YAMAHA DT125R User Manual
OWNER’S MANUAL
DT125R
3MB-28199-E7
Welcome to the Yamaha world of motorcycling!
INTRODUCTION
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As the owner of a DT125R, you are benefiting from Yamaha’s vast experience in and newest technology for the design and the manufacture of high-quality products, which have earned Yamaha a
reputation for dependability.
Please take the time to read this manual thoroughly, so as to enjoy all your DT125R’s advantages.
The owner's manual does not only instruct you in how to operate, inspect and maintain your motorcycle, but also in how to safeguard yourself and others from trouble and injury.
In addition, the many tips given in this manual will help to keep your motorcycle in the best possible
condition. If you have any further questions, do not hesitate to contact your Yamaha dealer.
The Yamaha team wishes you many safe and pleasant rides. So, remember to put safety first!
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IMPORTANT MANUAL INFORMATION
Particularly important information is distinguished in this manual by the following notations:
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NOTE:
NOTE:
8 This manual should be considered a permanent part of this motorcycle and should remain
8 Yamaha continually seeks advancements in product design and quality. Therefore, while this
The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR SAFETY
IS INVOLVED!
Failure to follow WARNING instructions could result in severe injury or death to the
motorcycle operator, a bystander or a person inspecting or repairing the motorcycle.
A CAUTION indicates special precautions that must be taken to avoid damage to
the motorcycle.
A NOTE provides key information to make procedures easier or clearer.
with it even if the motorcycle is subsequently sold.
manual contains the most current product information available at the time of printing, there
may be minor discrepancies between your motorcycle and this manual. If there is any question concerning this manual, please consult your Yamaha dealer.
IMPORTANT MANUAL INFORMATION
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PLEASE READ THIS MANUAL CAREFULLY AND COMPLETELY BEFORE OPERATING
THIS MOTORCYCLE.
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DT125R
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OWNER’S MANUAL
© 2000 by Yamaha Motor Co., Ltd.
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1st Edition, December 2000
All rights reserved.
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Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Co., Ltd.
is expressly prohibited.
Printed in Japan.
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TABLE OF CONTENTS
GIVE SAFETY THE RIGHT OF WAY..................1-1
1
DESCRIPTION ....................................................2-1
2
Left view............................................................2-1
Right view .........................................................2-2
Controls/Instruments.........................................2-3
INSTRUMENT AND CONTROL FUNCTIONS....3-1
3
Main switch.......................................................3-1
Indicator lights...................................................3-1
Oil level indicator circuit check..........................3-2
Speedometer ....................................................3-3
Tachometer.......................................................3-3
Engine temperature gauge ...............................3-4
Handlebar switches ..........................................3-4
Clutch lever.......................................................3-5
Shift pedal.........................................................3-5
Front brake lever...............................................3-6
Rear brake pedal ..............................................3-6
Fuel tank cap ....................................................3-6
Fuel (except for Switzerland and Austria).........3-7
Fuel (for Switzerland and Austria) ....................3-7
Catalyzer (for Switzerland and Austria) ............3-8
Two-stroke engine oil........................................3-9
Fuel cock ..........................................................3-9
Starter (choke) “
1”.........................................3-10
Kick starter......................................................3-11
Steering lock...................................................3-11
Seat ................................................................3-12
Helmet holder .................................................3-12
Rear shock absorber adjustment....................3-13
Rear carrier.....................................................3-14
Note on handling of the Yamaha Energy
Induction System (Y.E.I.S.).............................3-14
Y.P.V.S.
