YAMAHA YBR125 2003 User Guide

CONTENTS
DESCRIPTION............................................................. 1-1
MACHINE IDENTIFICATION ....................................... 2-1
Vehicle identification number ................................. 2-1
Engine serial number ............................................ 2-1
CONTROL FUNCTIONS .............................................. 3-1
Main switch ............................................................ 3-1
Indicator lights ........................................................ 3-2
Speedometer .......................................................... 3-3
Fuel gauge ............................................................. 3-3
Handlebar switches over left .................................. 3-4
Handlebar switches over right .............................. 3-5
Clutch lever .......................... .................................. 3-6
Shift pedal ............................................................. 3-6
Front brake lever ................................................... 3-7
Rear brake pedal ................................................... 3-7
Fuel tank cap ......................................................... 3-8
Fuel cock ............................................................... 3-9
Starter lever ......................................................... 3-10
Steering lock ....................... ................................ 3-11
Seat ...................................................................... 3-12
Side covers ......................................................... 3-13
Rear shock absorber adjustment........................ 3-14
Clutch switch operation check ............................ 3-15
XIPRE-OPERATION
CHECKS........................................ 4-1
Brakes ................................................................... 4-3
Brake fluid leakage ................................................ 4-4
Engine oil ................................................................ 4-4
Tires ........................................................................\
4-5
Clutch ..................................................................... 4-8
Throttle grip ............................ ................................ 4-8
Fitting/Fasteners .................................................... 4-8
Switches ................................................................ 4-8
Wheels ......................................................... 4-8
Fuel ........................................................... 4-9
OPERATION AND IMPORT ANT RIDING POINTS....... 5-1
Starting a cold engine .................................................. 5-2
Starting a warm engine ................................................ 5-4
Warming up the engine ................................................ 5-4
Shifting ........................................................................\
.. 5-5
Engine Break-in ............................................................ 5-6
Parking ........................................................................\
.. 5-7
CONTENTS
DESCRIPTION ............................................................. 1-1
MACHINE IDENTIFICATION ....................................... 2-1
Vehicle identification number ................................. 2-1
Engine serial number ............................................ 2-1
CONTROL FUNCTIONS .............................................. 3-1
Main switch ............................................................ 3-1
Indicator lights ........................................................ 3-2
Speedometer .......................................................... 3-3
Fuel gauge ............................................................. 3-3
Handlebar switches over left .................................. 3-4
Handlebar switches over right .............................. 3-5
Clutch lever .......................... .................................. 3-6
Shift pedal ............................................................. 3-6
Front brake lever ................................................... 3-7
Rear brake pedal ................................................... 3-7
Fuel tank cap ......................................................... 3-8
Fuel cock ............................................................... 3-9
Starter lever ......................................................... 3-10
Steering lock ....................... ................................ 3-11
Seat ...................................................................... 3-12
Side covers ......................................................... 3-13
Rear shock absorber adjustment........................ 3-14
Clutch switch operation check ............................ 3-15
XIPRE-OPERATION
CHECKS........................................ 4-1
Brakes ................................................................... 4-3
Brake fluid leakage ................................................ 4-4
Engine oil ................................................................ 4-4
Tires ........................................................................\
4-5
Clutch ..................................................................... 4-8
Throttle grip ............................ ................................ 4-8
Fitting/Fasteners .................................................... 4-8
Switches ................................................................ 4-8
Wheels ......................................................... 4-8
Fuel ........................................................... 4-9
OPERATION AND IMPORT ANT RIDING POINTS....... 5-1
Starting a cold engine .................................................. 5-2
Starting a warm engine ................................................ 5-4
Warming up the engine ................................................ 5-4
Shifting ........................................................................\
.. 5-5
Engine Break-in ............................................................ 5-6
Parking ........................................................................\
.. 5-7

