TABLE OF CONTENTSSAFETY INFORMATION ..................1-1
Safe riding ......................................1-1
Location of important labels ............1-4
DESCRIPTION ..................................2-1
Left view ..........................................2-1
Right view ........................................2-2
Controls and instruments.................2-3
INSTRUMENT AND CONTROL
FUNCTIONS.......................................3-1
Main switch .....................................3-1
Handlebar switches ........................3-1
Shift pedal .......................................3-2
Brake lever .....................................3-2
Brake pedal ....................................3-2
Fuel tank cap ..................................3-3
Fuel .................................................3-3
Fuel tank breather hose ..................3-4
Fuel cock ........................................3-5
Starter (choke) lever .......................3-6
Kickstarter .......................................3-6
Seat ................................................3-6
Sidestand ........................................3-7
Starting circuit cut-off system .........3-7
PRE-OPERATION CHECKS..............4-1
Pre-operation check list ..................4-2OPERATION AND IMPORTANT
RIDING POINTS................................. 5-1
Starting and warming up a cold
engine ......................................... 5-1
Starting a warm engine .................. 5-2
Shifting ........................................... 5-2
Engine break-in .............................. 5-3
Parking ........................................... 5-4
PERIODIC MAINTENANCE AND
MINOR REPAIR................................. 6-1
PERIODIC MAINTENANCE ........... 6-1
Owner’s tool kit ............................... 6-2
Periodic maintenance chart for
the emission control system ....... 6-3
General maintenance and
lubrication chart .......................... 6-4
Removing and installing panels ..... 6-6
Checking the spark plug ................. 6-7
Engine oil ....................................... 6-8
Cleaning the air filter element ...... 6-10
Cleaning the spark arrester .......... 6-12
Adjusting the carburetor ............... 6-13
Adjusting the engine idling
speed ........................................ 6-13
Checking the throttle cable free
play ........................................... 6-14
Valve clearance ............................ 6-14
Tires ............................................. 6-15
Spoke wheels ............................... 6-16Accessories and replacement
parts ......................................... 6-16
Adjusting the clutch free play ....... 6-17
Adjusting the brake lever free
play ........................................... 6-17
Adjusting the brake pedal free
play ........................................... 6-18
Checking the shift pedal .............. 6-19
Checking the front and rear brake
shoes ........................................ 6-19
Drive chain slack .......................... 6-20
Cleaning and lubricating the
drive chain ................................ 6-21
Checking and lubricating the
cables ....................................... 6-22
Checking and lubricating the
throttle grip and cable ............... 6-22
Checking and lubricating the
brake lever ................................ 6-23
Checking and lubricating the
brake pedal ............................... 6-23
Checking and lubricating the
sidestand .................................. 6-23
Lubricating the swingarm
pivots ........................................ 6-24
Checking the front fork ................. 6-24
Checking the steering .................. 6-25
Checking the wheel bearings ....... 6-25
Battery ......................................... 6-26
Replacing the fuse ....................... 6-27
Supporting the motorcycle ........... 6-28U5B680E0.book Page 1 Tuesday, July 17, 2007 9:11 AM
DESCRIPTION
2-1
2
EAU10410
Left view
6 7 8123 4
5
1. Fuel cock (page 3-5)
2. Starter (choke) lever (page 3-6)
3. Fuse (page 6-27)
4. Battery (page 6-26)
5. Clutch adjusting screw (page 6-17)
6. Engine oil drain bolt (page 6-8)
7. Shift pedal (page 3-2)
8. Throttle stop screw (page 6-13)
U5B680E0.book Page 1 Tuesday, July 17, 2007 9:11 AM
PERIODIC MAINTENANCE AND MINOR REPAIR
6-26
6
EAU23390
Battery The battery is located behind panel B.
(See page 6-6.)
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.
To charge the battery
Have a Yamaha dealer charge the bat-
tery as soon as possible if it seems to
have discharged. Keep in mind that thebattery tends to discharge more quickly
if the vehicle is equipped with optional
electrical accessories.
