Page 63 of 94
PERIODIC MAINTENANCE AND ADJUSTMENT
6-19
2
3
4
5
67
8
9 Left
Right
2. If dirt or water is visible, remove
the hose, clean it, and then install
it.
Cleaning the V-belt case air filter el-
ement
1. Remove cowling E. (See
page 6-7.)
2. Remove panel A. (See page 6-7.)
3. Remove the left air filter case cov-
er.
4. Remove the V-belt air filter case
cover by removing the screws.
5. Remove the V-belt case air filter
element by removing the screws.6. Lightly tap the V-belt case air filter
element to remove most of the
dust and dirt, and then blow out the
dirt with compressed air as shown.
7. Check the V-belt case air filter ele-
ment for damage and replace it if
1. Air filter check hose
1. Air filter check hose
1
1
1. Screw
2. V-belt air filter case cover
2
111
1. Screw
2. V-belt case air filter element
2
1 1
✦✧✯✬✲✦ ✤✬
Page 76 of 94
PERIODIC MAINTENANCE AND ADJUSTMENT
6-32
1
2
3
4
5
6
7
8
9For YP400 For YP400A
For YP400AFor YP400A
1. Ignition fuse
2. Signaling system fuse
3. Headlight fuse
4. Radiator fan fuse
5. Backup fuse (for clock and rear storage
compartment light)
6. Fuel injection system fuse
7. Spare fuse
7
123456
1. Spare main fuse
2. Main fuse
3. Hazard fuse
4. ABS control unit fuse
5. ABS solenoid fuse
6. ABS motor fuse
1. Fuse box
1
3
2
4
5
6
1
1. Ignition fuse
2. Signaling system fuse
3. Headlight fuse
4. Radiator fan fuse
5. Backup fuse (for clock and rear storage
compartment light)
6. Fuel injection system fuse
7. Spare fuse
7
123456
✦✧✯✬✲✦ ✦✥
Page 77 of 94
PERIODIC MAINTENANCE AND ADJUSTMENT
6-33
2
3
4
5
67
8
9
3. Turn the key to “ON” and turn on
the electrical circuit in question to
check if the device operates.
4. If the fuse immediately blows
again, have a Yamaha dealer
check the electrical system.
EAU34241
Replacing a headlight bulb
This model is equipped with halogen
bulb headlights. If a headlight bulb
burns out, have a Yamaha dealer re-
place it and, if necessary, adjust the
headlight beam.
EAU24181
Tail/brake light
This model is equipped with an
LED-type tail/brake light.
If the tail/brake light does not come on,
have a Yamaha dealer check it.
Specified fuses:
Main fuse:
40.0 A
Ignition fuse:
10.0 A
Signaling system fuse:
10.0 A
Headlight fuse:
20.0 A
Hazard fuse:
10.0 A
Radiator fan fuse:
10.0 A
Fuel injection system fuse:
10.0 A
ABS control unit fuse:
YP400A 10.0 A
ABS motor fuse:
YP400A 30.0 A
ABS solenoid fuse:
YP400A 20.0 A
Backup fuse:
10.0 A
✦✧✯✬✲✦ ✦✦
Page 78 of 94
PERIODIC MAINTENANCE AND ADJUSTMENT
6-34
1
2
3
4
5
6
7
8
9
EAU39880
Front turn signal light
If a front turn signal light does not come
on, have a Yamaha dealer check its
electrical circuit or replace the bulb.
EAU34263
Replacing a rear turn signal
light bulb
1. Place the scooter on the center-
stand.
2. Remove cowling C for replacing
the left turn signal light bulb or
cowling D for replacing the right
turn signal light bulb. (See
page 6-7.)
3. Remove the socket (together with
the turn signal light bulb) by turning
it counterclockwise.
4. Remove the burnt-out bulb by
pushing it in and turning it counter-
clockwise.
5. Insert a new bulb into the socket,push it in, and then turn it clock-
wise until it stops.
6. Install the socket (together with the
bulb) by turning it clockwise.
7. Install the cowling removed.
1. Turn signal light bulb socket
1
1. Turn signal light bulb
2. Turn signal light bulb socket
2
1
✦✧✯✬✲✦ ✦✧
Page 79 of 94
PERIODIC MAINTENANCE AND ADJUSTMENT
6-35
2
3
4
5
67
8
9
EAU47900
Replacing the license plate
light bulb
1. Place the scooter on the center-
stand.
2. Remove cowling B. (See
page 6-7.)
3. Remove the license plate light cov-
er and license plate light lens by
removing the screws.
4. Remove the burnt-out bulb by pull-
ing it out.5. Insert a new bulb into the socket.
6. Install the license plate light lens
and license plate light cover by in-
stalling the screws.
7. Install the cowling.
EAU39020
Auxiliary light bulb
If the auxiliary light does not come on,
have a Yamaha dealer check the elec-
trical circuit or replace the bulb.
1. License plate light lens
2. License plate light cover
3. Screw
2
3
1
1. License plate light bulb
1
✦✧✯✬✲✦ ✦
Page 80 of 94