PERIODIC MAINTENANCE AND MINOR REPAIRS..... 6-1
Tool kit..................................................................... 6-2
PERIODIC MAINTENANCE/LUBRICATION......... 6-3
Torque specifications............................................. 6-5
Engine oil................................................................ 6-6
Oil pressure ............................................................ 6-9
Air filter .................................................................6-10
Carburetor adjustment ......................................... 6-12
Valve clearance adjustment.................................6-12
Idle speed adjustment..........................................6-13
Throttle cable adjustment....................................6-14
Spark plug inspection...........................................6-15
Rear brake adjustment ......................................... 6-16
Brake light switch adjustment ..............................6-17
Checking the front brake pads and rear brake
shoes.................................................................... 6-17
Front brake...........................................................6-18
Rear brake ............................................................ 6-18
Inspecting the brake fluid level ............................6-19
Brake fluid replacement.......................................6-20
Clutch adjustment................................................6-20
Drive chain slack check .......................................6-21
Drive chain slack adjustment...............................6-22
Drive chain lubrication..........................................6-23
Cable inspection and lubrication..........................6-23
Throttle cable and grip lubrication.......................6-24Brake and shift pedals ......................................... 6-24
Brake and clutch levers ....................................... 6-24
Sidestand ............................................................. 6-24
Front fork inspection ............................................ 6-25
Steering inspection.............................................. 6-26
Wheel bearings.................................................... 6-26
Battery.................................................................. 6-27
Replenishing the battery fluid .............................. 6-28
Fuse replacement................................................ 6-29
Headlight bulb replacement................................. 6-30
Turn signal bulb replacement.............................. 6-32
Taillight bulb replacement.................................... 6-32
Front wheel removal............................................. 6-33
Front wheel installation........................................ 6-34
Rear wheel removal............................................. 6-35
Rear wheel installation ......................................... 6-36
Troubleshooting.................................................... 6-36
Troubleshooting chart.......................................... 6-37
CLEANING AND STORAGE....................................... 7-1
CLEANING............................................................. 7-1
STORAGE.............................................................. 7-2
SPECIFICATIONS ........................................................ 8-1
XII
PERIODIC MAINTENANCE AND MINOR REPAIRS..... 6-1
Tool kit..................................................................... 6-2
PERIODIC MAINTENANCE/LUBRICATION......... 6-3
Torque specifications............................................. 6-5
Engine oil................................................................ 6-6
Oil pressure ............................................................ 6-9
Air filter .................................................................6-10
Carburetor adjustment ......................................... 6-12
Valve clearance adjustment.................................6-12
Idle speed adjustment..........................................6-13
Throttle cable adjustment....................................6-14
Spark plug inspection...........................................6-15
Rear brake adjustment ......................................... 6-16
Brake light switch adjustment ..............................6-17
Checking the front brake pads and rear brake
shoes.................................................................... 6-17
Front brake...........................................................6-18
Rear brake ............................................................ 6-18
Inspecting the brake fluid level ............................6-19
Brake fluid replacement.......................................6-20
Clutch adjustment................................................6-20
Drive chain slack check .......................................6-21
Drive chain slack adjustment...............................6-22
Drive chain lubrication..........................................6-23
Cable inspection and lubrication..........................6-23
Throttle cable and grip lubrication.......................6-24Brake and shift pedals ......................................... 6-24
Brake and clutch levers ....................................... 6-24
Sidestand ............................................................. 6-24
Front fork inspection ............................................ 6-25
Steering inspection.............................................. 6-26
Wheel bearings.................................................... 6-26
Battery.................................................................. 6-27
Replenishing the battery fluid .............................. 6-28
Fuse replacement................................................ 6-29
Headlight bulb replacement................................. 6-30
Turn signal bulb replacement.............................. 6-32
Taillight bulb replacement.................................... 6-32
Front wheel removal............................................. 6-33
Front wheel installation........................................ 6-34
Rear wheel removal............................................. 6-35
Rear wheel installation ......................................... 6-36
Troubleshooting.................................................... 6-36
Troubleshooting chart.......................................... 6-37
CLEANING AND STORAGE....................................... 7-1
CLEANING............................................................. 7-1
STORAGE.............................................................. 7-2
SPECIFICATIONS ........................................................ 8-1
XII

