YAMAHA YBR250 2011 Service Manual

PERIODIC MAINTENANCE AND ADJUSTMENT
6-8
6 3. Remove the spark plug as shown,
with the spark plug wrench includ-
ed in the owner’s tool kit.
To check the spark plug
1. Check that the porcelain insulator
around the center electrode of the
spark plug is a medium-to-light tan
(the ideal color when the vehicle is
ridden normally).
TIPIf the spark plug shows a distinctly dif-
ferent color, the engine could be oper-
ating improperly. Do not attempt to
diagnose such problems yourself. In-
stead, have a Yamaha dealer checkthe vehicle.2. Check the spark plug for electrode
erosion and excessive carbon or
other deposits, and replace it if
necessary.
To install the spark plug
1. Measure the spark plug gap with a
wire thickness gauge and, if nec-
essary, adjust the gap to specifica-
tion.2. Clean the surface of the spark plug
gasket and its mating surface, and
then wipe off any grime from the
spark plug threads.
3. Install the spark plug with the
spark plug wrench, and then tight-
en it to the specified torque.
TIPIf 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 speci-fied torque as soon as possible.
4. Install the spark plug cap.
5. Install the cowling.
1. Spark plug wrench
Specified spark plug:
NGK/DR8EA
1. Spark plug gap
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
Tightening torque:
Spark plug:
17.5 Nm (1.75 m·kgf, 13 ft·lbf)
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-9
6
EAU37804
Engine oil and oil filter ele-
ment The engine oil level should be checked
before each ride. In addition, the oil
must be changed and the oil filter ele-
ment replaced at the intervals specified
in the General periodic maintenance
and lubrication chart.
To check the engine oil level
1. Place the vehicle on a level sur-
face and hold it in an upright posi-
tion. A slight tilt to the side can
result in a false reading.
2. Start the engine, warm it up for
several minutes, and then turn it
off.
3. Wait a few minutes until the oil set-
tles, and then check the oil level
through the check window located
at the bottom-right side of the
crankcase.TIPThe engine oil should be between theminimum and maximum level marks.4. If the engine oil is below the mini-
mum level mark, add sufficient oil
of the recommended type to raise
it to the correct level.
To change the engine oil (with or
without oil filter element replace-
ment)
1. Place the vehicle on a level sur-
face.
2. Start the engine, warm it up for
several minutes, and then turn it
off.
3. Place an oil pan under the engine
to collect the used oil.4. Remove the engine oil filler bolt
and drain bolt to drain the oil from
the crankcase.
TIPCheck the washer for damage and re-place it if necessary.
1. Engine oil filler cap
2. Maximum level mark
3. Minimum level mark
1. Dipstick
1. Engine oil drain bolt
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-10
6 5. Remove the oil filter element drain
bolt to drain the oil from the oil filter
element.
TIPSkip steps 6–8 if the oil filter element isnot being replaced.
6. Remove the oil filter element cover
by removing the bolts.7. Remove and replace the oil filter
element and O-rings.
TIPMake sure that the O-rings are properlyseated.
8. Install the oil filter element cover by
installing the bolts, then tightening
them to the specified torque.
9. Install the engine oil drain bolt, and
then tighten it to the specified
torque.10. Install the oil filter element drain
bolt, and then tighten it to the spec-
ified torque.
11. Refill with the specified amount of
the recommended engine oil, and
then install and tighten the oil filler
bolt.
TIPBe sure to wipe off spilled oil on any
parts after the engine and exhaust sys-tem have cooled down.
1. Oil filter element cover bolt
2. Oil filter element drain bolt
1. Oil filter element
2. O-ring
Tightening torque:
Oil filter element cover bolt:
10 Nm (1.0 m·kgf, 7.4 ft·lbf)
Tightening torques:
Engine oil drain bolt:
20 Nm (2.0 m·kgf, 15 ft·lbf)
Oil filter element drain bolt:
7 Nm (0.7 m·kgf, 5.25 ft·lbf)
Recommended oil:
See page 8-1.
Oil quantity:
Without oil filter element replace-
ment:
1.35 L (1.43 US qt, 1.19 Imp.qt)
With oil filter element replacement:
1.45 L (1.53 US qt, 1.28 Imp.qt)
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-11
6
NOTICE
ECA11620


In order to prevent clutch slip-
page (since the engine oil also
lubricates the clutch), do not
mix any chemical additives. Do
not use oils with a diesel speci-
fication of “CD” or oils of a high-
er quality than specified. In
addition, do not use oils labeled
“ENERGY CONSERVING II” or
higher.


