2003 YAMAHA WHY 50 maintenance

PERIODIC MAINTENANCE AND MINOR REPAIR
6
EW000119
Headlight bulbs get very hot.
Therefore, keep flammable products
away from a lit headlight bulb, and
do not touch the bulb until it has
cooled down.
4. Place a new bulb into position,
and then secure it with the bulb
holder.
5. Connect the lead connectors, and
then install the headlight unit by
installing the screws.
6. Have a Yamaha dealer adjust the
headlight beam if necessary.
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EAU00846
Replacing the headlight bulb
If the headlight bulb burns out, replace
it as follows.
1. Remove the headlight unit by
removing the screws.
2. Disconnect the headlight lead
connectors.
3. Remove the headlight bulb holder
by pushing it inward and turning it
counterclockwise, and then
remove the defective bulb.
1
ZAUM0381
1. Headlight bulb holder
EC000103
Do not use a fuse of a higher amperage
rating than recommended to avoid
causing extensive damage to the
electrical system and possibly a fire.
3. Turn the key to "
" and turn on
the electrical circuits to check if the
devices operate.
4. If the fuse immediately blows
again, have a Yamaha dealer
check the electrical system.

PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAUM0037
Replacing the brake/taillight
bulb
1. Remove the brake/taillight lens by
removing the screws.
2. Remove the brake/taillight bulb
holder by turning it 1/4 turn
counter-clockwise.
3. Remove the defective bulb.
4. Place a new bulb into position,
and then secure it with the bulb
holder.
5. Place the brake/taillight lens in the
original position, and then install
the screw.
ZAUM0382
EAU03497
Replacing a turn signal light
bulb
1. Remove the turn signal light lens
by removing the screw.
2. Remove the defective bulb by
pushing it in and turning it
counterclockwise.
3. Insert a new bulb into the socket,
push it in, and then turn it
clockwise until it stops.
4. Install the lens by installing the
screw.
ECA00065
Do not overtighten the screw,
otherwise the lens may break.
ZAUM0383
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PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU01008
Troubleshooting
Although Yamaha scooters receive a
thorough inspection before shipment
from the factory, trouble may occur
during operation. Any problem in the
fuel, compression, or ignition systems,
for example, can cause poor starting
and loss of power.
The following troubleshooting chart
represents a quick and easy procedure
for checking these vital systems
yourself. However, should your scooter
require any repair, take it to a Yamaha
dealer, whose skilled technicians have
the necessary tools, experience, and
know-how to service the scooter
properly.
Use only genuine Yamaha replacement
parts. Imitation parts may look like
Yamaha parts, but they are often
inferior, have a shorter service life and
can lead to expensive repair bills.
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PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU01397
Troubleshooting chartEW000125
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. FuelThere 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. CompressionThere 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. IgnitionWipe 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. BatteryThe engine turns over
quickly.
The engine turns over
slowly.The battery is good.
Check the battery lead connections,
and charge the battery if necessary.
Dry
WetOpen the throttle halfway and operate
the electric starter.
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