2004 YAMAHA AEROX50 key

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IMPORTANT MANUAL INFORMATION
Particularly important information is distinguished in this manual by the following notations:
The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS
INVOLVED!
Failure to follow WARNING instructions
could result in severe injury or death to the
scooter operator, a bystander, or a person inspecting or repairing the scooter.
A CAUTION indicates special precautions that must be taken to avoid damage to the
scooter.
NOTE :A NOTE provides key information to make procedures easier or clearer.WARNING
CAUTION:
NOTE :
•This manual should be considered a permanent part of this scooter and should remain with it even if the
scooter is subsequently sold.
•Yamaha continually seeks advancements in product design and quality. Therefore, while this manual
contains the most current product information available at the time of printing, there may be minor
discrepancies between your scooter and this manual. If you have any questions concerning this manual,
please consult your Yamaha dealer.

3
INSTRUMENT AND CONTROL FUNCTIONS
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Main switch/steering lock
The main switch/steering lock controls
the ignition and lighting systems, and
is used to lock the steering. The various
positions are described below.
PUSH
OPEN
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OFF “ ”
All electrical systems are off. The key
can be removed.
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CHECK “”
The 2-stroke engine oil level warning
light should come on. See page 3-2 for
an explanation of the engine oil level
warning light.
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LOCK “ ”
The steering is locked, and all electrical
systems are off. The key can be
removed.
To lock the steering
1. Turn the handlebars all the way to
the left.
2. Push the key in from the “
”
position, and then turn it to “
”
while still pushing it.
3. Remove the key.
To unlock the steering
Push the key in, and then turn it to “
”
while still pushing it.
EW000016
Never turn the key to “ ” or “ ”
while the scooter is moving, otherwise
the electrical systems will be switched
off, which may result in loss of control
or an accident. Make sure that the scoo-
ter is stopped before turning the key
to “ ” or “ ”.
WARNING
3-1
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ON “ ”
All electrical circuits are supplied with
power, and the engine can be started.
The key cannot be removed.
NOTE :
The headlight, meter lighting and
taillight come on automatically when the
engine is started.

INSTRUMENT AND CONTROL FUNCTIONS
3
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Indicator and warning lights
TEMP
123
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1. Turn signal indicator light “ ”
2. High beam indicator light “
”
3. Oil indicator light “ ”
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Turn signal indicator light “ ”
This indicator light flashes when the
turn signal switch is pushed to the left
or right.
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High beam indicator light “ ”
This indicator light comes on when the
high beam of the headlight is switched
on.
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Oil level warning light “ ”
This warning light comes on when the
key is in the “
” position or when the
oil level in the 2-stroke engine oil tank
is low during operation. If the warning
light comes on during operation, stop
immediately and fill the oil tank with
Yamalube 2 or equivalent 2-stroke
engine oil of either JASO grade "FC"
or ISO grades "EG-C" or "EG-D". The
warning light should go off after the 2-
stroke engine oil tank has been refilled.
NOTE :
If the warning light does not come on
when the key is in the “
” position or
does not go off after the 2-stroke engine
oil tank has been refilled, have a Yamaha
dealer check the electrical circuit.
EC000000
Do not operate the scooter until you
know that the engine oil level is
sufficient.
CAUTION:
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Coolant temperature warning light
“
”
This warning light comes on when the
engine overheats. When this occurs,
stop the engine immediately and allow
the engine to cool.
EC000002
Do not operate the engine if it is
overheated.
CAUTION:
TEMP
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1. Coolant temperature warning light “ ”
3-2

3
INSTRUMENT AND CONTROL FUNCTIONS
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Front brake lever
The front brake lever is located on the
right handlebar grip. To apply the front
brake, pull this lever toward the
handlebar grip.
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Rear brake lever
The rear brake lever is located on the
left handlebar grip. To apply the rear
brake, pull this lever toward the
handlebar grip.
1. Front brake lever 1. Rear brake lever
1
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1
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Fuel tank cap
To open the fuel tank cap
Open the fuel tank cap lock cover, insert
the key into the lock, and then turn it 1/4
turn counterclockwise. The lock will be
released and the fuel tank cap can be
opened.
1
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3-51. Fuel tank cap

