Yamaha XSR125 2021 User manual

2021
SERVICE MANUAL
XSR125
MTM125
BFG-F8197-E0

EAS20003
IMPORTANT
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. Please refer to “BA-
SIC INFORMATION” (separate volume, Y0A-28197-E0*) for basic instructions that must be observed
during servicing. Repair and maintenance work attempted by anyone without this knowledge is likely to
render the vehicle unsafe and unfit for use.
Yamaha Motor Company, Ltd. and MBK Industrie are continually striving to improve all of its models.
Modifications and significant changes in specifications or procedures will be forwarded to all authorized
Yamaha dealers and will appear in future editions of this manual where applicable.
TIP
•*Ifthecontentsofthemanualarerevised,thelastdigit of the manual number will be increased by one.
•ThisServiceManualcontainsinformationregardingperiodicmaintenancetotheemissioncontrolsys-
tem. Please read this material carefully.
•Designsandspecificationsaresubjecttochangewithoutnotice.
EAS30001
IMPORTANT MANUAL INFORMATION
Particularly important information is distinguished in this manual by the following notations.
This is the safety alert symbol. It is used to alert you to potential personal inju-
ry hazards. Obey all safety messages that follow this symbol to avoid possible
injury or death.
A WARNING indicates a hazardous situation which, if not avoided, could result
in death or serious injury.
A NOTICE indicates special precautions that must be taken to avoid damage to
the vehicle or other property.
A TIP provides key information to make procedures easier or clearer.
WARNING
NOTICE
TIP
EAS20002
MTM125
SERVICE MANUAL
©2021 by MBK Industrie
First edition, May 2021
All rights reserved.
Any reproduction or unauthorized use
without the written permission of
MBK Industrie
is expressly prohibited.

EAS20004
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.
•Themanualisdividedintochaptersandeachchapterisdivided into sections. The current section title
“1” is shown at the top of each page.
•Sub-sectiontitles“2”appearinsmallerprintthanthesectiontitle.
•Tohelpidentifypartsandclarifyproceduresteps,there are exploded diagrams “3” at the start of each
removal and disassembly section.
•Numbers“4”aregivenintheorderofthejobsintheexplodeddiagram.Anumberindicatesadisas-
sembly step.
•Symbols“5”indicatepartstobelubricatedorreplaced.
Refer to “SYMBOLS”.
•Ajobinstructionchart“6”accompaniestheexploded diagram, providing the order of jobs, names of
parts, notes in jobs, etc. This step explains removal and disassembly procedure only. For installation
and assembly procedure, reverse the steps.
•Jobs“7”requiringmoreinformation(suchasspecialtoolsandtechnicaldata)aredescribedsequen-
tially.
1
7
3
5
4
6
2
G088877

EAS20005
SYMBOLS
The following symbols are used in this manual for easier understanding.
TIP
The following symbols are not relevant to every vehicle.
SYMBOL DEFINITION SYMBOL DEFINITION
Serviceable with engine mounted Gear oil
Filling fluid Molybdenum disulfide oil
Lubricant Brake fluid
Special tool Wheel bearing grease
Tightening torque Lithium-soap-based grease
Wear limit, clearance Molybdenum disulfide grease
Engine speed Silicone grease
Electrical data Apply locking agent (LOCTITE®).
Engine oil Replace the part with a new one.
G
M
BF
B
T
R
.
.
LS
M
S
LT
E
New

EAS10003 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
SELF DIAGNOSTIC 9

1
GENERAL INFORMATION
IDENTIFICATION ............................................................................................1-1
VEHICLE IDENTIFICATION NUMBER .....................................................1-1
ENGINE SERIAL NUMBER ......................................................................1-1
MODEL LABEL..........................................................................................1-1
FEATURES...................................................................................................... 1-2
MULTI-FUNCTION METER UNIT .............................................................1-2
SPECIAL TOOLS ............................................................................................1-6

IDENTIFICATION
1-1
EAS20007
IDENTIFICATION
EAS30002
VEHICLE IDENTIFICATION NUMBER
The vehicle identification number “1” is stamped
into the steering head pipe.
EAS30004
ENGINE SERIAL NUMBER
The engine serial number “1” is stamped into the
crankcase.
EAS30003
MODEL LABEL
The model label “1” is affixed to the frame under
the seat. This information will be needed to order
spare parts.
1
1
1