(Yamaha Power Valve System)......................3-15
Sidestand........................................................3-15
Sidestand switch operation check ..................3-16
PRE-OPERATION CHECKS...............................4-1
4
Pre-operation check list ....................................4-1
OPERATION AND IMPORTANT RIDING
5
POINTS................................................................5-1
Starting the engine............................................5-1
Starting a warm engine.....................................5-3
Shifting..............................................................5-4
Recommended shift points
(for Switzerland only)........................................5-4
Tips for reducing fuel consumption...................5-5
Engine break-in.................................................5-5
Parking..............................................................5-6
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TABLE OF CONTENTS
PERIODIC MAINTENANCE AND MINOR
6
REPAIR................................................................6-1
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2
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5
6
7
8
9
Tool kit ..............................................................6-1
Periodic maintenance and lubrication chart......6-3
Cowling removal and installation ......................6-6
Cowling A..........................................................6-6
Cowling B..........................................................6-7
Cowling C .........................................................6-8
Panel removal and installation..........................6-8
Panel D.............................................................6-9
Panel E .............................................................6-9
Spark plug.......................................................6-10
Transmission oil..............................................6-11
Cooling system ...............................................6-12
Changing the coolant......................................6-13
Air filter............................................................6-15
Carburetor adjustment....................................6-16
Idle speed adjustment.....................................6-17
Throttle cable free play adjustment.................6-17
Tires................................................................6-18
Wheels............................................................6-20
Clutch lever free play adjustment ...................6-21
Front brake lever free play adjustment ...........6-21
Rear brake pedal height adjustment...............6-22
Brake light switch adjustment .........................6-23
Checking the front and rear brake pads .........6-23
Inspecting the brake fluid level .......................6-24
Brake fluid replacement..................................6-25
Drive chain slack check ..................................6-25
Drive chain slack adjustment..........................6-26
Drive chain lubrication ....................................6-26
Cable inspection and lubrication.....................6-27
Throttle cable and grip lubrication...................6-27
Autolube pump adjustment.............................6-28
Brake and shift pedal lubrication.....................6-28
Brake and clutch lever lubrication...................6-28
Sidestand lubrication ......................................6-29
Front fork inspection .......................................6-29
Steering inspection .........................................6-30
Wheel bearings...............................................6-30
Battery ............................................................6-31
Fuse replacement...........................................6-33
Headlight bulb replacement............................6-33
Turn signal light bulb replacement..................6-35
Tail/brake light bulb replacement....................6-35
Supporting the motorcycle..............................6-36
Front wheel removal .......................................6-36
Front wheel installation...................................6-37
Rear wheel removal........................................6-38
Rear wheel installation....................................6-39
Troubleshooting..............................................6-39
Troubleshooting chart.....................................6-40
MOTORCYCLE CARE AND STORAGE .............7-1
7
Care..................................................................7-1
Storage .............................................................7-4
SPECIFICATIONS...............................................8-1
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How to use the conversion table.......................8-5
TABLE OF CONTENTS
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CONSUMER INFORMATION..............................9-1
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Identification number records ...........................9-1
Key identification number .................................9-1
Vehicle identification number............................9-1
Model label .......................................................9-2
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GIVE SAFETY THE RIGHT OF WAY
Motorcycles are fascinating vehicles, which can give you an unsurpassed feeling of power and freedom. However, they also impose certain limits, which you must accept; even the best motorcycle
does not ignore the laws of physics.
Regular care and maintenance are essential for preserving your motorcycle’s value and operating
condition. Moreover, what is true for the motorcycle is also true for the rider: good performance
depends on being in good shape. Riding under the influence of medication, drugs and alcohol is, of
course, out of the question. Motorcycle riders - more than car drivers - must always be at their mental
and physical best. Under the influence of even small amounts of alcohol, there is a tendency to take
dangerous risks.
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Protective clothing is as essential for the motorcycle rider as seat belts are for car drivers and passengers. Always wear a complete motorcycle suit (whether made of leather or tear-resistant synthetic
materials with protectors), sturdy boots, motorcycle gloves and a properly fitting helmet. Optimum protective wear, however, should not encourage carelessness. Though full-coverage helmets and suits,
in particular, create an illusion of total safety and protection, motorcyclists will always be vulnerable.