1-1
DESCRIPTION
01. Fuel cock
02. Starter lever
03. Battery
04. Fusible
05. Tool kit
06. Shift Pedal
07. Shock absorber
08. Air filter
09. Dispstick
10. Rear brake pedal
11. Clutch lever
12. Handlebar switches over right
13. Speedometer
14. Main switch
15. Fuel gauge
16. Front brake lever
17. Throttle
18. Handlebar switches over left
19. Fuel tank cap
1-1
DESCRIPTION
01. Fuel cock
02. Starter lever
03. Battery
04. Fusible
05. Tool kit
06. Shift Pedal
07. Shock absorber
08. Air filter
09. Dispstick
10. Rear brake pedal
11. Clutch lever
12. Handlebar switches over right
13. Speedometer
14. Main switch
15. Fuel gauge
16. Front brake lever
17. Throttle
18. Handlebar switches over left
19. Fuel tank cap

2
2-1 Vehicle identification number
The vehicle identification number is stamped into the
steering head pipe.Record this number in the space
provided.
1. Frame number 2. Production year
Engine serial number
The engine serial number is stamped on right-hand engine
crankcase.
1. Engine serial number
NOTE:
Model code is indicated by 4th to 8th
digits and serial
number is indicated by 12th to 17th digits . Record these
numbers for reference in case of ordering parts from a
Yamaha dealer.
MACHINE IDENTIFICATION


2
2-1 Vehicle identification number
The vehicle identification number is stamped into the
steering head pipe.Record this number in the space
provided.
1. Frame number 2. Production year
Engine serial number
The engine serial number is stamped on right-hand engine
crankcase.
1. Engine serial number
NOTE:
Model code is indicated by 4th to 8th
digits and serial
number is indicated by 12th to 17th digits . Record these
numbers for reference in case of ordering parts from a
Yamaha dealer.
MACHINE IDENTIFICATION




CONTROL FUNCTIONS
Main switch
The main switch controls the ignition and the electrical
system. It’s operation is described below.
ON:
Electrical circuits are switched on. Engine can be started.
The key cannot be removed.
OFF:
All electrical circuits are switched off. The key can be
removed.
LOCK:
The steering is locked and all electrical circuits are switched
off. The key can be removed. Refer to page (3-11) “Steering
lock” for instructions.
NOTE:
Always turn the main switch to “OFF” or “LOCK” and remove
the key when the motorcycle is unattended.
LOCK


CONTROL FUNCTIONS
Main switch
The main switch controls the ignition and the electrical
system. It’s operation is described below.
ON:
Electrical circuits are switched on. Engine can be started.
The key cannot be removed.
OFF:
All electrical circuits are switched off. The key can be
removed.
LOCK :
The steering is locked and all electrical circuits are switched
off. The key can be removed. Refer to page (3-11) “Steering
lock” for instructions.
NOTE:
Always turn the main switch to “OFF” or “LOCK” and remove
the key when the motorcycle is unattended.
LOCK


0
3
2
1
F
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Turn indicator lights " "
The corresponding indicator fhashes when the turn
switch is moved to the “ “ or “ “.
High beam indicator light "


"
This indicator comes on when the headlight high beam
is used.
Neutral indicator light " N "
This indicator comes on when the transmission is in
neutral. Indicator lights



 


 



 

 


0
3
2
1
F
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14013012011 01009080706050403020100
Turn indicator lights " "
The corresponding indicator fhashes when the turn
switch is moved to the “ “ or “ “.
High beam indicator light "


"
This indicator comes on when the headlight high beam
is used.
Neutral indicator light " N "
This indicator comes on when the transmission is in
neutral. Indicator lights



 


 



 

 

Fuel gauge
Speedometer


The fuel gauge indicates the quantity of the remaining
gasoline in the tank. The gauge needle moves from “F”
(Full) to “E” (Empty) as the fuel level decreases. When the
needle reaches the “RED ZONE”, refill the tank at the
earliest opportunity.
NOTE:
The fuel meter needle does not move when the main
switch is in “OFF” position.
The speedometer shows riding speed.
This speedometer is equipped with an odometer.
0
1
F
E30000
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1. Adjustind knob 2. Odometer1. Fuel gauge
0
2
1
F
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Km h
Fuel gauge
Speedometer