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 store the battery
1. If the model will not be used for
more than one month, remove the
battery, fully charge it, and then
place it in a cool, dry place.
2. If the battery will be stored for more
than two months, check it at least
once a month and fully charge it if
necessary.
3. Fully charge the battery before in-
stallation.
4. After installation, make sure that
the battery leads are properly con-
nected to the battery terminals.
CAUTION:
ECA10630
Always keep the battery
charged. Storing a discharged
battery can cause permanent
battery damage.
To charge a sealed-type (MF)
battery, a special (constant-volt-
age) battery charger is required.
Using a conventional battery
1. Battery coupler
2. Battery band
3. Battery
2
3
1
U5B680E0.book Page 26 Tuesday, July 17, 2007 9:11 AM
PERIODIC MAINTENANCE AND MINOR REPAIR
6-27
6 charger will damage the battery.
If you do not have access to a
sealed-type (MF) battery charg-
er, have a Yamaha dealer
charge your battery.
EAU42021
Replacing the fuse The fuse is located inside the battery
coupler. (See page 6-26.)
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.
1. Fuse
2. Spare fuse
Specified fuse:
10.0 A
1
2
U5B680E0.book Page 27 Tuesday, July 17, 2007 9:11 AM
PERIODIC MAINTENANCE AND MINOR REPAIR
6-32
6
EAU25901
Troubleshooting chart
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.
U5B680E0.book Page 32 Tuesday, July 17, 2007 9:11 AM
MOTORCYCLE CARE AND STORAGE
7-4
7
WARNING
EWA10950
To prevent damage or injury from
sparking, make sure to ground the
spark plug electrodes while turningthe engine over.
6. Lubricate all control cables and the
pivoting points of all levers and
pedals as well as of the side-
stand/centerstand.
7. Check and, if necessary, correct
the tire air pressure, and then lift
the motorcycle so that both of its
wheels are off the ground. Alterna-
tively, turn the wheels a little every
month in order to prevent the tires
from becoming degraded in one
spot.
8. Cover the muffler outlet with a
plastic bag to prevent moisture
from entering it.
9. Remove the battery and fully
charge it. Store it in a cool, dry
place and charge it once a month.
Do not store the battery in an ex-
cessively cold or warm place [less
than 0 °C (30 °F) or more than 30°C (90 °F)]. For more information
on storing the battery, see page
6-26.
NOTE:Make any necessary repairs beforestoring the motorcycle.
U5B680E0.book Page 4 Tuesday, July 17, 2007 9:11 AM
SPECIFICATIONS
8-2
8
Transmission:Primary reduction system:
Spur gear
Primary reduction ratio:
67/18 (3.722)
Secondary reduction system:
Chain drive
Secondary reduction ratio:
35/14 (2.500)
Transmission type:
Constant mesh 4-speed
Operation:
Left foot operation
Gear ratio:
1st:
38/12 (3.166)
2nd:
33/17 (1.941)
3rd:
29/21 (1.380)
4th:
23/21 (1.095)Chassis:Frame type:
Steel tube backbone
Caster angle:
26.00 °
Trail:
60.0 mm (2.36 in)Front tire:Type:
With tube
Size:
2.50-14 4PRManufacturer/model:
CHEN SHIN/C-803
Rear tire:Type:
With tube
Size:
3.00-12 4PR
Manufacturer/model:
CHEN SHIN/C-803Loading:Maximum rider weight:
60.0 kg (132 lb)Tire air pressure (measured on cold
tires):
Front:
100 kPa (15 psi) (1.00 kgf/cm²)
Rear:
100 kPa (15 psi) (1.00 kgf/cm²)
Front wheel:Wheel type:
Spoke wheel
Rim size:
14x1.40Rear wheel:Wheel type:
Spoke wheel
Rim size:
12x1.60Front brake:Type:
Drum brake
Operation:
Right hand operation
Rear brake:Type:
Drum brake
Operation:
Right foot operationFront suspension:Type:
Telescopic fork
Spring/shock absorber type:
Coil spring/oil damper
Wheel travel:
115.0 mm (4.53 in)Rear suspension:Type:
Swingarm (monocross)
Spring/shock absorber type:
Coil spring/gas-oil damper
Wheel travel:
110.0 mm (4.33 in)Electrical system:Ignition system:
DC. CDI
Charging system:
AC magnetoBattery:Model:
GT4B-5
Voltage, capacity:
12 V, 2.5 AhFuse:Fuse:
10.0 A
U5B680E0.book Page 2 Tuesday, July 17, 2007 9:11 AM
INDEX
AAccessories and replacement parts ..... 6-16
Air filter element, cleaning .................... 6-10BBattery .................................................. 6-26
