2008 YAMAHA YZF-R125 wheel

PERIODIC MAINTENANCE AND MINOR REPAIR
6-23
6 4. If the drive chain slack is incorrect,
adjust it as follows.
EAU34312
To adjust the drive chain slack
1. Loosen the axle nut and the lock-
nut on each side of the swingarm.2. To tighten the drive chain, turn the
drive chain slack adjusting bolt on
each side of the swingarm in direc-
tion (a). To loosen the drive chain,
turn the adjusting bolt on each side
of the swingarm in direction (b),
and then push the rear wheel for-
ward.
NOTE:Using the alignment marks on each
side of the swingarm, make sure that
both chain pullers are in the same posi-tion for proper wheel alignment.
CAUTION:
ECA10570
Improper drive chain slack will over-
load 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 thespecified limits.
3. Tighten the locknuts, then the axle
nut to their specified torques.
1. Drive chain slack
1. Axle nut
2. Drive chain slack adjusting bolt
3. Locknut
4. Alignment marks
Tightening torques:
Locknut:
16 Nm (1.6 m·kgf, 11 ft·lbf)
Axle nut:
85 Nm (8.5 m·kgf, 61 ft·lbf)
U5D7E0E0.book Page 23 Tuesday, December 18, 2007 10:13 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-28
6
EAU23280
Checking the steering Worn or loose steering bearings may
cause danger. Therefore, the operation
of the steering must be checked as fol-
lows at the intervals specified in the pe-
riodic maintenance and lubrication
chart.
1. Place a stand under the engine to
raise the front wheel off the
ground.
WARNING
EWA10750
Securely support the vehicle so thatthere is no danger of it falling over.
2. Hold the lower ends of the front
fork legs and try to move them for-
ward and backward. If any free
play can be felt, have a Yamaha
dealer check or repair the steering.
EAU23290
Checking the wheel bearings The front and rear wheel bearings must
be checked at the intervals specified in
the periodic maintenance and lubrica-
tion chart. If there is play in the wheel
hub or if the wheel does not turn
smoothly, have a Yamaha dealer check
the wheel bearings.
U5D7E0E0.book Page 28 Tuesday, December 18, 2007 10:13 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-32
6
EAUM2200
Replacing the license plate
light bulb 1. Remove the socket (together with
the bulb) by pulling it out.
2. Remove the defective bulb by pull-
ing it out.
3. Insert a new bulb into the socket.
4. Install the socket (together with the
bulb) by pushing it in.
EAU43230
Replacing an auxiliary light
bulb This model is equipped with two auxil-
iary lights. If an auxiliary light bulb burns
out, replace it as follows.
1. Remove the socket (together with
the bulb) by pulling it out.
2. Remove the defective bulb by pull-
ing it out.
3. Insert a new bulb into the socket.
4. Install the socket (together with the
bulb) by pushing it in.
EAU24350
Supporting the motorcycle Since this model is not equipped with a
centerstand, follow these precautions
when removing the front and rear
wheel or performing other maintenance
requiring the motorcycle to stand up-
right. Check that the motorcycle is in a
stable and level position before starting
any maintenance. A strong wooden
box can be placed under the engine for
added stability.
To service the front wheel
1. Stabilize the rear of the motorcycle
by using a motorcycle stand or, if
an additional motorcycle stand is
not available, by placing a jack un-
der the frame in front of the rear
wheel.
2. Raise the front wheel off the
ground by using a motorcycle
stand.
To service the rear wheel
Raise the rear wheel off the ground by
using a motorcycle stand or, if a motor-
cycle stand is not available, by placing
1. License plate light bulb
1. Auxiliary light bulb
U5D7E0E0.book Page 32 Tuesday, December 18, 2007 10:13 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-33
6 a jack either under each side of the
frame in front of the rear wheel or under
each side of the swingarm.
EAU24360
Front wheel
EAUM2420
To remove the front wheel
WARNING
EWA10820


It is advisable to have a Yamaha
dealer service the wheel.


Securely support the motor-
cycle so that there is no dangerof it falling over.
1. Loosen the front wheel axle pinch
bolt, then the wheel axle and the
brake caliper bolts.
2. Lift the front wheel off the ground
according to the procedure on
page 6-32.3. Remove the speed sensor lead
holder by removing the bolt.
4. Remove the brake hose holder by
removing the bolt.
5. Remove the brake caliper by re-
moving the bolts.
1. Front wheel axle pinch bolt
1. Speed sensor cable holder
U5D7E0E0.book Page 33 Tuesday, December 18, 2007 10:13 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-34
66. Pull the wheel axle out, remove the
speed sensor by pulling it out, and
then remove the wheel.
CAUTION:
ECA11050
Do not apply the brake after the
brake calipers have been removed,
otherwise the brake pads will beforced shut.
EAUM2430
To install the front wheel
1. Lift the wheel up between the fork
legs.
2. Install the speed sensor at the
wheel hub.NOTE:Make sure that the projections on the
speed sensor rotor are aligned with the
notches in the wheel hub and that the
slot in the speed sensor fits over the re-tainer on the fork leg.
3. Insert the wheel axle.
4. Lower the front wheel so that it is
on the ground.
5. Push down hard on the handlebar
several times to check for proper
fork operation.
6. Install the brake caliper by install-
ing the bolts.
NOTE:Make sure that there is enough space
between the brake pads before install-
ing the brake caliper onto the brakedisc.
7. Install the brake hose holder by in-
stalling the bolt.
8. Install the speed sensor lead hold-
er by installing the bolt.
9. Tighten the wheel axle, front wheel
axle pinch bolt and brake caliper
bolts to the specified torques.
1. Brake hose holder
2. Brake caliper bolt
3. Brake caliper
4. Axle bolt
1. Speedometer gear unit
Tightening torques:
Wheel axle:
59 Nm (5.9 m·kgf, 43 ft·lbf)
Front wheel axle pinch bolt:
14 Nm (1.4 m·kgf, 10 ft·lbf)
Brake caliper bolt:
30 Nm (3.0 m·kgf, 22 ft·lbf)
U5D7E0E0.book Page 34 Tuesday, December 18, 2007 10:13 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-35
6
EAU25080
Rear wheel
EAU25311
To remove the rear wheel
WARNING
EWA10820


