2007 YAMAHA TTR90 maintenance

PERIODIC MAINTENANCE AND MINOR REPAIR
6-29
6 2. Remove the brake pedal free play
adjusting nut, and then disconnect
the brake rod at the brake cam-
shaft lever.
3. Loosen the locknut and the drive
chain slack adjusting nut on both
ends of the swingarm.4. Loosen the axle nut.
5. Lift the rear wheel off the ground
according to the procedure on
page 6-26.
6. Remove the axle nut and washer,
and then pull the wheel axle out.
7. 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.
8. Remove the wheel.
EAU41651
To install the rear wheel
1. Install the drive chain onto the rear
sprocket.
2. Insert the wheel axle from the
right-hand side.
3. Adjust the drive chain slack. (See
page 6-18.)
4. Lower the rear wheel so that it is
on the ground.
5. Install the brake rod onto the brake
camshaft lever, and then install the
brake pedal free play adjusting nut
onto the brake rod.
6. Connect the brake torque rod to
the brake shoe plate by installing
the bolt and nut, and then tighten
the bolt to the specified torque.
7. Insert a new cotter pin.
8. Tighten the axle nut to the speci-
fied torque.
9. Adjust the brake pedal position
and free play. (See page 6-17.)
1. Brake rod
2. Brake pedal free play adjusting nut
3. Brake camshaft lever
4. Wheel axle
1. Axle nut
2. Washer
3. Drive chain slack adjusting nut
4. Locknut
Tightening torques:
Brake torque rod bolt:
26 Nm (2.6 m·kgf, 19 ft·lbf)
Axle nut:
60 Nm (6.0 m·kgf, 43 ft·lbf)
U3P281E0.book Page 29 Monday, April 17, 2006 11:26 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-30
6
WARNING
EWA10660
After adjusting the brake pedal free
play, check the operation of thebrake light.
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.
U3P281E0.book Page 30 Monday, April 17, 2006 11:26 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-31
6
EAU25971
Troubleshooting chart [TT-R90(W)]
WARNING
EWA10840
Keep away open flames and do not smoke while checking or working on the fuel system.
Check the fuel level in
the fuel tank.1. Fuel
There is
enough fuel.
There is
no fuel.
Supply fuel.
Operate the kickstarter.2. Compression
There is compression.
There is
no compression.Check the ignition.
Have a Yamaha dealer
check the vehicle.
Remove the spark plug
and check the electrodes.3. Ignition
Wet
DryWipe off with a dry cloth and correct the
spark plug gap, or replace the spark plug.
Have a Yamaha dealer check the vehicle.The engine does not start.
Have a Yamaha dealer check the vehicle.
Open the throttle halfway and operate
the kickstarter.
Check the compression.
The engine does not start.
Check the compression.
U3P281E0.book Page 31 Monday, April 17, 2006 11:26 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-32
6
EAU25901
Troubleshooting chart [TT-R90E(W)]
WARNING
EWA10840
Keep away open flames and do not smoke while checking or working on the fuel system.
Check the fuel level in
the fuel tank.1. Fuel
There is enough fuel.
There is no fuel.
Check the compression.
Supply fuel.
The engine does not start.
Check the compression.
Operate the electric starter.2. Compression
There is compression.
There is no compression.
Check the ignition.
Have a Yamaha dealer
check the vehicle.
Remove the spark plug
and check the electrodes.3. Ignition
Wipe off with a dry cloth and correct the
spark plug gap, or replace the spark plug.
Have a Yamaha dealer check the vehicle.
The engine does not start.
Have a Yamaha dealer
check the vehicle.
The engine does not start.
Check the battery.
Operate the electric starter.4. Battery
The engine turns over
quickly.
The engine turns over
slowly.
The battery is good.Check the battery lead connections,
and charge the battery if necessary.
DryWet
Open the throttle halfway and operate
the electric starter.
U3P281E0.book Page 32 Monday, April 17, 2006 11:26 AM

INDEX
AAccessories and replacement parts ..... 6-16
Air filter element, cleaning .................... 6-10BBattery [TT-R90E(W)] ........................... 6-24
Brake and shift pedals, checking and
lubricating ........................................... 6-21
Brake lever ............................................. 3-2
Brake lever, checking and lubricating ... 6-22
Brake lever free play, adjusting ............ 6-17
Brake pedal ............................................ 3-2
Brake pedal free play, adjusting ........... 6-17
Brake shoes, checking ......................... 6-18CCables, checking and lubricating .......... 6-21
Carburetor, adjusting ............................ 6-13
Care ........................................................ 7-1
Cowling and panel, removing and
installing ............................................... 6-6DDrive chain, cleaning and lubricating .... 6-20
Drive chain slack .................................. 6-18EEngine break-in ...................................... 5-4
Engine idling speed .............................. 6-13
Engine oil ................................................ 6-8
Engine, starting a warm .......................... 5-2
Engine stop switch [TT-R90E(W)] .......... 3-1
Engine stop switch [TT-R90(W)]............. 3-1FFront fork, checking .............................. 6-23
Fuel......................................................... 3-3
Fuel cock ................................................ 3-5
Fuel tank breather hose.......................... 3-4Fuel tank cap........................................... 3-3
Fuse, replacing [TT-R90E(W)] ..............6-26
HHandlebar switches ................................. 3-1IIdentification numbers ............................. 9-1KKey identification number
[TT-R90E(W)]........................................ 9-1
Kickstarter ............................................... 3-6LLabels, location of ...................................1-4MMain switch [TT-R90E(W)] ...................... 3-1
Maintenance and lubrication, periodic..... 6-4
Maintenance, emission control system ... 6-3
Maintenance, periodic ............................. 6-1
Model label .............................................. 9-2PParking [TT-R90E(W)].............................5-5
Parking [TT-R90(W)] ...............................5-4
Part locations .......................................... 2-1
Pre-operation check list........................... 4-2SSafety information ...................................1-1
Seat ......................................................... 3-7
Shifting ....................................................5-3
Shift pedal ............................................... 3-2
Sidestand ................................................ 3-7
Sidestand, checking and lubricating...... 6-22
Spark arrester, cleaning ........................ 6-12
Spark plug, checking ...............................6-7
Specifications .......................................... 8-1
Starter (choke) lever................................ 3-6Starting and warming up a cold engine
[TT-R90E(W)] ....................................... 5-2
Starting and warming up a cold engine
[TT-R90(W)].......................................... 5-1
Starting circuit cut-off system
[TT-R90E(W)] ....................................... 3-8
Start switch [TT-R90E(W)] ...................... 3-1
Steering, checking ................................ 6-23
Storage [TT-R90E(W)] ............................ 7-4
Storage [TT-R90(W)] .............................. 7-3
Supporting the motorcycle .................... 6-26
Swingarm pivots, lubricating ................. 6-22
TThrottle cable free play, adjusting ......... 6-14
Throttle grip and cable, checking
and lubricating .................................... 6-21
Tires ...................................................... 6-15
Tool kit .................................................... 6-2
Troubleshooting .................................... 6-30
Troubleshooting chart [TT-R90E(W)].... 6-32
Troubleshooting chart [TT-R90(W)] ...... 6-31VValve clearance .................................... 6-14
Vehicle identification number .................. 9-1WWheel bearings, checking..................... 6-24
Wheel (front) ......................................... 6-27
Wheel (rear) .......................................... 6-28
Wheels .................................................. 6-16
U3P281E0.book Page 1 Monday, April 17, 2006 11:26 AM