INSTRUMENT AND CONTROL FUNCTIONS
3 To close the fuel tank cap
1. Push the fuel tank cap into posi-
tion with the key inserted in the
lock.
2. Turn the key clockwise to the ori-
ginal position, remove it, and then
close the lock cover.
NOTE :
The fuel tank cap cannot be closed
unless the key is in the lock. In addi-
tion, the key cannot be removed if the
cap is not properly closed and locked.
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Make sure that the fuel tank cap is
properly closed before riding.
WARNING
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Fuel
Make sure that there is sufficient fuel
in the tank. Fill the fuel tank to the
bottom of the filler tube as shown.
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•Do not overfill the fuel tank,
otherwise it may overflow when
the fuel warms up and expands.
•Avoid spilling fuel on the hot
engine.
WARNING
1
2
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1. Filler tube
2. Fuel level
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EC000008
Immediately wipe off spilled fuel with
a clean, dry, soft cloth, since fuel may
deteriorate painted surfaces or plas-
tic parts.
CAUTION:
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Recommended fuel:
REGULAR UNLEADED
GASOLINE ONLY
Fuel tank capacity:
Total amount:
7 L
Your Yamaha engine has been
designed to use regular unleaded
gasoline with a research octane
number of 91 or higher. If knocking (or
pinging) occurs, use a gasoline of a
different brand or premium unleaded
fuel. Use of unleaded fuel will extend
spark plug life and reduce maintenance
costs.
3-6

3
INSTRUMENT AND CONTROL FUNCTIONS
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Rider seat
To open the rider seat
1. Place the scooter on the
centerstand.
2. Insert the key into the main switch,
and then turn it counterclockwise.
NOTE :
Do not push inward when turning the
key.
3. Fold the rider seat up.To close the rider seat
1. Fold the rider seat down, and then
push it down to lock it in place.
2. Remove the key from the main
switch if the scooter will be left
unattended.
NOTE :
Make sure that the seat is properly
secured before riding.
1
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1. Seat
3-9
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Starter (choke) lever ""
Starting a cold engine requires a richer
air-fuel mixture, which is supplied by the
starter (choke).
•Move the lever in direction a to
turn on the starter (choke).
•Move the lever in direction b to
turn off the starter (choke).
1. Starter (choke) lever ""
a
b
1
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3
INSTRUMENT AND CONTROL FUNCTIONS
a
1
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1. Storage compartment lock
a Open
3-11
ba
12
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Adjusting the shock absor-
ber assembly
(depends on model)
This shock absorber assembly is
equipped with a spring preload
adjusting ring.
EC000015
Never attempt to turn an adjusting
mechanism beyond the maximum or
minimum settings.Adjust the spring preload as follows.
•To increase the spring preload and
thereby harden the suspension,
turn the adjusting ring in direction
a .
•To decrease the spring preload
and thereby soften the suspen-
sion, turn the adjusting ring in di-
rection b .
NOTE :
Align the appropriate notch in the
adjusting ring with the position indicator
on the shock absorber.
CAUTION:
Setting
Minimum (soft)
b
Standardmiddle
Maximum (hard)a
1. Spring preload adjusting ring
2. Position indicator
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Storage compartment B
The storage compartment is located in
front of the seat.
To open the storage compartment
1. Insert the key into the lock, and
then turn it clockwise.
2. Fold the storage compartment
cover up.
To close the storage compartment
1. Fold the storage compartment
cover down.
2. Turn the key counterclockwise,
and then remove it.

OPERATION AND IMPORTANT RIDING POINTS
5
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EW000129
•Become thoroughly familiar
with all operating controls and
their functions before riding.
Consult a Yamaha dealer
regarding any control or
function that you do not
thoroughly understand.
•Never start the engine or
operate it in a closed area for
any length of time. Exhaust fu-
mes are poisonous, and
inhaling them can cause loss of
consciousness and death
within a short time. Always
make sure that there is
adequate ventilation.
•For safety, always start the
engine with the centerstand
down.
WARNING
CAUTION:
CAUTION:
PUSH
OPEN
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5-1
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Starting the engine
1. Turn the key to "", then when the
oil level warning light comes on,
turn it to "
".
EC000045
If the oil level warning light does not
come on, have a Yamaha dealer
check the electrical circuit.
2. Turn the starter (choke) on and
completely close the throttle. (See
page 3-9 for starter (choke)
operation.)3. Start the engine by pushing the
start switch or by pushing the
kickstarter lever down, while
applying the front or rear brake.
NOTE :
If the engine fails to start by pushing
the start switch, release the switch, wait
a few seconds, and then try again. Each
starting attempt should be as short as
possible to preserve the battery. Do not
crank the engine more than 5 seconds
on any one attempt. If the engine does
not start with the starter motor, try using
the kickstarter.
4. After starting the engine, move the
starter (choke) lever back halfway.
ECA00045
For maximum engine life, never
accelerate hard when the engine is
cold!