Yamaha YZF R125 Service Repair Manual
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5D7-F8197-E0
EAS20060
YZF-R125
SERVICE MANUAL
© by MBK Industrie
First edition, January 2008
All rights reserved.
Any reproduction or unauthorized use
without the written permission of
MBK Industrie
is expressly prohibited.
YamahaR125.COM
EAS20070
NOTICE
This manual was produced by MBK Industrie. primarily for use by Yamaha dealers and their qualified
mechanics. It is not possible to include all the knowledge of a mechanic in one manual. Therefore, any-
one who uses this book to perform maintenance and repairs on Yamaha vehicles should have a basic
understanding of mechanics and the techniques to repair these types of vehicles. Repair and mainte-
nance work attempted by anyone without this knowledge is likely to render the vehicle unsafe and unfit
for use.
Yamaha Motor Company, Ltd. is continually striving to improve all of its models. Modifications and sig-
nificant changes in specifications or procedures will be forwarded to all authorized Yamaha dealers and
will appear in future editions of this manual where applicable.
NOTE:
Designs and specifications are subject to change without notice.
EAS20080
IMPORTANT MANUAL INFORMATION
Particularly important information is distinguished in this manual by the following.
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 vehicle operator, a bystander or a person checking or repairing the ve-
hicle.
A CAUTION indicates special precautions that must be taken to avoid dam-
age to the vehicle.
A NOTE provides key information to make procedures easier or clearer.
WARNING
CAUTION:
NOTE:
YamahaR125.COM
EAS20090
HOW TO USE THIS MANUAL
This manual is intended as a handy, easy-to-read reference book for the mechanic. Comprehensive
explanations of all installation, removal, disassembly, assembly, repair and check procedures are laid
out with the individual steps in sequential order.
• The manual is divided into chapters and each chapter is divided into sections. The current section title
“1” is shown at the top of each page.
• Sub-section titles “2” appear in smaller print than the section title.
• To help identify parts and clarify procedure steps, there are exploded diagrams “3” at the start of each
removal and disassembly section.
• Numbers “4” are given in the order of the jobs in the exploded diagram. A number indicates a disas-
sembly step.
• Symbols “5” indicate parts to be lubricated or replaced.
Refer to “SYMBOLS”.
• A job instruction chart “6” accompanies the exploded diagram, providing the order of jobs, names of
parts, notes in jobs, etc.
• Jobs “7” requiring more information (such as special tools and technical data) are described sequen-
tially.
1
7
3
4
5
6
2
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SYMBOLS
The following symbols are used in this manual
for easier understanding.
NOTE:
The following symbols are not relevant to every
vehicle.
G
M
E
B LS
M
9 10
11 12
13 14
15 16
17 18
LT
New
BF
S
T
R
.
.
1 2 3
4 5 6
7 8
1. Serviceable with engine mounted
2. Filling fluid
3. Lubricant
4. Special tool
5. Tightening torque
6. Wear limit, clearance
7. Engine speed
8. Electrical data
9. Engine oil
10. Gear oil
11. Molybdenum disulfide oil
12. Brake fluid
13. Wheel bearing grease
14.Lithium-soap-based grease
15.Molybdenum disulfide grease
16. Silicone grease
17.Apply locking agent (LOCTITE®).
18. Replace the part with a new one.
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YamahaR125.COM
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TABLE OF CONTENTS
GENERAL INFORMATION
1
SPECIFICATIONS
2
PERIODIC CHECKS AND
ADJUSTMENTS
3
CHASSIS
4
ENGINE
5
COOLING SYSTEM
6
FUEL SYSTEM
7
ELECTRICAL SYSTEM
8
TROUBLESHOOTING
9
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YamahaR125.COM
1
GENERAL INFORMATION
IDENTIFICATION ............................................................................................ 1-1
VEHICLE IDENTIFICATION NUMBER ..................................................... 1-1
MODEL LABEL.......................................................................................... 1-1
FEATURES ...................................................................................................... 1-2
OUTLINE OF THE FI SYSTEM ................................................................. 1-2
FI SYSTEM................................................................................................ 1-3
MULTI-FUNCTION DISPLAY .................................................................... 1-4
IMPORTANT INFORMATION ......................................................................... 1-5
PREPARATION FOR REMOVAL AND DISASSEMBLY........................... 1-5
REPLACEMENT PARTS........................................................................... 1-5
GASKETS, OIL SEALS AND O-RINGS .................................................... 1-5
LOCK WASHERS/PLATES AND COTTER PINS ..................................... 1-5
BEARINGS AND OIL SEALS .................................................................... 1-6
CIRCLIPS .................................................................................................. 1-6
CHECKING THE CONNECTIONS .................................................................. 1-7
SPECIAL TOOLS ............................................................................................ 1-8
YamahaR125.COM
IDENTIFICATION
1-1
EAS20130
IDENTIFICATION
EAS20140
VEHICLE IDENTIFICATION NUMBER
The vehicle identification number “1” is stamped
into the right side of the steering head pipe.
EAS20150
MODEL LABEL
The model label “1” is affixed to the frame. This
information will be needed to order spare parts.
1
1
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This manual for YAMAHA YZF R125 SERVICE REPAIR is a valuable resource for individuals interested in the technical aspects of this brand. It provides immediate access to comprehensive technical details directly from the manufacturer. Whether you are a professional mechanic or a DIY enthusiast, this manual offers complete information on the brand.
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This manual provides step-by-step instructions, along with access to pictures, diagrams, assembly, disassembly, cleaning, repairing, and maintenance of YAMAHA YZF R125 SERVICE REPAIR.
The manual contains maintenance and repair details, including mechanical and technical specifications of the vehicle, introductory mechanics, equipment elevation, collisions, products and supplies, painting, and descriptions of various parts of the vehicle.
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