable .......................................... 6-26
Checking the front and rear brake
pads ........................................... 6-26
Checking the brake fluid level ....... 6-27
Changing the brake fluid ............... 6-28
Checking and lubricating the
cables ........................................ 6-28
Checking and lubricating the throttle
grip and cable ............................ 6-29
Lubricating the front and rear brake
levers ......................................... 6-29
Checking and lubricating the
centerstand and sidestand ........ 6-29
Checking the front fork .................. 6-30
Checking the steering ................... 6-31
Checking the wheel bearings ........ 6-31
Battery ........................................... 6-32
Replacing the fuses ...................... 6-33
Replacing a headlight bulb ........... 6-35
Tail/brake light ............................... 6-36
Replacing a front turn signal light
bulb ............................................ 6-36
Replacing a rear turn signal light
bulb ............................................ 6-37
2-1
1
2
3
4
5
6
7
8
9
DESCRIPTION
EAU10410
Left view
10 1
2
3
5
67
8
4
11
9
1. Headlight (page 6-35)
2. Fuel tank cap (page 3-13)
3. Rear storage compartment (page 3-17)
4. V-belt case air filter element (page 6-19)
5. Owner’s tool kit (page 6-1)
6. Fuses (page 6-33)
7. Battery (page 6-32)
8. Shock absorber assembly spring preload adjusting ring (page 3-18)9. Air filter element (left) (page 6-19)
10. Engine oil filter element (page 6-13)
11. Sidestand (page 3-19, 6-29)
DESCRIPTION
2-2
2
3
4
5
6
7
8
9
EAU10420
Right view
5 123
4
7
6
8
1. Grab bar (page 5-2)
2. Passenger seat (page 3-15)
3. Rider seat (page 3-15)
4. Coolant reservoir (page 6-17)
5. Radiator
6. Centerstand (page 6-29)
7. Air filter element (right) (page 6-19)
8. Shock absorber assembly spring preload adjusting ring (page 3-18)
INSTRUMENT AND CONTROL FUNCTIONS
3-3
2
34
5
6
7
8
9
To unlock the steering
Push the key in, and then turn it to
“OFF” while still pushing it.
WARNING
EWA10060
Never turn the key to “OFF” or
“LOCK” while the vehicle is moving,
otherwise the electrical systems will
be switched off, which may result in
loss of control or an accident. Make
sure that the vehicle is stopped be-
fore turning the key to “OFF” or
“LOCK”.
EAU10941
(Parking)
The steering is locked, and the taillight,
license plate light and auxiliary lights
are on. The hazard lights and turn sig-
nal lights can be turned on, but all other
electrical systems are off. The key can
be removed.
The steering must be locked before the
key can be turned to “ ”.
CAUTION:
ECA11020
Do not use the parking position for
an extended length of time, other-
wise the battery may discharge.
EAU11003
Indicator and warning lights
EAU11030
Turn signal indicator lights “” and
“”
The corresponding indicator light flash-
es when the turn signal switch is
pushed to the left or right.
EAU11080
High beam indicator light “”
This indicator light comes on when the
1. Turn signal indicator lights “ ” and “ ”
2. High beam indicator light “ ”
3. Immobilizer system indicator light
4. Engine trouble warning light “ ”
5. Anti-lock Brake System (ABS) warning
light “ ” (for ABS models)
123
4
5
ABS
INSTRUMENT AND CONTROL FUNCTIONS
3-4
1
2
3
4
5
6
7
8
9
high beam of the headlight is switched
on.
EAU11480
Engine trouble warning light “”
This warning light comes on when an
electrical circuit monitoring the engine
is defective. When this occurs, have a
Yamaha dealer check the self-diagno-
sis system.
The electrical circuit of the warning light
can be checked by turning the key to
“ON”. If the warning light does not come
on for a few seconds, then go off, have
a Yamaha dealer check the electrical
circuit.
EAU11551
ABS warning light “” (for ABS
models)
CAUTION:
ECA10830
If the ABS warning light comes on or
flashes while riding, the ABS may be
defective. If this occurs, have a
Yamaha dealer check the electrical
circuit.
See page 3-12 for an explanation of the
ABS.The electrical circuit of the warning light
can be checked by setting the engine
stop switch to “” and turning the key
to “ON”. The warning light should come
on for a few seconds, and then go off. If
the warning light does not come on or
remains on, have a Yamaha dealer
check the electrical circuit.
WARNING
EWA11350
When the ABS warning light comes
on or flashes while riding, the brake
system reverts to conventional brak-
ing. Therefore, be careful not to
cause the wheel to lock during emer-
gency braking.
NOTE:
The ABS warning light may come on
while pushing the start switch and while
accelerating the engine with the scoot-
er on its centerstand, but this does not
indicate a malfunction.
EAU38620
Immobilizer system indicator light
The electrical circuit of the indicator
light can be checked by turning the keyto “ON”.
If the indicator light does not come on
for a few seconds, then go off, have a
Yamaha dealer check the electrical cir-
cuit.
When the key is turned to “OFF” and 30
seconds have passed, the indicator
light will start flashing indicating the im-
mobilizer system is enabled. After 24
hours have passed, the indicator light
will stop flashing, however the immobi-
lizer system is still enabled.
This model is also equipped with a
self-diagnosis device for the immobiliz-
er system. (See page 3-5 for an expla-
nation of the self-diagnosis device.)
ABS
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
INSTRUMENT AND CONTROL FUNCTIONS
3-12
1
2
3
4
5
6
7
8
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.
INSTRUMENT AND CONTROL FUNCTIONS
3-18
1
2
3
4
5
6
7
8
9
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