PERIODIC MAINTENANCE AND ADJUSTMENT
6-36
1
2
3
4
5
6
7
8
9
EAU25881
Troubleshooting
Although Yamaha scooters receive a
thorough inspection before shipment
from the factory, trouble may occur dur-
ing operation. Any problem in the fuel,
compression, or ignition systems, for
example, can cause poor starting and
loss of power.
The following troubleshooting charts
represent quick and easy procedures
for checking these vital systems your-
self. However, should your scooter re-
quire any repair, take it to a Yamaha
dealer, whose skilled technicians have
the necessary tools, experience, and
know-how to service the scooter prop-
erly.
Use only genuine Yamaha replace-
ment parts. Imitation parts may look like
Yamaha parts, but they are often inferi-
or, have a shorter service life and can
lead to expensive repair bills.
WARNING
EWA15141
When checking the fuel system, do
not smoke, and make sure there are
no open flames or sparks in the ar-
ea, including pilot lights from waterheaters or furnaces. Gasoline or
gasoline vapors can ignite or ex-
plode, causing severe injury or
property damage.
✦✧✯✬✲✦ ✦✩
Page 83 of 94

7-1
2
3
4
5
6
78
9
SCOOTER CARE AND STORAGE
EAU37833
Matte color caution
NOTICE
ECA15192
Some models are equipped with
matte colored finished parts. Be
sure to consult a Yamaha dealer for
advice on what products to use be-
fore cleaning the vehicle. Using a
brush, harsh chemical products or
cleaning compounds when clean-
ing these parts will scratch or dam-
age their surface. Wax also should
not be applied to any matte colored
finished parts.
EAU26094
Care
While the open design of a scooter re-
veals the attractiveness of the technol-
ogy, it also makes it more vulnerable.
Rust and corrosion can develop even if
high-quality components are used. A
rusty exhaust pipe may go unnoticed
on a car, however, it detracts from the
overall appearance of a scooter. Fre-
quent and proper care does not only
comply with the terms of the warranty,
but it will also keep your scooter looking
good, extend its life and optimize its
performance.
Before cleaning
1. Cover the muffler outlet with a
plastic bag after the engine has
cooled down.
2. Make sure that all caps and covers
as well as all electrical couplers
and connectors, including the
spark plug cap, are tightly in-
stalled.
3. Remove extremely stubborn dirt,
like oil burnt onto the crankcase,
with a degreasing agent and a
brush, but never apply such prod-ucts onto seals, gaskets and wheel
axles. Always rinse the dirt and de-
greaser off with water.
Cleaning
NOTICE
ECA10783
Avoid using strong acidic
wheel cleaners, especially on
spoked wheels. If such prod-
ucts are used on hard-to-re-
move dirt, do not leave the
cleaner on the affected area
any longer than instructed. Al-
so, thoroughly rinse the area
off with water, immediately dry
it, and then apply a corrosion
protection spray.
Improper cleaning can damage
plastic parts (such as cowl-
ings, panels, windshields,
headlight lenses, meter lens-
es, etc.) and the mufflers. Use
only a soft, clean cloth or
sponge with water to clean
plastic. However, if the plastic
parts cannot be thoroughly
cleaned with water, diluted
mild detergent with water may
✦✧✯✬✲✦ ✤
Page 84 of 94

SCOOTER CARE AND STORAGE
7-2
1
2
3
4
5
6
7
8
9be used. Be sure to rinse off any
detergent residue using plenty
of water, as it is harmful to plas-
tic parts.
Do not use any harsh chemical
products on plastic parts. Be
sure to avoid using cloths or
sponges which have been in
contact with strong or abrasive
cleaning products, solvent or
thinner, fuel (gasoline), rust re-
movers or inhibitors, brake flu-
id, antifreeze or electrolyte.
Do not use high-pressure wash-
ers or steam-jet cleaners since
they cause water seepage and
deterioration in the following ar-
eas: seals (of wheel and swing-
arm bearings, fork and brakes),
electric components (couplers,
connectors, instruments,
switches and lights), breather
hoses and vents.
For scooters equipped with a
windshield: Do not use strong
cleaners or hard sponges as
they will cause dulling or
scratching. Some cleaning com-pounds for plastic may leave
scratches on the windshield.
Test the product on a small hid-
den part of the windshield to
make sure that it does not leave
any marks. If the windshield is
scratched, use a quality plastic
polishing compound after
washing.
After normal use
Remove dirt with warm water, a mild
detergent, and a soft, clean sponge,
and then rinse thoroughly with clean
water. Use a toothbrush or bottlebrush
for hard-to-reach areas. Stubborn dirt
and insects will come off more easily if
the area is covered with a wet cloth for
a few minutes before cleaning.
After riding in the rain, near the sea oron salt-sprayed roadsSince sea salt or salt sprayed on the
roads during winter are extremely cor-
rosive in combination with water, carry
out the following steps after each ride in
the rain, near the sea or on
salt-sprayed roads.
TIP
Salt sprayed on roads in the winter may
remain well into spring.
1. Clean the scooter with cold water
and a mild detergent after the en-
gine has cooled down.
NOTICE:
Do not use warm water since it
increases the corrosive action
of the salt.
[ECA10791]
2. Apply a corrosion protection spray
on all metal, including chrome- and
nickel-plated, surfaces to prevent
corrosion.
After cleaning
1. Dry the scooter with a chamois or
an absorbing cloth.
2. Use a chrome polish to shine
chrome, aluminum and stain-
less-steel parts, including the ex-
haust system. (Even the thermally
induced discoloring of stain-
less-steel exhaust systems can be
removed through polishing.)
3. To prevent corrosion, it is recom-
mended to apply a corrosion pro-
tection spray on all metal,
including chrome- and nickel-plat-
✦✧✯✬✲✦ ✥