Riders who lack critical self-control run the risk of going too fast and are apt to take chances. This is
even more dangerous in wet weather. The good motorcyclist rides safely, predictably and defensively
- avoiding all dangers, including those caused by others.
Enjoy your ride!
1-1
DESCRIPTION
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Left view
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1. Headlight (page 6-33)
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2. Radiator cap (page 6-13)
3. Fuel cock (page 3-9)
4. Air filter (page 6-15)
5. Coolant reservoir tank (page 6-13)
6. Helmet holder (page 3-12)
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7. Starter (choke) (page 3-10)
8. Shift pedal (page 3-5, 5-4)
9. Y.E.I.S. (page 3-14)
10. Y.P.V.S. (page 3-15)
2-1
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Right view
DESCRIPTION
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2
3
4
11. Tool kit (page 6-1)
12. Fuse (page 6-33)
13. Engine oil tank (page 3-9)
14. Rear brake pedal (page 3-6, 6-22)
15. Rear shock absorber spring
preload adjusting nut (page 3-13)
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2-2
DESCRIPTION
16 17 18 19 20 21 22
2324
25
Controls/Instruments
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2
3
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16. Clutch lever (page 3-5, 6-21)
17. Left handlebar switches (page 3-4)
18. Speedometer (page 3-3)
19. Coolant temperature gauge (page 3-4)
20. Tachometer (page 3-3)
21. Right handlebar switches (page 3-5)
22. Front brake lever (page 3-6, 6-27)
23. Throttle grip (page 6-17, 6-27)
24. Fuel tank cap (page 3-6)
25. Main switch (page 3-1)
2-3
ON
OFF
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INSTRUMENT AND CONTROL FUNCTIONS
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High beam indicator light “&”
This indicator comes on when the
headlight high beam is used.
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Main switch
The main switch controls the ignition
and lighting systems. Its operation is
described below.
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ON
Electrical circuits are switched on.
The engine can be started. The key
cannot be removed in this position.
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OFF
All electrical circuits are switched off.
The key can be removed in this position.
1. Turn indicator light “5”
2. High beam indicator light “&”
3. Neutral indicator light “N”
4. Oil level indicator light “7”
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Indicator lights
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Turn indicator light “5”
This indicator flashes when the turn
switch is moved to the left or right.
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Neutral indicator light “N”
This indicator comes on when the
transmission is in neutral.
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Oil level indicator light “7”
This indicator comes on when the oil
level is low. This light circuit can be
checked by the procedure on page 3-
2.
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Do not run the motorcycle until
you know it has sufficient engine
oil.
NOTE
Even if the oil is filled to the specified
level, the indicator light may flicker
when riding on a slope or during sudden acceleration or deceleration, but
this is normal.
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3-1
INSTRUMENT AND CONTROL FUNCTIONS
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Oil level indicator circuit check
1
Turn the main switch to “ON”.
2
Put the transmission in neutral.
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Oil level indicator light
does not come on.
Ask a Yamaha dealer to
inspect electrical circuit.
Oil level indicator light
comes on.
Shift into gear.
Oil level indicator light
does not come on.
Engine oil level and
electrical circuit are OK.
Go ahead with riding.
3-2
Oil level indicator light
comes on.
Supply engine oil.
INSTRUMENT AND CONTROL FUNCTIONS
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1
NOTE:
(for German model equipped with
speed limiter only)
This motorcycle is equipped with a
speed limiter which prevents it from
exceeding a top speed of
80 km/h.
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1. Speedometer
2. Odometer
3. Trip odometer
4. Reset knob
Speedometer
The speedometer shows riding
speed. This speedometer is equipped
with an odometer and trip odometer.
The trip odometer can be reset to “0”
with the reset knob. Use the trip
odometer to estimate how far you
can ride on a tank of fuel. This information will enable you to plan fuel
stops in the future.
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3-3
1. Tachometer
2. Red zone
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Tachometer
This model is equipped with a
tachometer so the rider can monitor
the engine speed and keep it within
the ideal power range.
