YAMAHA YBR125 2007 Workshop Manual

When inspecting the battery, be
sure the breather hose is routed
correctly. If the breather hose is
positioned in such a way as to
cause battery electrolyte or gas to
exit onto the frame, structural and
cosmetic damage to the
Motorcycle can occur.
Battery electrolyte is poisonous
and dangerous, causing severe
burns, etc. It contains sulfuric
acid. Avoid contact with skin, eyes
or clothing.Antidote:
EXTERNAL: Flush with water.
INTERNAL: Drink large quantities
of water or milk. Follow with milk of
magnesia, beaten egg, or
vegetable oil. Call a physician
immediately. EYES: Flush with
water for 15 minutes and get
prompt medical attention.
Batteries produce explosive
gases. Keep sparks, flame,
cigarettes etc., away. Ventilate
when charging or using in an
enclosed space. Always shield
your eyes when working near
batteries. KEEP OUT OF REACH
OF CHILDREN.Replenishing the battery fluid
Normal tap water contains
minerals which are harmful to a
battery; therefore, refill only with
distilled water.
Take care not to spill battery fluid
on the chain. Battery fluid may
weaken the chain causing shorter
chain life and possibly result in an
accident A poorly maintained battery will
corrode and discharge quickly. The
battery fluid should be checked at
least once a month. The level should
be between the minimum level and
maximum level marks. Use only
distilled water if refilling is necessary.
PERIODIC MAINTENANCE AND MINOR REPAIR
6-25
ENSURE THAT BATTERY ELECTROLYTE LEVEL IS MAINTAINED BETWEEN
MAX . AND MIN. MARKS. IF REQUIRED, ADD DISTILLED WATER ONLY
CAUTION :
CAUTION :WARNING

Battery storage
1. When the Motorcycle will not be
used for a month or longer,
remove the battery, fully charge it
and store it in a cool, dry place.
Completely recharge the battery
before reinstallation.
2. If the battery will be stored for
longer than two months, check
the specific gravity of the fluid at
least once a month and fully
recharge the battery when it is too
low.
3. Always make sure the
connections are correct when
putting the battery back in the
motorcycle. Make sure the
breather hose is properly
connected and is not damaged or
obstructed.
1. Main fuseFuse replacementThe fuse is located behind panel A.
(See page 6-6 for panel removal and
installation procedures.)
If the fuse is blown, turn off the main
switch. Install a new fuse of proper
amperage. Turn on the switches and
see if the electrical device operates.
If the fuse immediately blows again,
consult a YAMAHA dealer.Do not use fuse of higher
amperage rating than those
recommended. Substitution of a
fuse of improper rating can cause
extensive electrical system
damage and possibly a fire.
Specified fuse: 10A
PERIODIC MAINTENANCE AND MINOR REPAIR
6-26
CAUTION :
1

1. Screw (2 Nos.)
2. Bolt (1Headlight bulb replacementIf the headlight bulb burns out,
replace the bulb as follows:
1. Remove the two screws from the
Head Light.
2. Loosen bolt.
3. Remove head light bezel assy.
Forward.
No.)1. Bulb holder
3. Remove headlight bulb holder
from bezel
1. Bulb (Halogen)Keep flammable products and
your hands away from the bulb
while it is on, as it is hot. Do not
touch the bulb until it cools down.
4. Remove the defective bulb.
5. Put a new bulb into position and
secure it in place with the bulb
holder.
6. Install the Head Light Assy.
7. If the headlight beam adjustment
is necessary, ask a YAMAHA
dealer to make adjustment.
PERIODIC MAINTENANCE AND MINOR REPAIR
6-27
WARNING
1

1. Indicator Screws (1 No.)Turn signal and taillight
bulb replacement1. Remove the screws and the
lense.
2. Push the bulb inward and turn it
counterclockwise.
3. Place a new bulb in the socket.
Push the bulb inward and turn it
clockwise until it engages into the
socket.
4. Install the lense and the
screws.1. Tail lamp Screws (2 Nos.)
Do not over-tighten the screws as
the lense may break.
Front wheel removalIt is advisable to have a
YAMAHA dealer service the
wheel.
Securely support the
Motorcycle so there is no
danger of it falling over.
PERIODIC MAINTENANCE AND MINOR REPAIR
6-28
WARNING
CAUTION :

1. Brake cable adjusting nut1. Place the Motorcycle on the
centerstand.
2. Fully loosen the brake cable
adjusting bolt at the handlebar
lever holder.
3 Fully loosen the brake cable
adjusting nut at the wheel hub and
remove the cable from the brake
cam lever.
1. Clip
2. Speedometer cable4. Remove the speedometer cable
from the front wheel side. First
remove the clip and then pull the
cable out.
1. Cotter pin
2. Axle nut5. Remove the cotter pin and axle
nut.
6. Remove the wheel axle. Make
sure the Motorcycle is properly
supported.
PERIODIC MAINTENANCE AND MINOR REPAIR
6-29

