2007 YAMAHA YBR250 Owners Manual

6-16
6
PERIODIC MAINTENANCE AND MINOR REPAIR
EAU22192
Adjusting the brake pedal
position and free play
EWA10670
It is advisable to have a Yamaha dealer
make these adjustments.Brake pedal position
The top of the brake pedal should be
positioned approximately 29 mm
(1.14 in) below the top of the footrest.
Periodically check the brake pedal
position and, if necessary, adjust it as
follows.1. Loosen the locknut at the brake pedal.
2. To raise the brake pedal, turn the adjusting bolt in direction (a). To
lower the brake pedal, turn the
adjusting bolt in direction (b).
3. Tighten the locknut.
EWA11230
After adjusting the brake pedal
position, the brake pedal free play
must be adjusted.
A. Pedal height
B. Brake pedal free play
1 2
1. Adjusting bolt
2. LocknutBrake pedal free play
The brake pedal free play should
measure 15.0 - 20.0 mm (0.59 - 0.79 in)
as shown. Periodically check the brake
pedal free play and, if necessary, adjust
it as follows.
To increase the brake pedal free play, turn the adjusting nut at the brake rod in
direction (a). To decrease the b
rake pedal
free play, turn the adjusting nut in
direction (b).
1. Adjusting nut
EWA10680
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After adjusting the drive chain
slack or removing and installing
the rear wheel, always check the
brake pedal free play.
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If proper adjustment cannot be
obtained as described, have a
Yamaha dealer make this
adjustment.
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After adjusting the brake pedal
free play, check the operation of
the brake light.
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6-17
6
PERIODIC MAINTENANCE AND MINOR REPAIR
EAU22270
Adjusting the rear brake light
switch1. Rear brake light switch
2. Rear brake light switch adjusting nutThe rear brake light switch, which is
activated 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.
Turn the adjusting nut while holding 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).
EAU22380
Checking the front brake
pads and rear brake shoesThe front brake pads and the rear brake
shoes must be checked for wear at the
intervals specified in the periodic
maintenance and lubrication chart.
EAU22430
Front brake pads
11
1. Brake pad wear indicatorEach front brake pad is provided with
wear indicator grooves, which allow you
to check the brake pad wear without
having to disassemble the brake. To
check the brake pad wear, check the
wear indicator grooves. If a brake pad
has worn to the point that the wear
indicator grooves have almost
disappeared, have a Yamaha dealer
replace the brake pads as a set.
EAU22540
Rear brake shoes
1 2
1. Wear limit line
2. Brake shoe wear indicatorThe 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 dealer
replace the brake shoes as a set.
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6-18
6
PERIODIC MAINTENANCE AND MINOR REPAIR
EAU37001
Checking the front brake
fluid level
LOWERLOWER
UP
1
1. Minimum level markInsufficient 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
fluid level is low, be sure to check the
brake pads for wear and the brake
system for leakage.
Observe these precautions:l
When checking the fluid level, make
sure that the top of the master
cylinder is level by turning the
handlebars.
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Use only the recommended quality
brake fluid, otherwise the rubber
seals may deteriorate, causing
leakage and poor braking
performance.Recommended brake fluid: DOT 4
If DOT 4 is not available, DOT 3 can be
used.l
Refill with the same type of brake
fluid. Mixing fluids may result in a
harmful chemical reaction and lead
to poor braking performance.
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Be careful that water does not enter
the master cylinder when refilling.
Water will significantly lower the
boiling point of the fluid and may
result in vapor lock.
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Brake fluid may deteriorate painted
surfaces or plastic parts. Always
clean up spilled fluid immediately.
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As the brake pads wear, it is normal
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.
EAU22720
Changing the brake fluidHave a Yamaha dealer change the brake
fluid at the intervals specified in the
NOTE after the periodic maintenance
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 damaged or leaking.l
Oil seals: Replace every two years.
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Brake hose: Replace every four
years.
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6-19
6
PERIODIC MAINTENANCE AND MINOR REPAIR
EAU22760
Drive chain slackThe drive chain slack should be checked
before each ride and adjusted if
necessary.
