Yamaha YZ 2018 Series Guida all'applicazione

B29-28199-13LIT-11626-31-25

Read this manual carefully before operating this vehicle.

YZ250FXJ

OWNER’S SERVICE MANUAL

YZ250FX

2018

PRINTED IN JAPAN

2017.04-0.3×1 !

(E)

PRINTED ON RECYCLED PAPER

2018

YZ250FXJ

B29-28199-13_cover.indd 1-3 2017/04/11 9:54:00

QRead this manual carefully before operating this vehicle. This manual should stay with this vehicle if it is sold.

For your best ownership experience, think Genuine Yamaha!

Genuine Yamaha Parts – Genuine Yamaha replacement parts are the exact same parts as the ones

originally equipped on your vehicle, providing you with the performance and durability you have come to

expect. Why settle for aftermarket parts that may not provide full confidence and satisfaction?

Genuine Yamaha Accessories – Yamaha only offers accessories that meet our high standards for quality

and performance. Buy with confidence, knowing your Genuine Yamaha Accessories will fit right and

perform right – right out of the box.

Yamalube – Take care of your Yamaha with legendary Yamalube oils, lubricants, and care products.

They're formulated and approved by the toughest judges we know: the Yamaha engineering teams that

know your Yamaha from the inside out.

Genuine Yamaha Service Manuals – Get the same factory manual for your vehicle that the technicians

at your authorized Yamaha dealer use. Service manuals are available through your Yamaha dealer or you

can order them directly through yamahapubs.com.

Genuine Yamaha products are available only from your Yamaha dealer.

Find out more at yamaha-motor.com

postscript3-本文レイアウト準拠-.fm Page 1 Monday, May 23, 2011 1:39 PM

B29-28199-13_cover.indd 4-6 2017/04/11 9:54:00

EASB29B002

YZ250FXJ

OWNER’S SERVICE MANUAL

1st Edition, April 2017

Any reprinting or unauthorized use

without the written permission of

Yamaha Motor Corporation, U.S.A.

is expressly prohibited.

Printed in Japan.

P/N. LIT-11626-31-25

EASB29B003

INTRODUCTION

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 man-

ual contains the most current product information available at the time of printing, there may be mi-

nor discrepancies between your machine and this manual. If you have any questions concerning

this manual, 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, disas-

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

mechanical damage.

EWA

WARNING

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.

EASB29B004

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

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

EASB29B005

SAFETY INFORMATION

THIS MACHINE IS DESIGNED STRICTLY FOR COMPETITION USE, ONLY ON A CLOSED

COURSE. It is illegal for this machine to be operated on any public street, road, or highway. Off-road

use on public lands may also be illegal. Please check local regulations before riding.

• THIS MACHINE IS TO BE OPERATED BY AN EXPERIENCED RIDER ONLY.

Do not attempt to operate this machine at maximum power until you are totally familiar with its char-

acteristics.

• THIS MACHINE IS DESIGNED TO BE RIDDEN BY THE OPERATOR ONLY.

Do not carry passengers on this machine.

• ALWAYS WEAR PROTECTIVE APPAREL.

When operating this machine, always wear an approved helmet with goggles or a face shield. Also

wear heavy boots, gloves, and protective clothing. Always wear proper fitting clothing that will not

be caught in any of the moving parts or controls of the machine.

• ALWAYS MAINTAIN YOUR MACHINE IN PROPER WORKING ORDER.

For safety and reliability, the machine must be properly maintained. Always perform the pre-oper-

ation checks indicated in this manual.

Correcting a mechanical problem before you ride may prevent an accident.

• GASOLINE IS HIGHLY FLAMMABLE.

Always turn off the engine while refueling. Take care to not spill any gasoline on the engine or ex-

haust system. Never refuel in the vicinity of an open flame, or while smoking.

• GASOLINE CAN CAUSE INJURY.

If you should swallow some gasoline, inhale excess gasoline vapors, or allow any gasoline to get

into your eyes, contact a doctor immediately. If any gasoline spills onto your skin or clothing, imme-

diately wash skin areas with soap and water, and change your clothes.