Brake lever ............................................. 3-2
Brake lever, checking and lubricating ... 6-23
Brake lever free play, adjusting ............ 6-17
Brake pedal ............................................ 3-2
Brake pedal, checking and
lubricating ........................................... 6-23
Brake pedal free play, adjusting ........... 6-18
Brake shoes, checking ......................... 6-19CCables, checking and lubricating .......... 6-22
Carburetor, adjusting ............................ 6-13
Care ........................................................ 7-1
Clutch free play, adjusting .................... 6-17DDrive chain, cleaning and lubricating .... 6-21
Drive chain slack .................................. 6-20EEngine break-in ...................................... 5-3
Engine idling speed .............................. 6-13
Engine oil ................................................ 6-8
Engine, starting a warm .......................... 5-2
Engine stop switch.................................. 3-1FFront fork, checking .............................. 6-24
Fuel......................................................... 3-3
Fuel cock ................................................ 3-5
Fuel tank breather hose.......................... 3-4
Fuel tank cap .......................................... 3-3
Fuse, replacing ..................................... 6-27
HHandlebar switches ................................. 3-1IIdentification numbers ............................. 9-1KKey identification number ........................ 9-1
Kickstarter ............................................... 3-6LLabels, location of ...................................1-4MMain switch ............................................. 3-1
Maintenance and lubrication, periodic..... 6-4
Maintenance, emission control system ... 6-3
Maintenance, periodic ............................. 6-1
Matte color, caution .................................7-1
Model label .............................................. 9-2PPanels, removing and installing .............. 6-6
Parking ....................................................5-4
Part locations .......................................... 2-1
Pre-operation check list........................... 4-2SSafety information ...................................1-1
Seat ......................................................... 3-6
Shifting ....................................................5-2
Shift pedal ............................................... 3-2
Shift pedal, checking ............................. 6-19
Sidestand ................................................ 3-7
Sidestand, checking and lubricating...... 6-23
Spark arrester, cleaning ........................ 6-12
Spark plug, checking ...............................6-7
Specifications .......................................... 8-1
Starter (choke) lever................................ 3-6Starting and warming up a cold
engine ................................................... 5-1
Starting circuit cut-off system.................. 3-7
Start switch ............................................. 3-1
Steering, checking ................................ 6-25
Storage ................................................... 7-3
Supporting the motorcycle .................... 6-28
Swingarm pivots, lubricating ................. 6-24
TThrottle cable free play, checking ......... 6-14
Throttle grip and cable, checking and
lubricating ........................................... 6-22
Tires ...................................................... 6-15
Tool kit .................................................... 6-2
Troubleshooting .................................... 6-31
Troubleshooting chart ........................... 6-32VValve clearance .................................... 6-14
Vehicle identification number .................. 9-1WWheel bearings, checking..................... 6-25
Wheel (front) ......................................... 6-28
Wheel (rear) .......................................... 6-30
Wheels .................................................. 6-16
U5B680E0.book Page 1 Tuesday, July 17, 2007 9:11 AM