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Do not operate in the red zone.
Red zone: 10,500 r/min and above
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INSTRUMENT AND CONTROL FUNCTIONS
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1. Coolant temperature gauge
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2. Red zone
Coolant temperature gauge
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This gauge indicates the coolant temperature when the main switch is on.
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The engine operating temperature
will vary with changes in weather and
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engine load. If the needle points to
the red zone or higher, stop your
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motorcycle and let the engine cool.
(See page 6-13 for details.)
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When the engine is overheated, do
not continue riding.
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1. Lights switch
2. Dimmer switch
3. Turn signal switch
4. Horn switch “*”
Handlebar switches
Lights switch
Turning the light switch to “'”,
turns on the auxiliary light, meter
lights and taillight. Turning the light
switch to “:”, turns the headlight on
also.
Dimmer switch
Turn the switch to “&” for the high
beam and to “%” for the low beam.
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Turn signal switch
To signal a right-hand turn, push the
switch to “6”. To signal a left-hand
turn, push the switch to “4”. 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.
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Horn switch “*”
Press the switch to sound the horn.
3-4
INSTRUMENT AND CONTROL FUNCTIONS
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N
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1. Engine stop switch
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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. In case of emergency,
turn the switch to “$” to stop the
engine.
1. Clutch lever
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Clutch lever
The clutch lever is located on the left
handlebar. 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.
3-5
1. Shift pedal
N. Neutral
EAU00157
Shift pedal
This motorcycle is equipped with a
constant-mesh 6-speed transmission.
The shift pedal is located on the left
side of the engine and is used in
combination with the clutch when
shifting.
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INSTRUMENT AND CONTROL FUNCTIONS
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3
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2
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2
3
1. Front brake lever
4
Front brake lever
The front brake lever is located on
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the right handlebar. Pull it toward the
handlebar to apply the front brake.
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1. Rear brake pedal
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Rear brake pedal
The rear brake pedal is on the right
side of the motorcycle. Press down
on the brake pedal to apply the rear
brake.
3-6
1. Fuel tank cap
2. Unlock
3. Open
EAU00177
Fuel tank cap
To open
Insert the key and turn it 1/4 turn
counterclockwise. Turn the cap 1/3
turn counterclockwise and remove it
from the tank.
To close
Put the cap in the filler neck and turn
it 1/3 turn clockwise. Lock the cap by
turning the key 1/4 turn clockwise,
and remove the key.
NOTE:
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2
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4
The tank cap cannot be reinstalled
unless it is unlocked. The key must
remain in the cap until the cap is
properly installed and locked onto the
fuel tank.
INSTRUMENT AND CONTROL FUNCTIONS
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Be sure the cap is properly
installed and locked in place
before riding the motorcycle.
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1. Filler tube
2. Fuel level
EAU01183
Fuel
(except for Switzerland and
Austria)
Make sure there is sufficient fuel in
the tank. Fill the fuel tank to the bottom of the filler tube as shown in the
illustration.
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Do not overfill the fuel tank. Avoid
spilling fuel on the hot engine. Do
not fill the fuel tank above the bottom of the filler tube or it may
overflow when the fuel heats up
later and expands.
3-7
1. Filler tube
2. Filling nozzle
3. Leaf valve
4. Fuel level
EAU01184
Fuel
(for Switzerland and Austria)
Make sure there is sufficient fuel in
the tank. When refueling, be sure to
insert the filling nozzle into the filler
hole and fill the tank to the bottom of
the filler tube as shown in the illustration.
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INSTRUMENT AND CONTROL FUNCTIONS
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Do not overfill the fuel tank. Avoid
1
spilling fuel on the hot engine. Do
not fill the fuel tank above the bot-
2
tom of the filler tube or it may
overflow when the fuel heats up
later and expands.
