2006 YAMAHA YBR125 brake
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PERIODIC MAINTENANCE AND MINOR REPAIR
6-3
6
9*Rear brakeCheck operation and adjust brake pedal free play.√√√√√ √
Replace brake shoes. Whenever worn to the limit
10*Brake hoseCheck for cracks or damage.√√√√ √
Replace. Every 4 years
11*WheelsCheck runout and for damage.√√√√
12*TiresCheck tread depth and for damage.
Replace if necessary.
Check air pressure.
Correct if necessary.√√√√ √
13*Wheel bearingsCheck bearing for looseness or damage.√√√√
14*SwingarmCheck operation and for excessive play.√√√√
Lubricate with lithium-soap-based grease. Every 24000 km
15 Drive chainCheck chain slack, alignment and condition.
Adjust and lubricate chain with a special O-ring chain lu-
bricant thoroughly.Every 1000 km and after washing the motorcycle or
riding in the rain
16*Steering bearingsCheck bearing play and steering for roughness.√√√√√
Lubricate with lithium-soap-based grease. Every 24000 km
17*Chassis fastenersMake sure that all nuts, bolts and screws are properly
tightened.√√√√ √
18 CenterstandCheck operation.
Lubricate.√√√√ √
19*Front forkCheck operation and for oil leakage.√√√√
20*Shock absorber assem-
bliesCheck operation and shock absorbers for oil leakage.√√√√ NO. ITEM CHECK OR MAINTENANCE JOBODOMETER READING (× 1000 km)
ANNUAL
CHECK
1 6 12 18 24
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Page 36 of 84
PERIODIC MAINTENANCE AND MINOR REPAIR
6-4
6
EAU18660
NOTE:
The air filter needs more frequent service if you are riding in unusually wet or dusty areas.
Hydraulic brake service
Regularly check and, if necessary, correct the brake fluid level.
Every two years replace the internal components of the brake master cylinder and caliper, and change the brake fluid.Replace the brake hoses every four years and if cracked or damaged.
21*CarburetorCheck starter (choke) operation.
Adjust engine idling speed.√√√√√ √
22 Engine oilChange.
Check oil level and vehicle for oil leakage.√√√√√ √
23*Front and rear brake
switchesCheck operation.√√√√√ √
24Moving parts and ca-
blesLubricate.√√√√ √
25*Throttle grip housing
and cableCheck operation and free play.
Adjust the throttle cable free play if necessary.
Lubricate the throttle grip housing and cable.√√√√ √
26*Air induction systemCheck the air cut-off valve, reed valve, and hose for dam-
age.
Replace any damaged parts if necessary.√√√√ √
27*Lights, signals and
switchesCheck operation.
Adjust headlight beam.√√√√√ √ NO. ITEM CHECK OR MAINTENANCE JOBODOMETER READING (× 1000 km)
ANNUAL
CHECK
1 6 12 18 24U3D9E0E0.book Page 4 Saturday, December 25, 2004 11:35 AM
Page 48 of 84
PERIODIC MAINTENANCE AND MINOR REPAIR
6-16
6Tire information
This motorcycle is equipped with tube
tires.
WARNING
EWA10460
The front and rear tires should
be of the same make and de-
sign, otherwise the handling
characteristics of the vehicle
cannot be guaranteed.
After extensive tests, only the
tires listed below have been ap-
proved for this model byYamaha Motor Co., Ltd.
WARNING
EWA10570
Have a Yamaha dealer replace
excessively worn tires. Besides
being illegal, operating the
motorcycle with excessively
worn tires decreases riding sta-
bility and can lead to loss of
control.
The replacement of all wheel-
and brake-related parts, includ-
ing the tires, should be left to a
Yamaha dealer, who has the
necessary professional knowl-
edge and experience.
It is not recommended to patch
a punctured tube. If unavoid-
able, however, patch the tube
very carefully and replace it as
soon as possible with a high-quality product.
EAU22000
Cast wheels
WARNING
EWA10610
The wheels on this model are not de-
signed for use with tubeless tires.
Do not attempt to use tubeless tireson this model.
To maximize the performance, durabil-
ity, and safe operation of your motor-
cycle, note the following points
regarding the specified wheels.
The wheel rims should be checked
for cracks, bends, warpage or
damage 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 han-
dling characteristics, and a short-
ened tire life.
Front tire:
Size:
2.75-18 42P
Manufacturer/model:
CHENG SHIN/SAKURA S-901
PIRELLI/CITY DEMON
Rear tire:
Size:
90/90-18 57P
Manufacturer/model:
CHENG SHIN/SAKURA S-180
PIRELLI/CITY DEMON
U3D9E0E0.book Page 16 Saturday, December 25, 2004 11:35 AM
Page 50 of 84
PERIODIC MAINTENANCE AND MINOR REPAIR
6-18
65. To increase the clutch lever free
play, turn the adjusting nut in direc-
tion (a). To decrease the clutch le-
ver free play, turn the adjusting nut
in direction (b).
6. Tighten the locknut at the clutch le-
ver and the crankcase.
EAUT1220
Checking the front brake lever
free play The brake lever free play should mea-
sure 0.0–7.0 mm (0.00–0.28 in) as
shown. Periodically check the brake le-
ver free play and, if necessary, have a
Yamaha dealer check the brake sys-
tem.
