2014 YAMAHA YBR125 check engine light

TABLE OF CONTENTSSAFETY INFORMATION.................. 1-1
DESCRIPTION .................................. 2-1
Left view ......................................... 2-1
Right view ....................................... 2-2
Controls and instruments ............... 2-3
INSTRUMENT AND CONTROL
FUNCTIONS ...................................... 3-1
Main switch/steering lock............... 3-1
Indicator lights and warning light ... 3-2
Speedometer unit ........................... 3-3
Tachometer .................................... 3-3
Self-diagnosis device ..................... 3-3
Fuel gauge ...................................... 3-4
Handlebar switches ........................ 3-4
Clutch lever .................................... 3-5
Shift pedal ...................................... 3-5
Brake lever...................................... 3-5
Brake pedal .................................... 3-6
Fuel tank cap .................................. 3-6
Fuel ................................................. 3-7
Catalytic converters........................ 3-8
Kickstarter ...................................... 3-9
Adjusting the shock absorber assemblies .................................. 3-9
Carrier ........................................... 3-10
Sidestand ..................................... 3-10
Ignition circuit cut-off system ....... 3-11 FOR YOUR SAFETY –
PRE-OPERATION CHECKS
............. 4-1
OPERATION AND IMPORTANT
RIDING POINTS ................................ 5-1
Starting the engine .......................... 5-1
Shifting ............................................ 5-2
Tips for reducing fuel consumption ................................ 5-3
Engine break-in ............................... 5-3
Parking ............................................ 5-4
PERIODIC MAINTENANCE AND
ADJUSTMENT ................................... 6-1
Owner’s tool kit ............................... 6-2
Periodic maintenance chart for the emission control system .............. 6-3
General maintenance and lubrication chart ........................... 6-4
Removing and installing panels ...... 6-7
Checking the spark plug ................. 6-8
Engine oil....................................... 6-10
Cleaning the air filter element ....... 6-11
Checking the engine idling
speed ......................................... 6-13
Checking the throttle grip free
play ............................................ 6-13
Valve clearance ............................. 6-14
Tires .............................................. 6-14
Cast wheels................................... 6-16 Adjusting the clutch lever free
play ............................................ 6-16
Checking the brake lever free play ............................................ 6-17
Adjusting the brake pedal free
play ............................................ 6-18
Checking the shift pedal ............... 6-18
Brake light switches ..................... 6-19
Checking the front brake pads and rear brake shoes ............... 6-19
Checking the brake fluid level ...... 6-20
Changing the brake fluid .............. 6-21
Drive chain slack........................... 6-21
Cleaning and lubricating the drive
chain.......................................... 6-23
Checking and lubricating the cables ........................................ 6-24
Checking and lubricating the throttle grip and cable ............... 6-24
Checking and lubricating the
brake and clutch levers ............. 6-24
Checking and lubricating the brake pedal ............................... 6-25
Checking and lubricating the centerstand and sidestand........ 6-25
Lubricating the swingarm
pivots......................................... 6-26
Checking the front fork ................. 6-26
Checking the steering................... 6-27
Checking the wheel bearings ....... 6-27
Battery .......................................... 6-28U51DE1E0.book Page 1 Thursday, August 29, 2013 4:41 PM

SAFETY INFORMATION
1-5
1operator and may limit control
ability, therefore, such accesso-
ries are not recommended.
 Use caution when adding electri-
cal accessories. If electrical ac-
cessories exceed the capacity of
the motorcycle’s electrical sys-
tem, an electric failure could re-
sult, which could cause a
dangerous loss of lights or engine
power.
Aftermarket Tires an d Rims
The tires and rims that came with your
motorcycle were designed to match
the performance capabilities and to
provide the best combination of han-
dling, braking, and comfort. Other
tires, rims, sizes, and combinations
may not be appropriate. Refer to page
6-14 for tire specifications and more in-
formation on replacing your tires.
Transportin g the Motorcycle
Be sure to observe following instruc-
tions before transporting the motorcy-
cle in another vehicle.  Remove all loose items from the
motorcycle. 
Check that the fuel cock (if
equipped) is in the “OFF” position
and that there are no fuel leaks.
 Point the front wheel straight
ahead on the trailer or in the truck
bed, and choke it in a rail to pre-
vent movement.
 Shift the transmission in gear (for
models with a manual transmis-
sion).
 Secure the motorcycle with tie-
downs or suitable straps that are
attached to solid parts of the mo-
torcycle, such as the frame or up-
per front fork triple clamp (and not,
for example, to rubber-mounted
handlebars or turn signals, or
parts that could break). Choose
the location for the straps carefully
so the straps will not rub against
painted surfaces during transport.
 The suspension should be com-
pressed somewhat by the tie-
downs, if possible, so that the mo-
torcycle will not bounce exces-
sively during transport.
U51DE1E0.book Page 5 Thursday, August 29, 2013 4:41 PM