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Always wipe off spilled fuel imme-
5
diately with a dry and clean soft
cloth. Fuel may deteriorate painted
6
surfaces or plastic parts.
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EW000130
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EAU00191
Recommended fuel:
Regular unleaded gasoline
with a research octane
number of 91 or higher.
Fuel tank capacity:
Total:
10.0 L
Reserve:
1.8 L
NOTE:
If knocking or pinging occurs, use a
different brand of gasoline or higher
octane grade.
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Catalyzer
(for Switzerland and Austria)
This motorcycle is equipped with a
catalytic converter in the exhaust
chamber.
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The exhaust system is hot during
and directly after engine operation.
Make sure the exhaust system has
cooled down before making any
adjustment to or lubricating the
motorcycle.
3-8
INSTRUMENT AND CONTROL FUNCTIONS
RES
ON
FUEL
OFF
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The following must be observed to
prevent a fire hazard or other damages.
88
Use only unleaded gasoline.
Use of leaded gasoline will
cause unrepairable damage to
the catalytic converter.
88
Never park this motorcycle in
an area that would cause a fire
hazard such as grass or other
materials that may easily burn.
88
Do not allow the engine to idle
for very long.
EC000114
1. Oil tank cap
2. Stopper
EAU02956
Two-stroke engine oil
Make sure there is sufficient twostroke engine oil in the oil tank. Add
the recommended oil as necessary.
Recommended oil:
Yamalube 2 or 2-stroke
engine oil (JASO FC grade or
ISO EG-C, EG-D grade)
Oil quantity:
1.2 L
3-9
OFF: closed position
1. Arrow mark positioned “OFF”
EAU03050
Fuel cock
The fuel cock supplies fuel from the
tank to the carburetor while filtering it
also.
The fuel cock has three positions:
OFF
With the lever in this position, fuel will
not flow. Always return the lever to
this position when the engine is not
running.
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INSTRUMENT AND CONTROL FUNCTIONS
ON
FUEL
RES
OFF
1
ON
OFF
ON
FUEL
RES
1
RES
ON: normal position
1
2
3
1. Arrow mark positioned “ON”
4
ON
With the lever in this position, fuel
5
flows to the carburetor. Normal riding
is done with the lever in this position.
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RES: reserve position
1. Arrow mark positioned “RES”
RES
This indicates reserve. If you run out
of fuel while riding, move the lever to
this position. Fill the tank at the first
opportunity. Be sure to set the lever
back to “ON” after refueling!
3-10
a
b
1. Starter (choke) “1”
1
EAU02976
Starter (choke) “1”
Starting a cold engine requires a richer air-fuel mixture. A separate starter
circuit supplies this mixture.
Move in direction a to turn on the
starter (choke).
Move in direction b to turn off the
starter (choke).
INSTRUMENT AND CONTROL FUNCTIONS
1
1
To unlock the steering
Insert the key, push it in and turn it
1/8 turn counterclockwise so that it
moves out. Then, release and
remove the key.
1
2
3
1. Kick starter
EAU00212
Kick starter
Rotate the kick starter away from the
engine. Push the starter down lightly
with your foot until the gears engage,
then kick smoothly and forcefully to
start the engine. This model has a
primary-coupled kick starter so the
engine can be started in any gear if
the clutch is disengaged. However,
shifting to neutral before starting is
recommended.
1. Steering lock
EAU02934
Steering lock
To lock the steering
Turn the handlebars all the way to
the right and open the steering lock
cover.
Insert the key and turn it 1/8 turn
counterclockwise. Then, push the key
in while turning the handlebars slightly to the left and turn the key 1/8 turn
clockwise.
Check that the steering is locked,
remove the key and close the lock
cover.
3-11
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5
6
7
8
9
INSTRUMENT AND CONTROL FUNCTIONS
1
1
1
2
3
1. Bolt (×2)
4
Seat
5
To remove
1. Remove panels D and E. (See
6
7
8
9
page 6-9 for panel removal and
installation procedures.)
