2005 YAMAHA DT125R Owners Manual

1D0-F8199-E2
DT125R
DT125X
OWNER’S MANUAL
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EAU10100
Welcome to the Yamaha world of motorcycling!
As the owner of the DT125R/X, you are benefiting from Yamaha’s vast experience and newest technology regarding the
design and 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 advantages of your DT125R/X. The owner’s
manual does not only instruct you in how to operate, inspect and maintain your motorcycle, but also in how to safe-
guard yourself and others from trouble and injury.
In addition, the many tips given in this manual will help 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!
INTRODUCTION
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EAU10150
Particularly important information is distinguished in this manual by the following notations:
IMPORTANT MANUAL INFORMATION
CAUTION A CAUTION indicates special precautions that must be taken to avoid damage to
the motorcycle.
NOTE:A NOTE provides key information to make procedures easier or clearer.
NOTE:
This manual should be considered a permanent part of this motorcycle and should remain with it even if the
motorcycle is subsequently sold.
Yamaha continually seeks advancements in product design and quality. Therefore, while this 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 you have any questions concerning this manual, please consult your Yamaha dea-
ler.
EWA10030
s s
WARNING
PLEASE READ THIS MANUAL CAREFULLY AND COMPLETELY BEFORE OPERATING THIS MOTORCYCLE.
s s
WARNINGFailure to follow WARNING instructions could result in severe injury or death to the
motorcycle operator, a bystander, or a person inspecting or repairing the motorcy-
cle.
The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS
INVOLVED!t
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EAUS1171
IMPORTANT MANUAL INFORMATION
DT125R/X
OWNER’S MANUAL
©2004 by YAMAHA MOTOR SPAIN S.A.
1st edition, July 2004
All rights reserved
Any reprinting or unauthorized use
without the written permission of
YAMAHA MOTOR SPAIN S.A.
is expressly prohibited.
Printed in Spain.
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SAFETY INFORMATION.....................1-1
DESCRIPTION.....................................2-1
Left view ...........................................2-1
Right view .........................................2-2
Controls and instruments .................2-3
INSTRUMENTS AND CONTROL
FUNCTIONS........................................3-1
Main switch/steering lock .................3-1
Indicator and warning lights .............3-2
Speedometer unit .............................3-3
Handlebar switches ..........................3-3
Clutch lever .......................................3-4
Shift pedal.........................................3-4
Brake lever ........................................3-5
Brake pedal.......................................3-5
Fuel tank cap ....................................3-5
Catalytic converter............................3-6
2-stroke engine oil ............................3-7
Fuel cock ..........................................3-7
Starter (choke) lever..........................3-8
Seat...................................................3-8
Shock absorber ................................3-9
YEIS handling precautions ...............3-9
YPVS .................................................3-9
Sidestand ........................................3-10
Ignition circuit cut-off system .........3-10
PRE-OPERATION CHECKS...............4-1
Pre-operation check list....................4-2OPERATION AND IMPORTANT RIDING
POINTS................................................5-1
Starting a cold engine ......................5-1
Starting a warm engine ....................5-2
Shifting ..............................................5-2
Engine break-in.................................5-2
Parking ..............................................5-3
PERIODIC MAINTENANCE AND
MINOR REPAIR...................................6-1
Owner’s tool kit .................................6-1
Periodic maintenance and
lubrication chart ............................6-2
Removing and installing cowlings
and panels .....................................6-5
Checking the spark plug ..................6-6
Transmission oil ................................6-7
Coolant .............................................6-8
Cleaning the air filter element
and check hose ...........................6-10
Ajusting the carburetor ...................6-11
Adjusting the engine idling
speed...........................................6-12