INSTRUMENT AND CONTROL FUNCTIONS
3-2
3
To unlock the steering
Insert the key and turn it to “OFF”.
EAU11008
In
dicator li ghts an d warnin g
lig ht
EAU11031
Turn si gnal in dicator li ghts “ ”
an d“”
The corresponding indicator light
flashes when the turn signal switch is
pushed to the left or right.
EAU11061
Neutral in dicator li ght “ ”
This indicator light comes on when the
transmission is in the neutral position.
EAU11081
Hi gh beam in dicator li ght “ ”
This indicator light comes on when the
high beam of the headlight is switched
on.
EAU11506
En gine trou ble warnin g li ght “ ”
This warning light comes on or flashes
if a problem is detected in the electrical
circuit monitoring the engine. If this oc-
curs, have a Yamaha dealer check the
self-diagnosis system. (See page 3-3
for an explanation of the self-diagnosis
device.)
The electrical circuit of the warning
light can be checked by turning the key
to “ON”. The warning light should
come on for a few seconds, and then
go off.
If the warning light does not come on
initially when the key is turned to “ON”,
or if the warning light remains on, have
a Yamaha dealer check the electrical
circuit.
1. Turn.
LOCKOFF
1
1. Left turn signal indicator light “ ”
2. Neutral indicator light “ ”
3. Engine trouble warning light “ ”
4. High beam indicator light “ ”
5. Right turn signal indicator light “ ”
5
4
3
2
1
U51DE1E0.book Page 2 Thursday, August 29, 2013 4:41 PM

INSTRUMENT AND CONTROL FUNCTIONS
3-3
3
EAU11631
Speedometer unitThe speedometer unit is equipped with
a speedometer, an odometer and a
tripmeter. The speedometer shows rid-
ing speed. The odometer shows the
total distance traveled. The tripmeter
shows the distance traveled since it
was last set to zero with the reset knob.
The tripmeter can be used to estimate
the distance that can be traveled with a
full tank of fuel. This information will en-
able you to plan future fuel stops.
EAU11852
TachometerThe electric tachometer allows the rid-
er to monitor the engine speed and
keep it within the ideal power range.NOTICE
ECA10032
Do not operate the en gine in the ta-
chometer red zone.
Re d zone: 10000 r/min an d a bove
EAU12095
Self- dia gnosis deviceThis model is equipped with a self-di-
agnosis device for various electrical
circuits.
If a problem is detected in any of those
circuits, the engine trouble warning
light will come on or flash. If this oc-
curs, have a Yamaha dealer check the
vehicle.NOTICE
ECA11171
To prevent en gine damag e, be sure
to consult a Yamaha dealer as soon
as possi ble if this occurs.
1. Speedometer
2. Odometer
3. Tripmeter
4. Tripmeter reset knob
km/h
1234
1. Tachometer
2. Tachometer red zone
x 1000 r/min
1
2
U51DE1E0.book Page 3 Thursday, August 29, 2013 4:41 PM

OPERATION AND IMPORTANT RIDING POINTS
5-1
5
EAU15952
Read the Owner’s Manual carefully to
become familiar with all controls. If
there is a control or function you do not
understand, ask your Yamaha dealer.
WARNING
EWA10272
Failure to familiarize yourself with
the controls can lead to loss of con-
trol, which coul d cause an acci dent
or injury.
EAU45311
TIPThis model is equipped with a lean an-
gle sensor to stop the engine in case of
a turnover. To start the engine after a
turnover, be sure to turn the main
switch to “OFF” and then to “ON”. Fail-
ing to do so will prevent the engine
from starting even though the engine
will crank when pushing the start
switch.
EAU43187
Startin g the en gineIn order for the ignition circuit cut-off
system to enable starting, one of the
following conditions must be met:
 The transmission is in the neutral
position.
 The transmission is in gear with
the clutch lever pulled and the
sidestand up.
See page 3-11 for more informa-
tion.
1. Turn the key to “ON”. The engine trouble warning light
should come on for a few sec-
onds, then go off.NOTICE
ECA16712
If the warnin g li ght does not come
on initially when the key is turne d to
“ON”, or if the warnin g li ght remains
on, see pa ge 3-2 for the warnin g
li g ht circuit check.2. Shift the transmission into the
neutral position. The neutral indi-
cator light should come on. If not,
ask a Yamaha dealer to check the
electrical circuit.
U51DE1E0.book Page 1 Thursday, August 29, 2013 4:41 PM