• ONLY OPERATE THE MACHINE IN AN AREA WITH ADEQUATE VENTILATION.

Never start the engine or let it run for any length of time in an enclosed area. Exhaust fumes are

poisonous. These fumes contain carbon monoxide, which by itself is odorless and colorless. Car-

bon monoxide is a dangerous gas which can cause unconsciousness or can be lethal.

• PARK THE MACHINE CAREFULLY; TURN OFF THE ENGINE.

Always turn off the engine if you are going to leave the machine. Do not park the machine on a slope

or soft ground as it may fall over.

• THE ENGINE, EXHAUST PIPE AND MUFFLER WILL BE VERY HOT AFTER THE ENGINE HAS

BEEN RUN.

Be careful not to touch them or to allow any clothing item to contact them during inspection or repair.

• PROPERLY SECURE THE MACHINE BEFORE TRANSPORTING IT.

For safety, drain the gasoline from the fuel tank before transporting the vehicle.

EASB916006 YAMAHA MOTOR CORPORATION, U.S.A.

YZ MOTORCYCLE LIMITED WARRANTY

EASB29B006

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 re-

moval 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.

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

quentially.

CLUTCH

5-40

EASB29B238

CLUTCH

Removing the clutch

skrameRyt’QemantraPredrO

Engine oil

Drain.

Refer to “CHANGING THE ENGINE OIL” on

page 3-15.

.1-5egapno”LAVOMERENIGNE“otrefeRladepekarB

.tcennocsiD1elbachctulC

1revochctulC2

1teksaG3

5gnirpshctulC4

1etalperusserP5

11dorhsuP6

1pilcriC7

1rehsaW8

1gniraeB9

1llaB01

dorhsuP11

41etalpnoitcirF21

8etalphctulC31

New

(5)

(6)

789610

19 20

13 LT

10 N・m (1.0 kgf・m, 7.4 lb・ft)

75 N・m (7.5 kgf・m, 55 lb・ft)

CLUTCH

5-43

EASB29B239

REMOVING THE CLUTCH

1. Remove:

• Clutch boss nut “1”

• Lock washer “2”

• Clutch boss “3”

TIP

• Straighten the lock washer tab.

• While holding the clutch boss with the clutch

holder “4”, loosen the clutch boss nut.

EASB29B240

CHECKING THE FRICTION PLATES

1. Check:

• Friction plate

Damage/wear Replace the friction plates

as a set.

2. Measure:

• Friction plate thickness

Out of specification Replace the friction

plates as a set.

TIP

Measure it at four points on the friction plate.

EASB29B241

CHECKING THE CLUTCH PLATES

1. Check:

• Clutch plate

Damage Replace the clutch plates as a

set.

2. Measure:

• Clutch plate warpage

(with a surface plate and thickness gauge

“1”)

Out of specification Replace the clutch

plates as a set.

EASB29B242

CHECKING THE CLUTCH SPRINGS

1. Check:

• Clutch spring

Damage Replace the clutch springs as a

set.

2. Measure:

• Clutch spring free length

Out of specification Replace the clutch

springs as a set.

Universal clutch holder

90890-04086

Universal clutch holder

YM-91042

Friction plate thickness

2.90–3.10 mm (0.114–0.122 in)

Wear limit

2.85 mm (0.112 in)

Warpage limit

0.10 mm (0.004 in)

Clutch spring free length

47.80 mm (1.88 in)

Limit

45.41 mm (1.79 in)

EASB29B007

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 Locking agent (LOCTITE®)

Engine oil Replace the part with a new one.

New

TABLE OF CONTENS

GENERAL INFORMATION

SPECIFICATIONS

PERIODIC CHECKS AND

ADJUSTMENTS

CHASSIS

ENGINE

COOLING SYSTEM

FUEL SYSTEM

ELECTRICAL SYSTEM

TROUBLESHOOTING

TUNING

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