YAMAHA YBR125 2007 Owner's Guide

1. Panel APanel removal and installa-
tionThe panels illustrated need to be
removed to perform some of the
maintenance described in this
manual. Refer to this section each
time a panel has to be removed or
reinstalled.
2. Panel BPERIODIC MAINTENANCE AND MINOR REPAIR
6-51. Lug
2. Panel A
3. Lug
Removal of Panel AUnlock the panel.
Pull the lug 1 towards you to remove
it from the fuel tank.
Slide the panel A towards the Front
of the motorcycle for removing the
lug 3 to free the panel.
2
3 1
2
1

PERIODIC MAINTENANCE AND MINOR REPAIR
6-6 1. Lug
2. Lug
Removal of Panel BLoosen screw completely and follow
the same procedure as for
removing panel A.
1. Lug
2. LugInstallation of Panel ASlide the panel towards the Rear of
the motorcycle for inserting the lug
2 in the slot given in the frame.
Insert and push the lug 1 in the
fuel tank ensuring proper seating.
After proper seating of the panel A,
lock it.
1. Lug.
2. LugInstallation of Panel BFollow the same procedure as given
for installation of panel A and tighten
the screw for locking.
2 1
1 2
1
2
1

A. Spark plug gapSpark plug inspectionThe spark plug is an important engine
component and is easy to inspect.
The condition of the spark plug can
indicate the condition of the engine.
The ideal color on the white insulator
around the center electrode is a
medium-to-light tan color for a
Motorcycle that is being riddennormally. Do not attempt to diagnose
any problems yourself. Instead, take
the Motorcycle to a YAMAHA dealer.
You should periodically remove and
inspect the spark plug because heat
and deposits will cause the spark plug
to slowly break down and erode. If
electrode erosion becomes exces-
sive, or if carbon and other deposits
are excessive, you should replace the
spark plug with the specified plug.
Before installing the spark plug,
measure the electrode gap with a wire
thickness gauge; adjust the gap to
specification as necessary.
PERIODIC MAINTENANCE AND MINOR REPAIR
6-7
A.- Spark plug gap: 0.8 ±0.1 mm
When installing the plug, always
clean the gasket surface and use a
new gasket. Wipe off any grime from
the threads and tighten the spark plug
to the specified torque.
Tightening torque:
Spark plug:
12 ft-lb (1.75 m-kg)NOTE :If a torque wrench is not available
when you are installing a spark plug,
a good estimate of the correct
torque is 1/4 to 1/2 turn past finger
using a box spanner.
AALWAYS USE ONLY THE STANDARD RECOMMENDED MAKE AND TYPE OF
SPARK PLUG
Specified spark plug:
P-RA7HC-(CHAMPION)

NOTE :
ALWAYS CHANGE ENGINE OIL AT RECOMMENDED INTERVALS
FOR OPTIMUM ENGINE PERFORMANCE AND ENGINE LIFE
1. Engine oil filler capEngine oil1. Oil level measurement
a. Place the Motorcycle on the
centerstand. Warm up the engine
for several minutes.
Be sure the Motorcycle is positioned
straight up when checking the oil
level. A slight tilt toward the side can
result in false readings.
1. Maximum level
2. Minimum levelWait a few minutes until the oil level
settles before checking.
b. Unscrew the dipstick and rest it
on the threads of the oil filler hole.
The oil level should be between
the minimum and maximum mark
on the dip- stick. If the level is low,
add oil to raise it to the specified
level.
PERIODIC MAINTENANCE AND MINOR REPAIR
6-8
NOTE :
1. Dipstick2. Engine oil replacement
a. Warm up the engine for a few
minutes.
b. Stop the engine. Place an oil pan
under the engine and remove the
dipstick.
1
1

ALWAYS USE ONLY THE RECOMMENDED GRADE OF ENGINE OIL
1 . Engine oil drain plugc. Remove the drain plug and drain
the oil.
d. Reinstall the drain plug and
tighten it to the specified
torque.Tightening torque:
Drain plug:
14.5 It-lb (2.0 m-kg)
e. Fill engine with oil and install
the dipstick.
Recommended oil:
YAMALUBE 4-stroke motor oil
(20W40 type SG).
Oil quantity:
Total amount:
1.2 L
Periodic oil change:
1.0 L
PERIODIC MAINTENANCE AND MINOR REPAIR
6-9
f. Start the engine and warm up
for a few minutes. While
warming up, check for oil leak-
age. If oil leakage is found, stop
the engine immediately and
check for the cause.

