2003 YAMAHA SLIDER 50 air condition

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
4-1

4
PRE-OPERATION CHECKS
ITEM CHECKS PAGE
NOTE :
Pre-operation checks should be made each time the scooter is used. Such an inspection can be accomplished in a very
short time; and the added safety it assures is more than worth the time involved.
EWA00033
If any item in the Pre-operation check list is not working properly, have it inspected and repaired before operating
the scooter.
4-2 • Check for damage.
Wheels and Tires• Check tire condition and tread depth.
6-9 — 6-11
• Check air pressure.
• Correct if necessary.
Brake levers• Make sure that operation is smooth.
3-4 — 3-5
• Lubricate lever pivoting points if necessary.
Centerstand• Make sure that operation is smooth.
6-15
• Lubricate pivot if necessary.
Chassis-fasteners• Make sure that all nuts, bolts and screws are properly tightened.
—
• Tighten if necessary.
Instruments, lights• Check operation.
3-1 — 3-4, 6-20 — 6-21
signals and switches• Correct if necessary.
Battery• Check fluid level.
6-17
• Fill with distilled water if necessary.

PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU00466*
EW000061
This scooter is designed for use on
paved roads only. If this scooter is
operated in abnormally dusty,
muddy or wet conditions, the air
filter element should be cleaned or
replaced more frequently, otherwise
rapid engine wear may result.
Consult a Yamaha dealer for proper
maintenance intervals.
EAU03453
Safety is an obligation of the owner.
Periodic inspection, adjustment and
lubrication will keep your vehicle in the
safest and most efficient condition pos-
sible. The most important points of
scooter inspection, adjustment, and
lubrication are explained on the
following pages.
EW000060
If you are not familiar with scooter
maintenance work, have a Yamaha
dealer do it for you.
EW000063
Modifications not approved by
Yamaha may cause loss of perfor-
mance and render the vehicle unsafe
for use. Consult a Yamaha dealer
before attempting any changes.
6-1

PERIODIC MAINTENANCE AND MINOR REPAIR
6
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Checking the spark plug
The spark plug is an important engine
component, which should be checked
periodically, preferably by a Yamaha
dealer. Since heat and deposits will
cause any spark plug to slowly erode,
it should be removed and checked in
accordance with the periodic mainte-
nance and lubrication chart. In addition,
the condition of the spark plug can
reveal the condition of the engine.The porcelain insulator around the
center electrode of the spark plug
should be a medium-to-light tan (the
ideal color when the scooter is ridden
normally). If the spark plug shows a
distinctly different color, the engine
could be defective. Do not attempt to
diagnose such problems yourself.
Instead, have a Yamaha dealer check
the scooter.
If the spark plug shows signs of
electrode erosion and excessive
carbon or other deposits, it should be
replaced.
Specified spark plug:
BR8HS (NGK)
or BR9HS (NGK)
Before installing a spark plug, the spark
plug gap should be measured with a
wire thickness gauge and, if necessary,
adjusted to specification.
Spark plug gap:
0.5 - 0.7 mmClean the surface of the spark plug
gasket and its mating surface, and then
wipe off any grime from the spark plug
threads.
Tightening torque:
Spark plug:
20 Nm (2.0 m
•kg)
NOTE :
If a torque wrench is not available when
installing a spark plug, a good estimate
of the correct torque is 1/4 - 1/2 turn
past finger tight. However, the spark
plug should be tightened to the
specified torque as soon as possible.
a
ZAUM0037
a. Spark plug gap
6-5

PERIODIC MAINTENANCE AND MINOR REPAIR
6
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Tires
To maximize the performance,
durability, and safe operation of your
scooter, note the following points
regarding the specified tires.
Tire air pressure
The tire air pressure should be checked
and, if necessary, adjusted before each
ride.
ZAUM0053
EW000082
•The tire air pressure must be
checked and adjusted on cold
tires (i.e., when the temperature
of the tires equals the ambient
temperature).
•The tire air pressure must be
adjusted in accordance with the
riding speed and with the total
weight of rider, passenger,
cargo, and accessories
approved for this model.
EW000077
Because loading has an enormous
impact on the handling, braking, per-
formance and safety characteristics of
your scooter, you should keep the
following precautions in mind.
•NEVER OVERLOAD THE SCOO-
TER! Operation of an overloaded
scooter may result in tire damage,
loss of control, or severe injury.
Make sure that the total weight of
rider, cargo, and accessories
does not exceed the specified
maximum load for the vehicle.
•Do not carry along loosely packed
items, which can shift during a
ride.
•Securely pack the heaviest items
close to the center of the scooter
and distribute the weight evenly
on both sides.
•Adjust the suspension and tire air
pressure with regard to the load.
Check the tire condition and air
pressure before each ride.
Tire air pressure
(measured on cold tires)
Load* Front Rear
Up to 90 kg150 kPa
1.5 kgf/cm
2
1.5 bar150 kPa
1.5 kgf/cm
2
1.5 bar
90 kg load-maximum
150 kPa
1.5 kgf/cm2
1.5 bar170 kPa
1.7 kgf/cm
2
1.7 bar
Maximum load* 184 kg
* Total weight of rider, passenger, cargo and
accessories
6-9

PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU03773
Cast wheels
To maximize the performance,
durability, and safe operation of your
scooter, note the following points
regarding the specified wheels.
•The wheel rims should be
checked for cracks, bends or
warpage before each ride. If any
damage is found, have a Yamaha
dealer replace the wheel. Do not
attempt even the smallest repair
to the wheel. A deformed or
cracked wheel must be replaced.
•The wheel should be balanced
whenever either the tire or wheel
has been changed or replaced. An
unbalanced wheel can result in
poor performance, adverse
handling characteristics, and a
shortened tire life.
•Ride at moderate speeds after
changing a tire since the tire sur-
face must first be "broken in" for it
to develop its optimal
characteristics.
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Adjusting the front brake
lever free play
The brake lever free play should
measure 10 - 20 mm as shown.
Periodically check the brake lever free
play and, if necessary, have a Yamaha
dealer adjust it.
EW000100
An incorrect brake lever free play
indicates a hazardous condition in
the brake system. Do not operate the
scooter until the brake system has
been checked or repaired by a
Yamaha dealer.
a
ZAUM0107
a
ZAUM0108
a. Front brake lever free playa. Rear brake lever free play
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Adjusting the rear brake
lever free play
The brake lever free play should
measure 10 - 20 mm as shown.
Periodically check the brake lever free
play and, if necessary, adjust it as
follows.
6-11

PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAUM0008
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.
EAU02962
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
EW000112
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
EAU02939
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
EW000115
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.
EC000098
If any damage is found or the front
fork does not operate smoothly,
have a Yamaha dealer check or
repair it.
ZAUM0159
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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.
EW000115
Securely support the scooter so that
there is no danger of it falling over.
6-16