2. Remove the seat bolts and lift
the seat upward.
EAU01648
To install
1. Insert the projections on the front
of the seat into the holders, then
tighten the seat bolts.
2. Install the panels.
NOTE:
Make sure that the seat is securely
fitted.
3-12
1. Open
EAU00261
Helmet holder
To open the helmet holder, insert the
key in the lock and turn it as shown.
To lock the helmet holder, turn the
key to its original position.
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Never ride with a helmet in the helmet holder. The helmet may hit
objects, causing loss of control
and possibly an accident.
INSTRUMENT AND CONTROL FUNCTIONS
b
a
2
1
“A”
3. Tighten the locknut to the specified torque.
1. Locknut
2. Adjusting nut
EAU01650
Rear shock absorber
adjustment
This shock absorber is equipped with
a spring preload adjuster. Adjust
spring preload as follows.
1. Loosen the locknut.
2. Turn the adjusting nut in direction a to increase spring preload
and in direction b to decrease
spring preload. The spring preload is determined by the spring
set length.
Shortening the spring set length
increases spring preload, lengthening the spring set length
decreases spring preload.
Spring preload:
Minimum (soft):
Distance “A” = 235 mm
Standard:
Distance “A” = 230 mm
Maximum (hard):
Distance “A” = 220 mm
EC000015
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Never attempt to turn an adjuster
beyond the maximum or minimum
setting.
3-13
Tightening torque:
Locknut:
55 Nm (5.5 m0kg)
EC000018
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Always tighten the locknut against
the spring adjusting nut and tighten the locknut to the specified
torque.
1
2
3
4
5
6
7
8
9
INSTRUMENT AND CONTROL FUNCTIONS
1
2
1
EAU00315
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This shock absorber contains
1
highly pressurized nitrogen gas.
Read and understand the following
2
information before handling the
shock absorber. The manufacturer
cannot be held responsible for
3
property damage or personal
injury that may result from improp-
4
er handling.
88
5
6
Do not tamper with or attempt
to open the cylinder assembly.
88
Do not subject the shock
absorber to an open flame or
other high heat source. This
7
may cause the unit to explode
due to excessive gas pres-
8
9
sure.
88
Do not deform or damage the
cylinder in any way. Cylinder
damage will result in poor
damping performance.
88
Take your shock absorber to a
Yamaha dealer for any service.
1. Rear carrier
Rear carrier
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Do not exceed the load limit of
2 kg.
EAU00320
EW000032
1. Air chamber
2. Hose
EAU00325
Note on handling of the
Yamaha Energy Induction
System (Y.E.I.S.)
Handle the air chamber and hose
with special care. Improper installation or damaged parts will result in
poor performance. Replace any
cracked or damaged parts immediately. No modification of this system
in any form can be made.
EC000022
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Never attempt to modify the
Yamaha Energy Induction System.
3-14
INSTRUMENT AND CONTROL FUNCTIONS
1
1. Y.P.V.S.
EAU00326
Y.P.V.S. (Yamaha Power
Valve System)
The Y.P.V.S. is a vital part of the
engine and requires very sophisticated adjustment. Adjustment should be
left to a Yamaha dealer who has the
professional knowledge and experience to do so.
EC000023
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The Y.P.V.S. was set at the
Yamaha factory after many tests. If
the settings are disturbed by
someone without sufficient technical knowledge, poor engine performance and damage may result.
The Y.P.V.S. operation can be heard
in the following instances:
8 When the main switch is turned
on and the engine is started.
8 When the engine stalls while the
main switch is on.
EC000024
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If the Y.P.V.S. does not operate,
ask a Yamaha dealer to inspect the
vehicle.
EAU00330
Sidestand
This model is equipped with an ignition circuit cut-off system. The motorcycle must not be ridden when the
sidestand is down. The sidestand is
located on the left side of the frame.
(Refer to page 5-1 for an explanation
of this system.)
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