Yamaha YZ125 2021 Guida all'applicazione

Read this manual carefully before operating this vehicle.

2021

OWNER’S SERVICE MANUAL

YZ125

YZ125M2

LIT-11626-34-27 B0V-2819U-10

EAM20161Read this manual carefully

Operating, servicing and

maintaining a passenger vehicle or off-road vehicle can

expose you to chemicals including engine exhaust,

carbon monoxide, phthalates, and lead, which are

known to the State of California to cause cancer and

birth defects or other reproductive harm. To minimize

exposure, avoid breathing exhaust, do not idle the

engine except as necessary, service your vehicle in a

well-ventilated area and wear gloves or wash your

hands frequently when servicing your vehicle. For more

information go to

www.P65Warnings.ca.gov/passenger-vehicle

Read this manual carefully before operating this vehicle. This manual should stay with this vehicle

if it is sold.

EAM20080

YZ125M2

OWNER’S SERVICE MANUAL

First edition, April 2020

Any reproduction or unauthorized use

without the written permission of

Yamaha Motor Corporation, U.S.A.

is expressly prohibited.

P/N. LIT-11626-34-27

EAM20180

IMPORTANT

Congratulations on your purchase of a Yamaha YZ series. This model is the culmination of Yamaha’s

vast experience in the production of pacesetting racing machines. It represents the highest grade of

craftsmanship and reliability that have made Yamaha a leader.

This manual explains operation, inspection, basic maintenance and tuning of your machine. If you have

any questions about this manual or your machine, please contact your Yamaha dealer.

TIP

•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 dis-

crepancies between your machine and this manual. If you have any questions concerning this man-

ual, please consult your Yamaha dealer.

•This manual is intended for those who have basic knowledge and skill concerning the servicing of

Yamaha motorcycles (e.g., Yamaha dealers, service engineers, etc.). Those who have little knowl-

edge and skill concerning servicing are requested not to undertake inspection, adjustment, disassem-

bly, or reassembly only by reference to this manual. It may lead to servicing trouble and mechanical

damage.

WARNING

EWA20270

PLEASE READ THIS MANUAL CAREFULLY AND COMPLETELY BEFORE OPERATING THIS

MACHINE. DO NOT ATTEMPT TO OPERATE THIS MACHINE UNTIL YOU HAVE ATTAINED A

SATISFACTORY KNOWLEDGE OF ITS CONTROLS AND OPERATING FEATURES AND UNTIL

YOU HAVE BEEN TRAINED IN SAFE AND PROPER RIDING TECHNIQUES. REGULAR INSPEC-

TIONS AND CAREFUL MAINTENANCE, ALONG WITH GOOD RIDING SKILLS, WILL ENSURE

THAT YOU SAFETY ENJOY THE CAPABILITIES AND THE RELIABILITY OF THIS MACHINE.

EAM30001

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 per-

sonal injury 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

EAM20162

YAMAHA MOTOR CORPORATION, U.S.A. YZ MOTORCYCLE LIMITED

WARRANTY

EAM20082

HOW TO USE THIS MANUAL

In this manual, descriptions of installation, removal, disassembly, assembly, check, and adjustment

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 removal

or a disassembly 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, the names

of parts, the notes in jobs, etc. This step explains removal and disassembly procedure only. For in-

stallation and assembly procedure, reverse the steps.

•Jobs “7” requiring more information (such as special tools and technical data) are described sequen-

tially.

G088877

EAM20083

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.

New

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

TUNING

EAM10003

TABLE OF CONTENTS

Indice

Altri manuali Yamaha Motociclo

Yamaha

Yamaha XV1700P 2002 Manuale utente

Yamaha

Yamaha PW50(W) Manuale utente

Yamaha

Yamaha WR250R Manuale utente

Yamaha

Yamaha TT-R110E Manuale utente

Yamaha

Yamaha FJR1300A Manuale utente

Yamaha

Yamaha TDM TWIN 900 Manuale utente

Yamaha

Yamaha TT250RM 1999 Manuale utente

Yamaha

Yamaha XJR1300 2007 Manuale utente

Yamaha

Yamaha TW200N Manuale utente

Yamaha

Yamaha Libero Manuale di istruzioni

Yamaha

Yamaha TRACER 700 2020 Manuale utente

Yamaha

Yamaha XVS650 '97 Manuale

Yamaha

Yamaha XT500E Manuale utente

Yamaha

Yamaha WR250FM 2021 Guida all'applicazione

Yamaha

Yamaha YZ250F(N)/LC Guida all'applicazione

Yamaha

Yamaha midnight star XVS1300A Manuale utente

Yamaha

Yamaha 2011 YZ250FA Guida all'applicazione

Yamaha

Yamaha XTZ07AR 2024 Manuale utente

Yamaha

Yamaha XV250E Manuale utente

Yamaha

Yamaha YP250D 98 Manuale

Yamaha

Yamaha TT-R230X 2007 Manuale utente

Yamaha

Yamaha YFM400FWA 2000 5GH3-AE1 Manuale utente

Yamaha

Yamaha YZFR1LEC Manuale utente

Yamaha

Yamaha YZ85(D) Manuale utente

Manuali Motociclo popolari di altre marche

OHVALE

OHVALE GP-0 Manuale elenco delle parti

KTM

KTM 350 XCF-W USA Manuale utente

HYOSUNG

HYOSUNG ST7 Manuale utente

Husqvarna

Husqvarna FC 250 2016 Manuale utente

Ducati

Ducati SCRAMBLER 800 Manuale di istruzioni

MOTO GUZZI

MOTO GUZZI QUOTA 1100 ES Manuale utente

APRILIA

APRILIA ETV MILLE CAPONORD - PART1 02-2001 Manuale utente

KTM

KTM Freeride E-XC 2021 Manuale utente

Fantic

Fantic Enduro 125 Manuale utente

Ducati

Ducati Supersport 750 desmodue Manuale utente

MV Agusta

MV Agusta 2008 F4 312RR 1078 Manuale di istruzioni

Ducati

Ducati 748 monoposto strada Manuale utente

ATK

ATK 1988 250 Manuale utente

Excelsior-HENDERSON

Excelsior-HENDERSON 1999 HCX Manuale utente

Triumph

Triumph Thunderbird Manuale utente

Ducati

Ducati 996 Manuale utente

BMW

BMW MOTORRAD K 1200 R Sport Manuale di installazione e manutenzione

BMW Motorrad

BMW Motorrad G 650 GS 2007 Manuale di installazione e manutenzione