Yamaha YZ125 2019 Guida all'applicazione
B0V-28199-10LIT-11626-32-19
Read this manual carefully before operating this vehicle.
YZ125K2
OWNER’S SERVICE MANUAL
YZ125
2019
PRINTED IN JAPAN
2018.04-0.4×1 !
(E)
PRINTED ON RECYCLED PAPER
2019
YZ125K2
B0V-28199-10_OSM_cover.indd 1-3 2018/03/09 14:26:49
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
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
QRead this manual carefully before operating this vehicle. This manual should stay with this vehicle if it is sold.
B0V-28199-10_OSM_cover.indd 4-6 2018/03/09 14:26:49
YZ125K2
OWNER'S SERVICE MANUAL
©2019 by Yamaha Motor Corporation, U.S.A.
1st Edition, April 2018
All rights reserved.
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-11626-32-19
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, ba-
sic maintenance and tuning of your machine. If
you have any questions about this manual or
your machine, please contact your Yamaha
dealer.
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 discrepancies between
your machine and this manual. If you have any
questions concerning this manual, please con-
sult your Yamaha dealer.
PLEASE READ THIS MANUAL CAREFULLY
AND COMPLETELY BEFORE OPERATING
THIS MACHINE. DO NOT ATTEMPT TO OP-
ERATE THIS MACHINE UNTIL YOU HAVE
ATTAINED A SATISFACTORY KNOWL-
EDGE OF ITS CONTROLS AND OPERATING
FEATURES AND UNTIL YOU HAVE BEEN
TRAINED IN SAFE AND PROPER RIDING
TECHNIQUES. REGULAR INSPECTIONS
AND CAREFUL MAINTENANCE, ALONG
WITH GOOD RIDING SKILLS, WILL ENSURE
THAT YOU SAFETY ENJOY THE CAPABILI-
TIES AND THE RELIABILITY OF THIS MA-
CHINE.
IMPORTANT MANUAL
INFORMATION
Particularly important information is distin-
guished in this manual by the following nota-
tions.
This is the safety alert symbol. It is used to
alert you to potential personal injury haz-
ards. Obey all safety messages that follow
this symbol to avoid possible injury or
death.
A WARNING indicates a hazardous situa-
tion 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 proce-
dures easier or clearer.
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 be-
fore 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 characteristics.
• THIS MACHINE IS DESIGNED TO BE RID-
DEN 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-
operation 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 en-
gine or exhaust system. Never refuel in the vi-
cinity 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 imme-
diately. If any gasoline spills onto your skin or
clothing, immediately 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. Carbon monoxide is a danger-
ous 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, MUFFLER,
AND OIL TANK 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 inspec-
tion or repair.
• PROPERLY SECURE THE MACHINE BE-
FORE TRANSPORTING IT.
When transporting the machine in another ve-
hicle, always be sure it is properly secured
and in an upright position and that the fuel
cock is in the "OFF" position. Otherwise, fuel
may leak out of the carburetor or fuel tank.
YAMAHA MOTOR CORPORATION, U.S.A.
YZ MOTORCYCLE LIMITED WARRANTY
HOW TO USE THIS MANUAL
FINDING THE REQUIRED PAGE
1. This manual consists of seven chapters; "General Information", "Specifications", "Regular inspec-
tion and adjustments", "Engine", "Chassis", "Electrical" and "Tuning"
2. The table of contents is at the beginning of the manual. Look over the general layout of the book
before finding then required chapter and item.
Bend the book at its edge, as shown, to find the required fore edge symbol mark and go to a page
for required item and description.
MANUAL FORMAT
All of the procedures in this manual are organized in a sequential, step-by-step format. The informa-
tion has been complied to provide the mechanic with an easy to read, handy reference that contains
comprehensive explanations of all disassembly, repair, assembly, and inspection operations.
In this revised format, the condition of a faulty component will precede an arrow symbol and the
course of action required will follow the symbol, e.g.,
• Bearings
Pitting/damage →Replace.
HOW TO READ DESCRIPTIONS
To help identify parts and clarify procedure steps, there are exploded diagrams at the start of each
removal and disassembly section.
1. An easy-to-see exploded diagram "1" is provided for removal and disassembly jobs.
2. Numbers "2" are given in the order of the jobs in the exploded diagram. A number that is enclosed
by a circle indicates a disassembly step.
3. An explanation of jobs and notes is presented in an easy-to-read way by the use of symbol marks
"3". The meanings of the symbol marks are given on the next page.
4. A job instruction chart "4" accompanies the exploded diagram, providing the order of jobs, names
of parts, notes in jobs, etc.
5. For jobs requiring more information, the step-by-step format supplements "5" are given in addition
to the exploded diagram and job instruction chart.
ILLUSTRATED SYMBOLS (Refer
to the illustration)
Illustrated symbols "1" to "7" are used to identi-
fy the specifications appearing in the text.
1. With engine mounted
2. Filling fluid
3. Lubricant
4. Special tool
5. Tightening
6. Specified value, Service limit
7. Resistance (Ω), Voltage (V), Electric cur-
rent (A)
Illustrated symbols "8" to "14" in the exploded
diagrams indicate grade of lubricant and loca-
tion of lubrication point.
8. Apply engine mixing oil
9. Apply transmission oil
10. Apply molybdenum disulfide oil
11. Apply brake fluid
12. Apply lightweight lithium-soap base grease
13. Apply molybdenum disulfide grease
14. Apply silicone grease
Illustrated symbols "15" to "16" in the exploded
diagrams indicate where to apply a locking
agent and where to install new parts.
15. Apply locking agent (LOCTITE®)
16. Use new one
MEMO
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