Yamaha YZ450FX 2021 Guide d'application

Read this manual carefully before operating this vehicle.

2021

OWNER’S SERVICE MANUAL

YZ450FX

YZ450FXM

LIT-11626-34-52 BEX-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.

FCC CAUTION

Changes or modifications not expressly approved by the party responsible for compliance could void the user’s

authority to operate the equipment.

This transmitter must not be co-located or operated in conjunction with any other antenna or transmitter.

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment and meets

the FCC radio frequency (RF) Exposure Guidelines. This equipment has very low levels of RF energy that is

deemed to comply without maximum permissive exposure evaluation (MPE).

EAM20080

YZ450FXM

OWNER’S SERVICE MANUAL

First edition, July 2020

Any reproduction or unauthorized use

without the written permission of

Yamaha Motor Corporation, U.S.A.

is expressly prohibited.

P/N. LIT-11626-34-52

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

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