Ajusting the throttle cable free
play ..............................................6-12
Tires ................................................6-13
Spoke wheels .................................6-15
Adjusting the clutch lever free
play ..............................................6-15
Adjusting the brake lever free
play ..............................................6-16Adjusting the brake pedal position
and free play................................6-17
Adjusting the rear brake light
switch ..........................................6-17
Checking the front and rear
brake pads ..................................6-18
Changing the brake fluid ................6-19
Checking the drive chain slack ......6-19
Adjusting the drive chain slack.......6-20
Lubricating the drive chain .............6-20
Checking and lubricating the
cables ..........................................6-21
Checking and lubricating the
throttle grip and cable .................6-21
Adjusting the autolube pump .........6-21
Checking and lubricating the
brake and shift pedals.................6-21
Checking and lubricating the
breake and clutch levers .............6-21
Checking and lubricating the
sidestand .....................................6-21
Checking the front fork ...................6-22
Checking the steering.....................6-22
Checking the wheel bearings .........6-23
Replacing the fuse ..........................6-24
Replacing the headlight bulb..........6-24
Replacing the tail/brake light
bulb .............................................6-25
Replacing the turn signal light
bulb .............................................6-26
Supporting the motorcycle .............6-26
TABLE OF CONTENTS
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Front wheel .....................................6-26
Rear wheel ......................................6-28
Troubleshooting ..............................6-29
MOTORCYCLE CARE AND
STORAGE........................................7-1
Care ..................................................7-1
Storage .............................................7-3
SPECIFICATIONS...............................8-1
Specifications ...................................8-1
CONSUMER INFORMATION.............9-1
Identification numbers ......................9-1
TABLE OF CONTENTS
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EAU10310
MOTORCYCLES ARE SINGLE
TRACK VEHICLES. THEIR SAFE USE
AND OPERATION ARE DEPENDENT
UPON THE USE OF PROPER RIDING
TECHNIQUES AS WELL AS THE
EXPERTISE OF THE OPERATOR.
EVERY OPERATOR SHOULD KNOW
THE FOLLOWING REQUIREMENTS
BEFORE RIDING THIS MOTORCY-
CLE.
HE OR SHE SHOULD:
 OBTAIN THOROUGH INSTRUC-
TIONS FROM A COMPETENT
SOURCE ON ALL ASPECTS OF
MOTORCYCLE OPERATION.
OBSERVE THE WARNINGS AND
MAINTENANCE REQUIRE-
MENTS IN THE OWNER’S
MANUAL.
OBTAIN QUALIFIED TRAINING
IN SAFE AND PROPER RIDING
TECHNIQUES.
OBTAIN PROFESSIONAL TECH-
NICAL SERVICE AS INDICATED
BY THE OWNER’S MANUAL
AND/OR WHEN MADE NECES-
SARY BY MECHANICAL CONDI-
TIONS.Safe riding
Always make pre-operation
checks. Careful checks may help
prevent an accident.
This motorcycle is designed to
carry the operator and a passen-
ger.
The failure of motorists to detect
and recognize motorcycles in
traffic is the predominating cause
of automobile/motorcycle acci-
dents. Many accidents have
been caused by an automobile
driver who did not see the
motorcycle. Making yourself
conspicuous appears to be very
effective in reducing the chance
of this type of accident.
Therefore:
• Wear a brightly colored jacket.
• Use extra caution when appro- aching and passing through
intersections, since intersec-
tions are the most likely places
for motorcycle accidents to
occur.
• Ride where other motorists can see you. Avoid riding in anot-
her motorist’s blind spot.
Many accidents involve inexpe-
rienced operators. In fact, many
operators who have been invol-
ved in accidents do not even
have a current motorcycle licen-
se.
• Make sure that you are quali- fied and that you only lend your
motorcycle to other qualified
operators.
• Know your skills and limits. Staying within your limits may
help you to avoid an accident.
• We recommend that you prac- tice riding your motorcycle
where there is no traffic until
you have become thoroughly
familiar with the motorcycle
and all of its controls.
Many accidents have been cau-
sed by error of the motorcycle
operator. A typical error made by
the operator is veering wide on a
turn due to EXCESSIVE SPEED
or undercornering (insufficient
lean angle for the speed).
1
tSAFETY INFORMATION
1-1
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