Make sure that no foreign mate-rial enters the crankcase.
12. Start the engine, and then let it idle
for several minutes while checking
it for oil leakage. If oil is leaking, im-
mediately turn the engine off and
check for the cause.
13. Turn the engine off, and then
check the oil level and correct it if
necessary.
EAU20881
Cleaning the air filter element The air filter should be cleaned at the
specified intervals. It should be cleaned
more frequently when riding in unusual-
ly wet or dusty areas.
1. Remove panel B. (See page 6-6.)
2. Remove the air filter case by re-
moving the screws.
3. Remove the air filter from the case.4. Remove the air filter element from
its guide and clean it with solvent.
After cleaning, remove the remain-
ing solvent by squeezing the ele-
ment.1. Air filter case cover
2. Screw
1. Air filter element
1
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-12
6 5. Apply recommended oil to the en-
tire surface of the element and
squeeze out the excess oil. It
should be wet but not dripping.
6. Insert the air filter element guide
into the air filter and install it in the
case. NOTICE: Make sure that
the air filter element is properly
seated in the air filter case. The
engine should never be operat-
ed without the air filter element
installed, otherwise the pis-
ton(s) and/or cylinder(s) may
become excessively worn.
[ECA10481]
7. Install the air filter case cover and
panel by installing the screws.
EAU34301
Adjusting the engine idling
speed The engine idling speed must be
checked and, if necessary, adjusted as
follows at the intervals specified in the
periodic maintenance and lubrication
chart.
The engine should be warm before
making this adjustment.
Check the engine idling speed and, if
necessary, adjust it to specification by
turning the idle adjusting screw. To in-
crease the engine idling speed, turn the
screw in direction (a). To decrease the
engine idling speed, turn the screw in
direction (b).TIPIf the specified idling speed cannot be
obtained as described above, have aYamaha dealer make the adjustment.
EAU21382
Checking the throttle cable
free play The throttle cable free play should mea-
sure 3.0–5.0 mm (0.12–0.20 in) at the
throttle grip. Periodically check the
throttle cable free play and, if neces-
sary, have a Yamaha dealer adjust it.
Recommended oil:
Engine oil
Engine idling speed:
1300–1500 r/min
1. Throttle cable free play
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-13
6
EAU21401
Valve clearance The valve clearance changes with use,
resulting in improper air-fuel mixture
and/or engine noise. To prevent this
from occurring, the valve clearance
must be adjusted by a Yamaha dealer
at the intervals specified in the periodic
maintenance and lubrication chart.
EAU21562
Tires To maximize the performance, durabil-
ity, and safe operation of your motor-
cycle, 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.
WARNING
EWA10501
Operation of this vehicle with im-
proper tire pressure may cause se-
vere injury or death from loss of
control.