WARNING
EWA10640
An incorrect brake lever free play in-
dicates a hazardous condition in the
brake system. Do not operate the
motorcycle until the brake system
has been checked or repaired by aYamaha dealer.
EAU22181
Adjusting the brake pedal free
play The brake pedal free play should mea-
sure 20.0–30.0 mm (0.79–1.18 in) at
the brake pedal end as shown. Period-
ically check the brake pedal free play
and, if necessary, adjust it as follows.
To increase the brake pedal free play,
turn the adjusting nut in direction (a). To
decrease the brake pedal free play,
turn the adjusting nut in direction (b).
1. Brake lever free play
1. Brake pedal free play
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Page 51 of 84
PERIODIC MAINTENANCE AND MINOR REPAIR
6-19
6
WARNING
EWA10680
After adjusting the drive chain
slack or removing and installing
the rear wheel, always check the
brake pedal free play.
If proper adjustment cannot be
obtained as described, have a
Yamaha dealer make this ad-
justment.
After adjusting the brake pedal
free play, check the operation ofthe brake light.
EAU22291
Adjusting the rear brake light
switch The rear brake light switch, which is ac-
tivated by the brake pedal, is properly
adjusted when the brake light comes
on just before braking takes effect. If
necessary, adjust the brake light switch
as follows.
1. Remove panel A. (See page 6-5.)
2. Turn the adjusting nut while hold-
ing the rear brake light switch in
place. To make the brake light
come on earlier, turn the adjusting
nut in direction (a). To make the
brake light come on later, turn the
adjusting nut in direction (b).3. Install the panel.
1. Brake pedal free play adjusting nut
1. Rear brake light switch
2. Rear brake light switch adjusting nut
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Page 52 of 84
PERIODIC MAINTENANCE AND MINOR REPAIR
6-20
6
EAU22380
Checking the front brake pads
and rear brake shoes The front brake pads and the rear brake
shoes must be checked for wear at the
intervals specified in the periodic main-
tenance and lubrication chart.
EAU37060
Front brake pads
The front brake is provided with a check
plug, which, if it is removed, allows you
to check the brake pad wear without
disassembling the brake. To check the
brake pad wear, check the position of
the wear indicator while applying the
brake. If a brake pad has worn to thepoint that the wear indicator almost
touches the brake disc, have a Yamaha
dealer replace the brake pads as a set.
EAU22540
Rear brake shoes
The rear brake is provided with a wear
indicator, which allows you to check the
brake shoe wear without having to dis-
assemble 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
dealer replace the brake shoes as a
set.
EAU37000
Checking the front brake fluid
level Insufficient brake fluid may allow air to
enter the brake system, possibly caus-
ing 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 fluid level is low, be sure to check
the brake pads for wear and the brake
system for leakage.
Observe these precautions:
1. Brake pad wear indicator
1. Brake shoe wear limit line
2. Brake shoe wear indicator
1. Minimum level mark
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Page 53 of 84
PERIODIC MAINTENANCE AND MINOR REPAIR
6-21
6
When checking the fluid level,
make sure that the top of the mas-
ter 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.
NOTE:If DOT 4 is not available, DOT 3 can beused for the front brake system.
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 refill-
ing. Water will significantly lower
the boiling point of the fluid and
may result in vapor lock.
Brake fluid may deteriorate paint-
ed surfaces or plastic parts. Al-
ways clean up spilled fluid
immediately.
As the brake pads wear, it is nor-
mal for the brake fluid level to grad-
ually go down. However, if the
brake fluid level goes down sud-
denly, have a Yamaha dealer
check the cause.
EAU22720
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 addition,
have the oil seals of the brake master
cylinder and caliper as well as the
brake hose replaced at the intervals
listed below or whenever they are dam-
aged or leaking.
Oil seals: Replace every two
years.
Brake hose: Replace every four
years.
Recommended brake fluid:
DOT 4
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Page 54 of 84
PERIODIC MAINTENANCE AND MINOR REPAIR
6-22
6
EAU22760
Drive chain slack The drive chain slack should be
checked before each ride and adjusted
if necessary.
EAU22791
To check the drive chain slack
1. Place the motorcycle on the cen-
terstand.
2. Shift the transmission into the neu-
tral position.
3. Spin the rear wheel several times
to locate the tightest portion of the
drive chain.
4. Measure the drive chain slack as
shown.5. If the drive chain slack is incorrect,
adjust it as follows.
EAU37111
To adjust the drive chain slack
1. Loosen the brake pedal free play
adjusting nut, brake torque rod nut,
and axle nut.
2. Loosen the chain puller locknut at
each end of the swingarm.3. To tighten the drive chain, turn the
adjusting bolt at each end of the
swingarm in direction (a). To loos-
en the drive chain, turn the adjust-
ing bolt at each end of the
swingarm in direction (b), and then
push the rear wheel forward.
NOTE:Using the alignment marks on each
side of the swingarm, make sure that
both chain pullers are in the same posi-tion for proper wheel alignment.
1. Drive chain slack
Drive chain slack:
20.0–30.0 mm (0.79–1.18 in)1. Drive chain slack adjusting bolt
2. Chain puller locknut
3. Axle nut
4. Brake torque rod nut
5. Brake pedal free play adjusting nut
1. Alignment marks
2. Chain puller locknut
3. Drive chain slack adjusting bolt
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