2004 YAMAHA SLIDER 50 oil level

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.
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U
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H
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OFF “”
All electrical systems are off. The key
can be removed.
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*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 “
” po-
sition, release it, and then turn it
to “
”.
3. Remove the key.
To unlock the steering
Insert the key and turn it to “
”.
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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 scooter is stopped
before turning the key to “
” or
“”.
NOTE :
Remove the key from the main switch
when the scooter will be left
unattended.
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ON “”
All electrical circuits are supplied with
power, the taillight and meter lighting
come on, and the engine can be
started. The key cannot be removed.
NOTE :
The headlight comes on as soon as the
engine is started.

INSTRUMENT AND CONTROL FUNCTIONS
31
23
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Indicator and warning lights
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Turn signal indicator light “”
This indicator light flashes when the
turn signal switch is pushed to the left
or right.
1. Turn signal indicator light “”
2. High beam indicator light “
”
3. Oil level warning light “”
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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 cir-
cuit.
3-2
EC000000
Do not operate the scooter until you
know that the engine oil level is
sufficient.

PRE-OPERATION CHECKS
4The condition of a vehicle is the owner’s responsibility. Vital components can start to deteriorate quickly and unexpectedly,
even if the vehicle remains unused (for example, as a result of exposure to the elements). Any damage, fluid leakage or
loss of tire air pressure could have serious consequences. Therefore, it is very important, in addition to a thorough visual
inspection, to check the following points before each ride.
ITEM CHECKS PAGE
• Check fuel level in fuel tank.
Fuel• Refuel if necessary.3-6
• Check fuel line for leakage.
• Check oil level in oil tank.
Two-stroke engine oil• If necessary, add recommended oil to specified level. 3-7
• Check vehicle for oil leakage.
Final transmission oil• Check oil level and vehicle for oil leakage. 6-6
• Check operation.
• If soft or spongy, have Yamaha dealer bleed hydraulic system.
Front brake• Check fluid level in reservoir. 3-4, 6-11
• If necessary, add recommended brake fluid to specified level.
• Check hydraulic system for leakage.
• Check operation.
Rear brake• Check lever free play. 3-5, 6-11
• Adjust if necessary.
• Make sure that operation is smooth.
Throttle grip• Check cable free play.
6-8
• If necessary, have Yamaha dealer adjust cable free play
and lubricate cable and grip housing.
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Pre-operation check list
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OPERATION AND IMPORTANT RIDING POINTS
5
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•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.
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Starting the engine
1. Turn the key to “
*
”, then when
the oil level warning light comes
on, turn it to “
”.
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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 3-7 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) knob/lever back
halfway.
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PERIODIC MAINTENANCE AND MINOR REPAIR
Periodic maintenance and lubrication chart ............ 6-2
Checking the spark plug ......................................... 6-5
Final transmission oil .............................................. 6-6
Cleaning the air filter element ................................. 6-7
Adjusting the carburetor .......................................... 6-8
Adjusting the throttle cable free play ....................... 6-8
Tires ........................................................................ 6-9
Cast wheels .......................................................... 6-11
Adjusting the front brake lever free play ............... 6-11
Adjusting the rear brake lever free play ................ 6-11
Checking the front brake pads
and rear brake shoes ............................................ 6-12
Checking the brake fluid level ............................... 6-13
Changing the brake fluid ....................................... 6-14
Checking and lubricating the cables ..................... 6-14
6 Checking and lubricating the throttle grip
and cable .............................................................. 6-15
Lubricating the front and rear brake levers ........... 6-15
Checking and lubricating the centerstand ............. 6-15
Checking the front fork .......................................... 6-16
Checking the steering ........................................... 6-16
Checking the wheel bearings ................................ 6-17
Battery ................................................................... 6-17
Replacing the fuse ................................................ 6-19
Replacing a headlight bulb .................................... 6-20
Replacing a front turn signal light bulb .................. 6-21
Replacing a rear turn signal light bulb or
the tail/brake light bulb .......................................... 6-21
Troubleshooting .................................................... 6-21
Troubleshooting chart ........................................... 6-22

PERIODIC MAINTENANCE AND MINOR REPAIR
6
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Rear brake shoes
The rear brake is provided with a wear
indicator, which allows you to check the
brake shoe wear without having to
disassemble the brake. To check the
brake shoe wear, check the position of
the wear indicator while applying the
brake. If a brake shoe has worn to the
point that the wear indicator reaches
the wear limit line, have a Yamaha dea-
ler replace the brake shoes as a set.
1
2
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1. Wear indicator
2. Wear limit
1
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1. Minimum level mark
6-13
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Checking the brake fluid level
Insufficient brake fluid may allow air to
enter the brake system, possibly causing
it to become ineffective.
Before riding, check that the brake fluid
is above the minimum level mark and
replenish if necessary. A low brake fluid
level may indicate worn brake pads and/
or brake system leakage. If the brake
level is low, be sure to check the brake
pads for wear and the brake system for
leakage.Observe these precautions:
•When checking the fluid level,
make sure that the top of the
master cylinder is level by turning
the handlebars.
•Use only the recommended quality
brake fluid, otherwise the rubber
seals may deteriorate, causing
leakage and poor braking perfor-
mance.
Recommended brake fluid:
DOT 4
NOTE :
If DOT 4 is not available, DOT 3 can be
used.
•Refill with the same type of brake
fluid. Mixing fluids may result in a
harmful chemical reaction and lead
to poor braking performance.
•Be careful that water does not en-
ter the master cylinder when
refilling. Water will significantly
lower the boiling point of the fluid
and may result in vapor lock.

PERIODIC MAINTENANCE AND MINOR REPAIR
6
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Changing the brake fluid
Have a Yamaha dealer change the
brake fluid at the intervals specified in
the periodic maintenance and
lubrication chart. In addition, have the
brake hose replaced every four years
or whenever it is damaged or leaking.
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Checking and lubricating the
cables
The operation of all control cables and
the condition of the cables should be
checked before each ride, and the
cables and cable ends should be
lubricated if necessary. If a cable is
damaged or does not move smoothly,
have a Yamaha dealer check or replace
it.
Recommended lubricant:
Engine oil
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Damage to the outer sheath may
interfere with proper cable operation
and will cause the inner cable to
rust. Replace a damaged cable as
soon as possible to prevent unsafe
conditions.
6-14
•Brake fluid may deteriorate painted
surfaces or plastic parts. Always
clean up spilled fluid immediately.
•As the brake pads wear, it is nor-
mal for the brake fluid level to
gradually go down. However, if the
brake fluid level goes down
suddenly, have a Yamaha dealer
check the cause.

PERIODIC MAINTENANCE AND MINOR REPAIR
6
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Checking the front fork
The condition and operation of the front
fork must be checked as follows at the
intervals specified in the periodic main-
tenance and lubrication chart.
To check the condition
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Securely support the scooter so that
there is no danger of it falling over.
Check the inner tubes for scratches,
damage and excessive oil leakage.To check the operation
1. Place the scooter on a level sur-
face and hold it in an upright po-
sition.
2. While applying the front brake,
push down hard on the
handlebars several times to check
if the front fork compresses and
rebounds smoothly.
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If any damage is found or the front
fork does not operate smoothly,
have a Yamaha dealer check or
repair it.
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Checking the steering
Worn or loose steering bearings may
cause danger. Therefore, the operation
of the steering must be checked as
follows at the intervals specified in the
periodic maintenance and lubrication
chart.
1. Place a stand under the engine
to raise the front wheel off the
ground.
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Securely support the scooter so that
there is no danger of it falling over.
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