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 ad-
justed in accordance with the
riding speed and with the total
weight of rider, passenger, car-
go, and accessories approvedfor this model.
WARNING
EWA10511
Never overload your vehicle. Opera-
tion of an overloaded vehicle couldcause an accident.Tire air pressure (measured on cold
tires):
0–90 kg (0–198 lb):
Front:
225 kPa (2.25 kgf/cm², 33 psi)
Rear:
250 kPa (2.50 kgf/cm², 36 psi)
90–167 kg (198–368 lb):
Front:
225 kPa (2.25 kgf/cm², 33 psi)
Rear:
250 kPa (2.50 kgf/cm², 36 psi)
Maximum load*:
167 kg (368 lb)
* Total weight of rider, passenger, car-
go and accessories
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-14
6 Tire inspection
The tires must be checked before each
ride. If the center tread depth reaches
the specified limit, if the tire has a nail or
glass fragments in it, or if the sidewall is
cracked, have a Yamaha dealer re-
place the tire immediately.
TIPThe tire tread depth limits may differ
from country to country. Always complywith the local regulations.Tire information
This motorcycle is equipped with cast
wheels and tubeless tires.
WARNING
EWA10461
The front and rear tires should be of
the same make and design, other-
wise the handling characteristics of
the vehicle may be different, whichcould lead to an accident.
After extensive tests, only the tires list-
ed below have been approved for this
model by Yamaha Motor Co., Ltd.
WARNING
EWA10470


Have a Yamaha dealer replace
excessively worn tires. Besides
being illegal, operating the vehi-cle with excessively worn tires
decreases riding stability 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.
1. Tire sidewall
2. Tire tread depthMinimum tire tread depth (front and
rear):
1.6 mm (0.06 in)
Front tire:
Size:
100/80-17M/C 52S
Manufacturer/model:
PIRELLI/SPORT DEMON
Rear tire:
Size:
130/70-17M/C 62S
Manufacturer/model:
PIRELLI/SPORT DEMON
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-15
6
EAU21960
Cast wheels To maximize the performance, durabil-
ity, and safe operation of your vehicle,
note the following points regarding the
specified wheels.

The wheel rims should be checked
for cracks, bends or warpage be-
fore each ride. If any damage is
found, have a Yamaha dealer re-
place 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.


Ride at moderate speeds after
changing a tire since the tire sur-
face must first be “broken in” for it
to develop its optimal characteris-
tics.
EAU22020
Adjusting the clutch lever free
play The clutch lever free play should mea-
sure 10.0–15.0 mm (0.39–0.59 in) as
shown. Periodically check the clutch le-
ver free play and, if necessary, adjust it
as follows.
1. Loosen the locknut at the clutch le-
ver.
2. To increase the clutch lever free
play, turn the adjusting bolt in di-
rection (a). To decrease the clutch
lever free play, turn the adjusting
bolt in direction (b).
3. Tighten the locknut.
TIPIf the specified free play cannot be ob-
tained as described above or if the
clutch does not operate correctly, have
a Yamaha dealer check the internalclutch mechanism.
1. Locknut
2. Clutch lever free play adjusting bolt
3. Clutch lever free play
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-16
6
EAU22192
Adjusting the brake pedal po-
sition and free play
WARNING
EWA10670
It is advisable to have a Yamahadealer make these adjustments.
Brake pedal position
The top of the brake pedal should be
positioned approximately 29.0 mm
(1.14 in) below the top of the footrest.
Periodically check the brake pedal po-
sition and, if necessary, adjust it as fol-
lows.
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 ad-
justing bolt in direction (b).
3. Tighten the locknut.
WARNING
EWA11230
After adjusting the brake pedal posi-
tion, the brake pedal free play mustbe adjusted.
Brake pedal free play
The brake pedal free play should mea-
sure 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 brake
pedal free play, turn the adjusting nut in
direction (b).
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.
1. Brake pedal position
2. Brake pedal free play
1. Adjusting bolt
2. Locknut
1
2
(b)
(a)
1. Adjusting nut
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-17
6


After adjusting the brake pedal
free play, check the operation ofthe brake light.
EAU22272
Adjusting the rear brake light
switch The rear brake light, which is activated
by the brake pedal, should come on just
before braking takes effect. If neces-
sary, adjust the rear brake light switch
as follows.
Turn the rear brake light switch adjust-
ing 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 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.
EAU22430
Front brake pads
Each front brake pad is provided with
wear indicator grooves, which allow
you to check the brake pad wear with-
out 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
1. Rear brake light switch
2. Rear brake light switch adjusting nut
1. Brake pad wear indicator
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