2008 YAMAHA TTR50 wheel

PERIODIC MAINTENANCE AND MINOR REPAIR
6-18
6 2. To tighten the drive chain, turn the
adjusting nut at each end of the
swingarm in direction (a). To loos-
en the drive chain, turn the adjust-
ing nut at each end of the
swingarm in direction (b), and then
push the rear wheel forward.
NOTE:Using the alignment marks on each
side of the swingarm, make sure that
both adjusting nuts are in the same po-sition 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 both locknuts and the axle
nut to the specified torques.4. Adjust the brake pedal free play.
(See page 6-16.)
1. Brake pedal free play adjusting nut
2. Drive chain slack adjusting nut
3. Locknut
1
2
3
1. Axle nut
2. Locknut
3. Drive chain slack adjusting nut
4. Alignment marks
1(b) 4(a)
2
3
Tightening torques:
Locknut:
7.0 Nm (0.7 m·kgf, 5.1 ft·lbf)
Axle nut:
60 Nm (6.0 m·kgf, 43 ft·lbf)
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PERIODIC MAINTENANCE AND MINOR REPAIR
6-22
6
CAUTION:
ECA10590
If any damage is found or the front
fork does not operate smoothly,
have a Yamaha dealer check or re-pair it.
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.
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PERIODIC MAINTENANCE AND MINOR REPAIR
6-23
6
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.
EAU40440
Battery This model is equipped with a sealed-
type (MF) battery, which does not re-
quire any maintenance. There is no
need to check the electrolyte or to add
distilled water.
WARNING
EWA10760


Electrolyte is poisonous and
dangerous since it contains sul-
furic acid, which causes severe
burns. Avoid any contact with
skin, eyes or clothing and al-
ways shield your eyes when
working near batteries. In case
of contact, administer the fol-
lowing FIRST AID.
EXTERNAL: Flush with plenty
of water.
INTERNAL: Drink large quan-
tities of water or milk and im-
mediately call a physician.
EYES: Flush with water for 15
minutes and seek prompt
medical attention.


Batteries produce explosive hy-
drogen gas. Therefore, keep
sparks, flames, cigarettes, etc.,away from the battery and pro-
vide sufficient ventilation when
charging it in an enclosed
space.


KEEP THIS AND ALL BATTER-
IES OUT OF THE REACH OFCHILDREN.
To remove the battery
1. Remove the seat. (See page 3-7.)
2. Remove the battery cover by re-
moving the bolts.
3. Unhook the battery band, and then
pull the battery out of the battery
compartment.
1. Bolt
2. Battery
3. Battery cover
U1P682E0.book Page 23 Wednesday, May 23, 2007 9:34 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-25
6
EAU42020
Replacing the fuse The fuse is located inside the battery
coupler.
If the fuse is blown, replace it as fol-
lows.
1. Turn the key to “OFF” and turn off
all electrical circuits.
2. Disconnect the battery coupler.
3. Remove the blown fuse, and then
install a new fuse of the specified
amperage.
CAUTION:
ECA10640
Do not use a fuse of a higher amper-
age rating than recommended to
avoid causing extensive damage to
the electrical system and possibly afire.
4. Connect the battery coupler.
5. Turn the key to “ON” and turn on
the electrical circuits to check if the
devices operate.
6. If the fuse immediately blows
again, have a Yamaha dealer
check the electrical system.
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. Fuse
2. Spare fuseSpecified fuse:
10.0 A
U1P682E0.book Page 25 Wednesday, May 23, 2007 9:34 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-26
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
EAU39791
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. Remove the guard from each front
fork leg by removing the bolts.
2. Disconnect the brake cable at the
wheel by removing the brake lever
free play adjusting nut at the brakecamshaft lever, then remove the
cable from the brake camshaft le-
ver.
3. Loosen the axle nut.
1. Front fork leg guard
2. Bolt
1. Brake cable
2. Brake camshaft lever
3. Brake lever free play adjusting nut
1. Axle nut
2. Washer
U1P682E0.book Page 26 Wednesday, May 23, 2007 9:34 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-27
64. Lift the front wheel off the ground
according to the procedure on
page 6-25.
5. Remove the axle nut and washer.
6. Pull the wheel axle out, and then
remove the wheel.
EAU39801
To install the front wheel
1. Lift the wheel up between the fork
legs.
2. Insert the wheel axle from the
right-hand side.NOTE:Make sure that the slot in the brake
shoe plate fits over the retainer on thefork leg.3. Lower the front wheel so that it is
on the ground.
4. Install the washer and axle nut,
and then tighten the axle nut to the
specified torque.
5. Connect the brake cable to the
brake camshaft lever, and then in-
stall the brake cable free play ad-
justing nut on the brake cable.
6. Adjust the brake lever free play.
(See page 6-15.)7. While applying the front brake,
push down hard on the handlebar
several times to check for proper
fork operation.
8. Install each front fork leg guard by
installing the bolts.1. Wheel axle
1. Slot
2. RetainerTightening torque:
Axle nut:
35 Nm (3.5 m·kgf, 25 ft·lbf)
1
2
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PERIODIC MAINTENANCE AND MINOR REPAIR
6-28
6
EAU25080
Rear wheel
EAU39770
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. Remove the brake pedal free play
adjusting nut, and then disconnect
the brake rod from the brake cam-
shaft lever.
3. Loosen the locknut and drive chain
adjusting nut on each end of the
swingarm.
4. Lift the rear wheel off the ground
according to the procedure on
page 6-25.
5. Remove the axle nut and washer,
then pull the wheel axle out.6. Push the wheel forward, and then
remove the drive chain from the
rear sprocket.
NOTE:The drive chain does not need to be
disassembled in order to remove andinstall the wheel.
1. Axle nut
2. Washer
3. Drive chain slack adjusting nut
4. Locknut
1
4
3
2
1. Brake pedal free play adjusting nut
2. Brake rod
3. Brake camshaft lever
1
2
3
1. Wheel axle
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PERIODIC MAINTENANCE AND MINOR REPAIR
6-29
67. Remove the wheel.
EAU39781
To install the rear wheel
1. Install the drive chain onto the rear
sprocket, and then install the
wheel by inserting the wheel axle
from the right-hand side.NOTE:Make sure that the slot in the brake
shoe plate fits over the retainer on theswingarm.
2. Connect the brake rod to the brake
camshaft lever, and then install the
brake pedal free play adjusting nut
onto the brake rod.3. Adjust the drive chain slack. (See
page 6-17.)
4. Install the washer and axle nut,
and then lower the rear wheel so
that it is on the ground.
5. Tighten the axle nut to the speci-
fied torque.
6. Adjust the brake pedal free play.
(See page 6-16.)
EAU25850
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 chart
represents a quick and easy procedure
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. Slot
2. Retainer
Tightening torque:
Axle nut:
60 Nm (6.0 m·kgf, 43 ft·lbf)
U1P682E0.book Page 29 Wednesday, May 23, 2007 9:34 AM