It is advisable to have a Yamaha
dealer service the wheel.


Securely support the motor-
cycle so that there is no dangerof it falling over.
1. Loosen the axle nut.
2. Lift the rear wheel off the ground
according to the procedure on
page 6-32.3. Remove the axle nut.
4. Loosen the locknut on each side of
the swingarm.
5. Turn the drive chain slack adjust-
ing bolts fully in direction (a) and
push the wheel forward.
6. Remove the drive chain from the
rear sprocket.
NOTE:

If the drive chain is difficult to re-
move, remove the wheel axle first,
and then lift the wheel upward
enough to remove the drive chain
from the rear sprocket.


The drive chain cannot be disas-sembled.7. While supporting the brake caliper
bracket, pull the wheel axle out,
and then remove the wheel.
CAUTION:
ECA11070
Do not apply the brake after the
wheel has been removed together
with the brake disc, otherwise thebrake pads will be forced shut.
EAU39411
To install the rear wheel
1. Install the wheel and the brake cal-
iper bracket by inserting the wheel
axle from the left-hand side.NOTE:

Make sure that the slot in the brake
caliper bracket is fit over the retain-
er on the swingarm.


Make sure that there is enough
space between the brake pads be-fore installing the wheel.
1. Axle nut
2. Drive chain slack adjusting bolt
3. Locknut
4. Brake caliper
U5D7E0E0.book Page 35 Tuesday, December 18, 2007 10:13 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-36
62. Install the drive chain onto the rear
sprocket.
3. Install the axle nut, and then lower
the rear wheel so that it is on the
ground.
4. Adjust the drive chain slack. (See
page 6-22.)
5. Tighten the axle nut to the speci-
fied torque.
EAU25870
Troubleshooting Although Yamaha motorcycles receive
a thorough inspection before shipment
from the factory, trouble may occur dur-
ing operation. Any problem in the fuel,
compression, or ignition systems, for
example, can cause poor starting and
loss of power.
The following troubleshooting charts
represent quick and easy procedures
for checking these vital systems your-
self. However, should your motorcycle
require any repair, take it to a Yamaha
dealer, whose skilled technicians have
the necessary tools, experience, and
know-how to service the motorcycle
properly.
Use only genuine Yamaha replace-
ment parts. Imitation parts may look like
Yamaha parts, but they are often inferi-
or, have a shorter service life and can
lead to expensive repair bills.
1. Retainer
2. SlotTightening torque:
Axle nut:
85 Nm (8.5 m·kgf, 61 ft·lbf)
U5D7E0E0.book Page 36 Tuesday, December 18, 2007 10:13 AM

MOTORCYCLE CARE AND STORAGE
7-1
7
EAU37833
Matte color caution CAUTION:
ECA15192
Some models are equipped with
matte colored finished parts. Be
sure to consult a Yamaha dealer for
advice on what products to use be-
fore cleaning the vehicle. Using a
brush, harsh chemical products or
cleaning compounds when cleaning
these parts will scratch or damage
their surface. Wax also should not
be applied to any matte colored fin-ished parts.
EAUM2450
Care While the open design of a motorcycle
reveals the attractiveness of the tech-
nology, it also makes it more vulnera-
ble. Rust and corrosion can develop
even if high-quality components are
used. A rusty exhaust pipe may go un-
noticed on a car, however, it detracts
from the overall appearance of a motor-
cycle. Frequent and proper care does
not only comply with the terms of the
warranty, but it will also keep your
motorcycle looking good, extend its life
and optimize its performance.
Before cleaning
1. Cover the muffler outlet with a
plastic bag after the engine has
cooled down.
2. Make sure that all caps and covers
as well as all electrical couplers
and connectors, including the
spark plug cap, are tightly in-
stalled.
3. Remove extremely stubborn dirt,
like oil burnt onto the crankcase,
with a degreasing agent and a
brush, but never apply such prod-ucts onto seals, gaskets, sprock-
ets, the drive chain and wheel
axles. Always rinse the dirt and de-
greaser off with water.
Cleaning
CAUTION:
ECA10771


Avoid using strong acidic wheel
cleaners, especially on spoked
wheels. If such products are
used on hard-to-remove dirt, do
not leave the cleaner on the af-
fected area any longer than in-
structed. Also, thoroughly rinse
the area off with water, immedi-
ately dry it, and then apply a cor-
rosion protection spray.


Improper cleaning can damage
plastic parts such as cowlings,
panels, windshields, headlight
lenses, meter lenses, etc. 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. Be
sure to avoid using cloths or
sponges which have been in
U5D7E0E0.book Page 1 Tuesday, December 18, 2007 10:13 AM