1. Air filter case cover
2. Screw(3 Nos)Air filterThe air filter should be cleaned at
the specified intervals. It should be
cleaned more frequently when riding
in unusually wet or dusty areas.
1. Remove panel B. (See page 6-5for removal and installation
procedures.)
2. Remove the air filter case fitting screws and the air filter case
cover.
1. Air filter element
2. Lockable SpringWire
PERIODIC MAINTENANCE AND MINOR REPAIR
6-10
3. Remove the air filter from thecase.
4. Unlock the spring wire.
1. Air filter element
2. Frame6. Apply recommended oil to the entire surface of the each element
and squeeze out the excess oil.
They should be wet but not
dripping.
Recommended oil:
20W40 Type SG
2 1
2
1 2
2
1

CAUTION :
CAUTION :
Make sure the air filter is
properly seated in the air filter
case.
The engine should never be run
without the air filter installed.
Excessive piston and/or
cylinder wear may result.
Dirty Element Air Cleaner
causes excessive fuel
consumption and loss of
power.
Clean Element Air Cleaner after
every 2000 Kms.
The Element Air Cleaner should
be cleaned and lubricated more
frequently (every 1000 kms), if
Motorcycle is operated in very
dusty (e.g. unpaved, dust laden
roads) conditions.
Carburetor adjustmentThe carburetor is a vital part of the
engine and requires very sophisti-
cated adjustments. Most adjust-
ments should be left to a YAMAHA
dealer who has the professional
knowledge and experience to do so.
However, the following may be
serviced by the owner as part of
routine maintenance.
The carburetor is set at the
YAMAHA factory after many
tests. If the settings are changed,
poor engine performance and
damage may result.
PERIODIC MAINTENANCE AND MINOR REPAIR`
6-11
7. Pull the air filter elements over
the frame and install the air filter
in the case.
8. Install the Spring Wire
9. Install the air filter case cover
and panelCAUTION :NOTE :Ensure no distoration/proper
positioning of felt Seal 1 , if
damaged contact YAMAHA Dealer.Do not twist Element Air Cleaner.

NOTE :
NOTE :
NOTE :
Idle speed adjustmentA diagnostic tachometer must be
used for this procedure.
1. Attach the tachometer. Start the
engine and warm it up for a few
minutes at approximately 1,300
to 1,500 r/min. Occasionally rev
the engine to 4,000 to 5,000
r/min. The engine is warm when it
quickly responds to the throttle.
1. Throttle stop screw2. Set the idle to the specified
engine speed by adjusting the
throttle stop screw. Turn the
screw in direction a to increase
engine speed and in direction b
to decrease engine speed.
Standard idle speed:
1,300 ~ 1,500 r/min
If the specified idle speed cannot be
obtained by performing the above
adjustment, consult a
dealer.YAMAHA
Throttle cable free play
adjustmentBefore checking the throttle cable
free play, the engine idling speed
should be adjusted.
Adjust the throttle cable by turning
the adjusting nut so that specified
free play at the throttle grip is
obtained.
Free play:
3 ~ 7mm
PERIODIC MAINTENANCE AND MINOR REPAIR
6-12

KEEP RECOMMENDED TYRE PRESSURE IN BOTH THE TYRES
2. Locknut
3. Adjusting nut
1. Loosen the locknut.
2. Turn the adjusting nut in direction
a to increase free play and in
direction b to decrease free
play.
3. Tighten the locknut.Valve clearance adjustmentThe correct valve clearance
changes with use, resulting in
improper fuel/air supply or engine
noise. To prevent this, the valve
clearance must be adjusted
regularly. This adjustment however,
should be left to a YAMAHA dealer.
1. Tread depth
2. Side wallTyresTo ensure maximum performance,
long service and safe operation,
note the following:
1. Tyre air pressure
Always check and correct the
tyre pressure before operating
the Motorcycle.
PERIODIC MAINTENANCE AND MINOR REPAIR
6-13
1. Free play

WARNING
WARNING
Minimum tyre
tread depth :
(front and rear)
1.0 mm
Tyre inflation pressure should be
checked and adjusted when the
temperature of the tyre equals the
ambient air temperature. Tyre
inflation pressure must be adjust-
ed according to total weight of
cargo, rider, passenger, and
accessories (fairing, saddlebags,
etc. approved for this model), and
vehicle speed.Proper loading of your Motorcycle
is important for several character-
istics of your Motorcycle, such as
handling, braking, performance
and safety. Do not carry loosely
packed items that can shift.
Securely pack your heaviest items
close to the center of the Motorcy-
cle, and distribute the weight
evenly from side to side. Properly
adjust the suspension for your
load, and check the condition and
pressure of your tyres. NEVER
OVERLOAD YOUR
MOTORCYCLE. Make sure the
total weight of the cargo, rider,
passenger, and accessories
(fairing, saddlebags, etc.
approved for this model) does not
exceed the maximum load of the
Motorcycle. Operation of an over-
loaded Motorcycle could cause
tyre damage, an accident, or even
injury.2. Tyre inspection
Always check the tyres before
operating the Motorcycle. If a tyre
tread shows crosswise lines
(minimum tread depth), if the tyre
has a nail or glass fragments in it,
or if the side wall is cracked,
contact a dealer
immediately and have the tyre
replaced.YAMAHAPERIODIC MAINTENANCE AND MINOR REPAIR
6-14
Front Rear Cold tyre pressure:
Single Rider25 psi
25 psi (1.75kg/cm )
2
(1.75kg/cm )
2(2.25kg/cm )
2
(2.50kg/cm )
2
33 psi
36 psi
With Pillion Rider
Front tyre size:
2.75-18” 4PR
Rear tyre size:
3.00-18” 6PR