EAU22772
To check the drive chain slack
1
1. Drive chain slack1. Place the motorcycle on thesidestand.When checking and adjusting the drive
chain slack, there should be no weight
on the motorcycle.2. Shift the transmission into theneutral position.
3. Move the rear wheel by pushing the motorcycle to locate the tightest portion of the drive chain,
and then measure the drive chain
slack as shown.
Drive chain slack:
25.0 - 35.0 mm (0.98 - 1.38 in)4. If the drive chain slack is incorrect,
adjust it as follows.
EAU22821
To adjust the drive chain slack1. Axle nut
2. Drive chain slack adjusting nut
3. Locknut
4. Alignment marks1. Loosen the brake pedal free playadjusting nut, axle nut, and locknut
at each end of the swingarm.
2. To tighten the drive chain, turn the adjusting nut at each end of the swingarm in direction (a). To loosen
the drive chain, turn the adjusting
nut at each end of the swingarm in
direction (b), and then push the rear
wheel forward.
Using the alignment marks on each side
of the swingarm, make sure that both
adjusting nuts are in the same position
for proper wheel alignment.
ECA10570
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.3. Tighten both locknuts and the axle
nut to the specified torques.
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6-20
6
PERIODIC MAINTENANCE AND MINOR REPAIRTightening torques:Locknut:
16 Nm (1.6 m.kgf, 12 ft.lbt)
Axle nut: 104 Nm (10.4 m.kgf, 77 ft.lbt)4. Adjust the brake pedal free play.
(See page 6-16.)
EWA10660
After adjusting the brake pedal free
play, check the operation of the brake
light.
EAU23022
Cleaning and lubricating the
drive chainThe drive chain must be cleaned and
lubricated at the intervals specified in
the periodic maintenance and lubrication
chart, otherwise it will quickly wear out,
especially when riding in dusty or wet
areas. Service the drive chain as follows.
ECA10581
The drive chain must be lubricated
after washing the motorcycle and
riding in the rain.1. Clean the drive chain with keroseneand a small soft brush.
ECA11120
To prevent damaging the O-rings, do
not clean the drive chain with steam
cleaners, high-pressure washers or
inappropriate solvents.2. Wipe the drive chain dry.
3. Thoroughly lubricate the drive chain with a special O-ring chain
lubricant.
ECA11110
Do not use engine oil or any other
lubricants for the drive chain, as they
may contain substances that could
damage the O-rings.
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6-21
6
PERIODIC MAINTENANCE AND MINOR REPAIR
EAU23100
Checking and lubricating the
cablesThe 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
EWA10720
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.
EAU23111
Checking and lubricating the
throttle grip and cableThe operation of the throttle grip should
be checked before each ride. In addition,
the cable should be lubricated at the
intervals specified in the periodic
maintenance chart.
EAU23140
Checking and lubricating the
brake and clutch levers
1
2
1. Brake lever
2. Lubrication point1. Clutch lever
2. Lubrication pointThe operation of the brake and clutch
levers should be checked before each
ride, and the lever pivots should be
lubricated if necessary.
cap 6.pmd 18/4/2007, 14:35
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6-22
6
PERIODIC MAINTENANCE AND MINOR REPAIRRecommended lubricant:Lithium-soap-based grease (all-
purpose grease)
EAU23131
Checking and lubricating the
brake and shift pedals
2
1
1. Brake pedal
2. Lubrication points
2
1. Shift pedal
2. Lubrication pointsThe 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)
EAU23200
Checking and lubricating the
sidestandThe 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.
EWA10730
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)
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6-23
6
PERIODIC MAINTENANCE AND MINOR REPAIR
EAU23250
Lubricating the rear
suspensionThe pivoting points of the rear
suspension must be lubricated at the
intervals specified in the periodic
maintenance and lubrication chart.Recommended lubricant:
Lithium-soap-based grease
(all-purpose grease)
EAU23271
Checking the front forkThe condition and operation of the front
fork must be checked as follows at the
intervals specified in the periodic
maintenance and lubrication chart.
To check the condition
EWA10750
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 operation1. 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 handlebars
several times to check if the front
fork compresses and rebounds
smoothly.
ECA10590
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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