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)
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
3-18
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
5-1
2
3
4
56
7
8
9
OPERATION AND IMPORTANT RIDING POINTS
EAU15980
WARNING
EWA10870
Become thoroughly familiar
with all operating controls and
their functions before riding.
Consult a Yamaha dealer re-
garding any control or function
that you do not thoroughly un-
derstand.
Never start the engine or oper-
ate it in a closed area for any
length of time. Exhaust fumes
are poisonous, and inhaling
them can cause loss of con-
sciousness and death within a
short time. Always make sure
that there is adequate ventila-
tion.
For safety, always start the en-
gine with the centerstand down.
EAU34460
Starting the engine
CAUTION:
ECA10250
See page 5-4 for engine break-in in-
structions prior to operating the ve-
hicle for the first time.
In order for the ignition circuit cut-off
system to enable starting, the side-
stand must be up.
WARNING
EWA10290
Before starting the engine,
check the function of the igni-
tion circuit cut-off system ac-
cording to the procedure
described on page 3-20.
Never ride with the sidestand
down.
1. Turn the key to “ON” and make
sure that the engine stop switch is
set to “”.
2. Close the throttle completely.
3. Start the engine by pushing the
start switch while applying the front
or rear brake.
NOTE:
If the engine does not start, release thestart switch, wait a few seconds, and
then try again. Each starting attempt
should be as short as possible to pre-
serve the battery. Do not crank the en-
gine more than 10 seconds on any one
attempt.
CAUTION:
ECA11040
For maximum engine life, never ac-
celerate hard when the engine is
cold!
PERIODIC MAINTENANCE AND MINOR REPAIR
6-32
1
2
3
4
5
6
7
8
9
EAU34221
Battery
The battery is located behind cowling
A. (See page 6-7.)
This model is equipped with a
sealed-type (MF) battery, which does
not require any maintenance. There is
no need to check the electrolyte or to
add distilled water.
WARNING
EWA10760
Electrolyte is poisonous and
dangerous since it contains sul-
furic acid, which causes severe
burns. Avoid any contact with
skin, eyes or clothing and al-
ways shield your eyes whenworking near batteries. In case
of contact, administer the fol-
lowing FIRST AID.
EXTERNAL: Flush with plenty
of water.
INTERNAL: Drink large quan-
tities of water or milk and im-
mediately call a physician.
EYES: Flush with water for 15
minutes and seek prompt
medical attention.
Batteries produce explosive hy-
drogen gas. Therefore, keep
sparks, flames, cigarettes, etc.,
away from the battery and pro-
vide sufficient ventilation when
charging it in an enclosed
space.
KEEP THIS AND ALL BATTER-
IES OUT OF THE REACH OF
CHILDREN.
To charge the battery
Have a Yamaha dealer charge the bat-
tery as soon as possible if it seems to
have discharged. Keep in mind that the
battery tends to discharge more quickly
if the vehicle is equipped with optionalelectrical accessories.
To store the battery
1. If the vehicle will not be used for
more than one month, remove the
battery, fully charge it, and then
place it in a cool, dry place.
2. If the battery will be stored for more
than two months, check it at least
once a month and fully charge it if
necessary.
3. Fully charge the battery before in-
stallation.
4. After installation, make sure that
the battery leads are properly con-
nected to the battery terminals.
CAUTION:
ECA10630
Always keep the battery
charged. Storing a discharged
battery can cause permanent
battery damage.
To charge a sealed-type (MF)
battery, a special (constant-volt-
age) battery charger is required.
Using a conventional battery
charger will damage the battery.
If you do not have access to a
sealed-type (MF) battery charg-
1. Battery
1
PERIODIC MAINTENANCE AND MINOR REPAIR
6-33
2
3
4
5
67
8
9 er, have a Yamaha dealer
charge your battery.
EAU42820
Replacing the fuses
The main fuse and the fuse box, which
contains the fuses for the individual cir-
cuits, are located behind cowling A.
(See page 6-7.)
If a fuse is blown, replace it as follows.
1. Turn the key to “OFF” and turn off
the electrical circuit in question.
2. Remove the blown fuse, and then
install a new fuse of the specified
amperage.
NOTE:
If the main fuse is blown, remove the
grab bar to access the main fuse. After
replacing the main fuse, install the grab
bar. (See page 6-7.)
(for non-ABS models)
1. Spare main fuse
2. Main fuse
1. Fuse box
2. Hazard fuse
1
2
1
2
PERIODIC MAINTENANCE AND MINOR REPAIR
6-40
1
2
3
4
5
6
7
8
9
EAU42700
Troubleshooting charts
Starting problems or poor engine
performance
WARNING
EWA10840
Keep away open flames and do not smoke while checking or working on the fuel system.
Check the fuel level in
the fuel tank.1. Fuel
There is enough fuel.
There is no fuel.
Check the compression.
Supply fuel.
The engine does not start.
Check the compression.
Operate the electric starter.2. Compression
There is compression.
There is no compression.
Check the ignition.
Have a Yamaha dealer
check the vehicle.
Remove the spark plug
and check the electrodes.3. Ignition
Wipe off with a dry cloth and correct the
spark plug gap, or replace the spark plug.
Have a Yamaha dealer check the vehicle.
The engine does not start.
Have a Yamaha dealer
check the vehicle.
The engine does not start.
Check the battery.
Operate the electric starter.4. Battery
The engine turns over
quickly.
The engine turns over
slowly.
The battery is good.Check the battery lead connections,
and charge the battery if necessary.
DryWet
Operate the electric starter.