OPERATION AND IMPORTANT RIDING POINTS
5-3
5
EAU16811
Tips for reducin g fuel con-
sumptionFuel consumption depends largely on
your riding style. Consider the follow-
ing tips to reduce fuel consumption:
 Shift up swiftly, and avoid high en-
gine speeds during acceleration.
 Do not rev the engine while shift-
ing down, and avoid high engine
speeds with no load on the en-
gine.
 Turn the engine off instead of let-
ting it idle for an extended length
of time (e.g., in traffic jams, at traf-
fic lights or at railroad crossings).
EAU16831
Engine break-inThere is never a more important period
in the life of your engine than the period
between 0 and 1000 km (600 mi). For
this reason, you should read the fol-
lowing material carefully.
Since the engine is brand new, do not
put an excessive load on it for the first
1000 km (600 mi). The various parts in
the engine wear and polish themselves
to the correct operating clearances.
During this period, prolonged full-throt-
tle operation or any condition that
might result in engine overheating
must be avoided.
EAU49211
0–150 km (0–90 mi)
Avoid prolonged operation above 5000
r/min.
After every hour of operation, stop the
engine, and then let it cool for five to
ten minutes.
Vary the engine speed from time to
time. Do not operate the engine at one
set throttle position. 150–500 km (90–300 mi)
Avoid prolonged operation above 6000
r/min.
Rev the engine freely through the
gears, but do not use full throttle at any
time.
500–1000 km (300–600 mi)
Avoid prolonged full-throttle operation.
Avoid prolonged operation above 7500
r/min.
NOTICE: After 1000 km (600
mi) of operation, the en gine oil must
b e chan ged .
[ECA10282]
1000 km (600 mi) an d b eyon d
The vehicle can now be operated nor-
mally.NOTICE
ECA10311
 Keep the en gine spee d out of
the tachometer red zone.
 If any en gine trou ble shoul d oc-
cur during the en gine break-in
period , imme diately have a
Yamaha dealer check the vehi-
cle.
U51DE1E0.book Page 3 Thursday, August 29, 2013 4:41 PM

PERIODIC MAINTENANCE AND ADJUSTMENT
6-9
6To check the spark plu
g
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 vehi-
cle 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 check
the vehicle.
2. Check the spark plug for electrodeerosion and excessive carbon or
other deposits, and replace it if
necessary.
3. Measure the spark plug gap with a wire thickness gauge and, if nec-
essary, adjust the gap to specifi-
cation. To install the spark plu
g
1. Clean the surface of the spark plug gasket and its mating surfa-
ce, and then wipe off any grime
from the spark plug threads.
2. 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
specified torque as soon as possible.3. Install the spark plug cap.
1. Spark plug wrench
Specifie d spark plu g:
NGK/CR6HSA1. Spark plug gapSpark plu g g ap:
0.6–0.7 mm (0.024–0.028 in)
Ti ghtenin g torque:
Spark plug: 13 Nm (1.3 m·kgf, 9.4 ft·lbf)
U51DE1E0.book Page 9 Thursday, August 29, 2013 4:41 PM

PERIODIC MAINTENANCE AND ADJUSTMENT
6-10
6
EAU37175
Engine oilThe engine oil level should be checked
before each ride. In addition, the oil
must be changed at the intervals spec-
ified in the periodic maintenance and
lubrication chart.
To check the en gine oil level
1. Place the vehicle on the center- stand. 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, remove the engine oil filler
cap, wipe the engine oil dipstick
clean, insert it back into the oil fill-
er hole (without screwing it in), and
then remove it again to check the
oil level.
TIPThe engine oil should be between the
minimum and maximum level marks.
4. If the engine oil is at or below theminimum level mark, add suffi-
cient oil of the recommended type
to raise it to the correct level.
5. Insert the dipstick into the oil filler hole, and then tighten the oil filler
cap.
To chan ge the en gine oil
1. Start the engine, warm it up for several minutes, and then turn it
off.
2. Place an oil pan under the engine to collect the used oil.
3. Remove the engine oil filler cap, the engine oil drain bolt and its
gasket to drain the oil from the
crankcase.
1. Engine oil filler cap
1. Engine oil dipstick
2. Maximum level mark
3. Minimum level mark
U51DE1E0.book Page 10 Thursday, August 29, 2013 4:41 PM