1. StopperFront wheel installationWhen installing the front wheel,
reverse the removal procedure.
Pay attention to the following points:
1. Make sure the slot in the brake
shoe plate fits over the stopper on
the front fork outer tube.
2. Make sure the axle nut is properly
torqued and a new cotter pin is
installed.Always use a new cotter pin.
Axle nut torque:
33 ft-lb (4.55 m-kg)
3. Adjust the free play in the brake
lever.PERIODIC MAINTENANCE AND MINOR REPAIR
6-30
WARNING
Rear wheel removalIt is advisable to service the
wheel by a YAMAHA dealer.
Securely support the
Motorcycle so there is no
danger of it falling over.
WARNING

1. Nut
2. Cotter pin
3. Tension bar1. Place the Motorcycle on the
centerstand.
2. Remove the cotter pin and nut.
Then remove the tension bar
from the brake shoe plate.
1. Axle nut
2. Cotter pin
3. Brake rod
4. Brake adjusting nut3. Remove the brake adjusting nut
and brake rod from the brake cam
lever.
4. Remove the axle nut cotter pin
and the axle nut.
1. Rear axle5. Pull out the rear axle.
6. Remove the wheel assembly.
PERIODIC MAINTENANCE AND MINOR REPAIR
6-31
ALWAYS USE YAMAHA GENUINE SPARE PARTS

Rear wheel installation1. Install the rear wheel and the
axle.
2. Install the axle nut.
3. Insert the brake rod into the
brake cam lever and install the
brake free play adjusting nut.
4. Install the tension bar onto the
brake shoe plate and tighten the
tension bar nut to the specified
tightening torque.
5. Take the Motorcycle off the
centerstand.
6. Tighten the axle nut to the
specified tightening torque.
Then install a new cotter pin.
Specified torque:
Tension bar nut:
14 ft-lb (1.9 m kg)
Axle nut:
65 ft-lb (9.05 m kg)Always use a new cotter pin.
Check the operation of the brake
light after adjusting the rear brake. 7. Adjust the rear brake pedal free
play. (See page 6-17.)
TroubleshootingAlthough YAMAHA Motorcycles
receive a rigid inspection before
shipment from the factory, trouble
may occur during operation. Any
problem in the fuel, compression, or
ignition systems can cause poor
starting and loss of power. The
troubleshooting chart describes a
quick, easy procedure for making
checks. If your Motorcycle requires
any repair, bring it to a YAMAHA
dealer. The skilled technicians at a
YAMAHA dealership have the tools,
experience, and know-how to
properly service your Motorcycle.
Use only genuine YAMAHA parts
on your Motorcycle. Imitation
parts may look like YAMAHA
parts, but they are often inferior.
Consequently, they have a shorter
service life and can lead to
expensive repair bills.
PERIODIC MAINTENANCE AND MINOR REPAIR
6-32
WARNINGWARNING

Ask YAMAHA dealer to inspect.compression check. Engine doesn't start, go to
Dry with
Black SootWet No compression.
There is compression
electrode. plug and check Remove spark Use kick starter.
Wipe clean with dry cloth
and correct spark plugGo to Ignition check. Enough fuel
No fuelGO TO compression check
in the fuel tank Check if there is fuel
Supply fuel.
Open the throttle half-way
and start the engine.
or replace spark plug.
WARNING
Never Check the fuel system while smoking or in the vicinity of an open flame.
PERIODIC MAINTENANCE AND MINOR REPAIR
6-33Ask YAMAHA
dealer to inspect.
Troubleshooting chart - For Starting
1. Fuel
2. Compression
3. Ignition
If Engine does not start
Contact YAMAHA dealer.

A. CLEANINGFrequent, thorough cleaning of your
Motorcycle will not only enhance its
appearance but will improve its
general performance and extend
the useful life of many components.1. Before cleaning the Motorcycle:
a. Block off the end of the exhaust
pipe to prevent water entry; a
plastic bag and strong rubber
band may be used.
b. Make sure the spark plug and all
filler caps are properly installed.
2. If the engine case is excessively
greasy, apply degreaser with a
paint brush. Do not apply
degreaser to the chain, sprockets,
or wheel axles.
3. Rinse the dirt and degreaser off
with a garden hose. Use only
enough pressure to do the job.Direct excessive Hose Pressure
may cause water Entry Into Wheel
Bearing, Front Fork Brakes,
Transmission Seals & Electrical
Parts, there-by leading to its
Detorioration.
7-1
Improper cleaning can damage
the cowlings, panels and other
plastic parts. Use only a soft,
clean cloth or sponge with mild
detergent and water to clean
plastic.
Do not use any harsh chemical
products on plastic parts.
Alaways use clean cloth or
sponge for cleaning the
Motorcycle.
CAUTION :4. After riding on dirty roads, wash
the Motorcycle with cold water
immediately. Do not use warm
water to clean the tyre.
5. Once the majority of the dirt has
been hosed off, wash all surfaces
with warm water and mild,
detergent-type soap. An old
toothbrush or bottle brush is
handy for hard-to-get-at places.
6. Rinse the Motorcycle off
immediately with clean water and
dry all surfaces with a chamois,
clean towel, or soft absorbent
cloth.
7. Dry the chain and lubricate it to
prevent rust.
CAUTION :CLEANING AND STORAGE