2003 YAMAHA TW125 Owners Manual

6-25
PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU03985
Changing the brake fluid
Have a Yamaha dealer change the
brake fluid at the intervals specified in
the NOTE after the periodic mainte-
nance and lubrication chart. In addi-
tion, have the oil seals of the brake
master cylinder and caliper as well as
the brake hose replaced at the inter-
vals listed below or whenever they
are damaged or leaking.
8Oil seals: Replace every two
years.
8Brake hose: Replace every four
years.
EAU00744
Drive chain slack
The drive chain slack should be
checked before each ride and adjust-
ed if necessary.
To check the drive chain slack
1. Place the motorcycle on a level
surface and hold it in an upright
position.
NOTE:
When checking and adjusting the
drive chain slack, the motorcycle
should be positioned straight up and
there should be no weight on it.2. Shift the transmission into the
neutral position.
3. Move the rear wheel by pushing
the motorcycle to locate the tight-
est portion of the drive chain,
and then measure the drive
chain slack as shown.
4. If the drive chain slack is incor-
rect, adjust it as follows.
a
a. Drive chain slack
Drive chain slack:
35–60 mm
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6-26
PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU04369
To adjust the drive chain slack
1. Loosen the brake pedal free play
adjusting nut.
2. Loosen the axle nut.
3. To tighten the drive chain, turn
the adjusting plate on each side
of the swingarm in direction a.
To loosen the drive chain, turn
the adjusting plate on each side
of the swingarm in direction b,
and then push the rear wheel for-
ward.
32
a
b
1
1. Brake pedal free play adjusting nut
2. Axle nut
3. Drive chain adjusting plate
NOTE:
Make sure that both adjusting plates
are in the same position for proper
wheel alignment.
EC000096
cC
Improper drive chain slack will
overload the engine as well as
other vital parts of the motorcycle
and can lead to chain slippage or
breakage. To prevent this from
occurring, keep the drive chain
slack within the specified limits.
4. Tighten the axle nut to the speci-
fied torque.5. Adjust the brake pedal free play.
(See page 6-21 for brake pedal
free play adjustment proce-
dures.)
EW000103
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After adjusting the brake pedal
free play, check the operation of
the brake light.
Tightening torque:
Axle nut:
90 Nm (9.0 m·kgf)
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6-27
PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU01106
Lubricating the drive chain
The drive chain must be cleaned and
lubricated at the intervals specified in
the periodic maintenance and lubrica-
tion chart, otherwise it will quickly
wear out, especially when riding in
dusty or wet areas. Service the drive
chain as follows.
EC000097
cC
The drive chain must be lubricated
after washing the motorcycle or
riding in the rain.
1. Remove all dirt and mud from
the drive chain with a brush or
cloth.
2. Spray a drive chain lubricant on
both sides and on the middle of
the chain, making sure that all
side plates and rollers have been
sufficiently oiled.
NOTE:
For a thorough cleaning, have a
Yamaha dealer remove the drive
chain and soak it in solvent.
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
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6-28
PERIODIC MAINTENANCE AND MINOR REPAIR
6
EW000112
w
Damage to the outer sheath may
interfere with proper cable opera-
tion and will cause the inner cable
to rust. Replace a damaged cable
as soon as possible to prevent
unsafe conditions.
EAU04034
Checking and lubricating the
throttle grip and cable
The operation of the throttle grip
should be checked before each ride.
In addition, the cable should be lubri-
cated or replaced at the intervals
specified in the periodic maintenance
chart.
EAU03370
Checking and lubricating the
brake and shift pedals
The operation of the brake and shift
pedals should be checked before
each ride, and the pedal pivots
should be lubricated if necessary.
Recommended lubricant:
Lithium-soap-based grease
(all-purpose grease)
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6-29
PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU03164
Checking and lubricating the
brake and clutch levers
The operation of the brake and clutch
levers should be checked before
each ride, and the lever pivots should
be lubricated if necessary.
EAU03165
Checking and lubricating the
sidestand
The operation of the sidestand
should be checked before each ride,
and the sidestand pivot and metal-to-
metal contact surfaces should be
lubricated if necessary.
EW000113
w
If the sidestand does not move up
and down smoothly, have a
Yamaha dealer check or repair it.
Recommended lubricant:
Lithium-soap-based grease
(all-purpose grease)
Recommended lubricant:
Lithium-soap-based grease
(all-purpose grease)
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6-30
PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU04282
Lubricating the rear
suspension
The pivoting points of the rear sus-
pension must be lubricated at the
intervals specified in the periodic
maintenance and lubrication chart.
1
1. Grease nipple (×2)
EAU02939
Checking the front fork
The condition and operation of the
front fork must be checked as follows
at the intervals specified in the peri-
odic maintenance and lubrication
chart.
To check the condition
EW000115
w
Securely support the motorcycle
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 motorcycle on a level
surface and hold it in an upright
position.
2. While applying the front brake,
push down hard on the handle-
bars several times to check if the
front fork compresses and
rebounds smoothly.
EC000098
cC
If any damage is found or the front
fork does not operate smoothly,
have a Yamaha dealer check or
repair it.
Recommended lubricant:
Lithium-soap-based grease
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6-31
PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU00794
Checking the steering
Worn or loose steering bearings may
cause danger. Therefore, the opera-
tion of the steering must be checked
as follows at the intervals specified in
the periodic maintenance and lubrica-
tion chart.
1. Place a stand under the engine
to raise the front wheel off the
ground.
EW000115
w
Securely support the motorcycle
so that there is no danger of it
falling over.
2. Hold the lower ends of the front
fork legs and try to move them
forward and backward. If any
free play can be felt, have a
Yamaha dealer check or repair
the steering.
EAU01144
Checking the wheel bearings
The front and rear wheel bearings
must be checked at the intervals
specified in the periodic maintenance
and lubrication chart. If there is play
in the wheel hub or if the wheel does
not turn smoothly, have a Yamaha
dealer check the wheel bearings.
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6-32
PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU00800
Battery
This motorcycle is equipped with a
sealed-type (MF) battery, which does
not require any maintenance. There
is no need to check the electrolyte or
to add distilled water.
EC000101
cC
Never attempt to remove the bat-
tery cell seals, as this would per-
manently damage the battery.
1
1. Battery
EW000116
w
8Electrolyte is poisonous and
dangerous since it contains
sulfuric acid, which causes
severe burns. Avoid any con-
tact with skin, eyes or clothing
and always shield your eyes
when working near batteries.
In case of contact, administer
the following FIRST AID.
9EXTERNAL: Flush with plen-
ty of water.
9INTERNAL: Drink large quan-
tities of water or milk and
immediately call a physi-
cian.
9EYES: Flush with water for
15 minutes and seek prompt
medical attention.8Batteries produce explosive
hydrogen gas. Therefore, keep
sparks, flames, cigarettes,
etc., away from the battery and
provide sufficient ventilation
when charging it in an
enclosed space.
8KEEP THIS AND ALL BATTER-
IES OUT OF THE REACH OF
CHILDREN.
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