The fuel gauge indicates the quantity of the remaining
gasoline in the tank. The gauge needle moves from “F”
(Full) to “E” (Empty) as the fuel level decreases. When the
needle reaches the “RED ZONE”, refill the tank at the
earliest opportunity.
NOTE:
The fuel meter needle does not move when the main
switch is in “OFF” position.
The speedometer shows riding speed.
This speedometer is equipped with an odometer.
0
1
F
E30000
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1401301201101009080706050403020100
1. Adjustind knob 2. Odometer1. Fuel gauge
0
2
1
F
E3000014013012011 01009080706050403020100
Km h

Handlebar switches over left
1. Light switch 2. Pass switch
3. Dimmer switch 4. Turn signal switch
5. Horn switch
3-4LIGHTS SWITCH
Turning the light switch to “ “, turns on the meter light\
s,
headlight and tail-lights.
PASS SWITCH " "
Press the switch to operate the passing light.
Dimmer switch
Turn the switch to " " for the high beam and to " "
for the low beam.
TURN SIGNAL SWITCH " "
To signal a right-hand turn, push the switch to “ “ ; to
signal a left-hand turn, push the switch to “ “ .
Once the switch is released it will return to the center
position. To cancel the signal, push the switch in after it
has returned to the center position.
HORN SWITCH " "
Press the switch to sound the horn.
Handlebar switches over left
1. Light switch 2. Pass switch
3. Dimmer switch 4. Turn signal switch
5. Horn switch
3-4LIGHTS SWITCH
Turning the light switch to “ “, turns on the meter light\
s,
headlight and tail-lights.
PASS SWITCH " "
Press the switch to operate the passing light.
Dimmer switch
Turn the switch to " " for the high beam and to " "
for the low beam.
TURN SIGNAL SWITCH " "
To signal a right-hand turn, push the switch to “ “ ; to
signal a left-hand turn, push the switch to “ “ .
Once the switch is released it will return to the center
position. To cancel the signal, push the switch in after it
has returned to the center position.
HORN SWITCH " "
Press the switch to sound the horn.

Handlebar switches over rigt
1. “ENGINE STOP” switch, shuts the engine off 2. Starter switch
3-5“ENGINE STOP” switch
The engine stop switch is a safety device for use in an
emergency such as when the motorcycle overturns or if
trouble occurs in the throttle system. Turn the switch to
“
” to start the engine, and turn the switch to “ ” to
stop the engine.
Starter switch “ ”
The starter motor cranks the engine when pushing the
starter switch.
See starting instructions prior to starting the
engine.
CAUTION:
Handlebar switches over rigt
1. “ENGINE STOP” switch, shuts the engine off 2. Starter switch
3-5 “ENGINE STOP” switch
The engine stop switch is a safety device for use in an
emergency such as when the motorcycle overturns or if
trouble occurs in the throttle system. Turn the switch to
“
” to start the engine, and turn the switch to “ ” to
stop the engine.
Starter switch “ ”
The starter motor cranks the engine when pushing the
starter switch.
See starting instructions prior to starting the
engine.
CAUTION:

The clutch lever is located on the left handlebar, and the
starting circuit cut off switch is incorporated in the clutch
lever holder. Pull the clutch lever to the handlebar to
disengage the clutch, and release the lever to engage the
clutch. The lever should be pulled rapidly and released
slowly for smooth clutch operation.

!This motorcycle is equipped with a constant-mesh 5-speed
transmission.
The shift pedal is located on the left side of the engine and
is used in combination with the clutch when shifting.
Clutch lever
Shift pedal
1. Clutch lever1. Shift pedal
15
4
3
2
N
1
The clutch lever is located on the left handlebar, and the
starting circuit cut off switch is incorporated in the clutch
lever holder. Pull the clutch lever to the handlebar to
disengage the clutch, and release the lever to engage the
clutch. The lever should be pulled rapidly and released
slowly for smooth clutch operation.

!This motorcycle is equipped with a constant-mesh 5-speed
transmission.
The shift pedal is located on the left side of the engine and
is used in combination with the clutch when shifting.
Clutch lever
Shift pedal
1. Clutch lever1. Shift pedal
15
4
3
2
N
1