Yamaha WR450FB 2012 Application guide

2012-2015
OWNER’S SERVICE MANUAL
WR450FB
1DX-28199-10LIT-11626-25-58
WR450FB 2012
qRead this manual carefully before operating this vehicle.
PRINTED ON RECYCLED PAPER PRINTED IN JAPAN
2012.01––1.4 ×1 !
(E)
1DX-28199-10_Hyoshi.indd 1 2012/01/19 16:15:01

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
QRead this manual carefully before operating this vehicle.This manual should stay with this vehicle if it is sold.
1DX-28199-10_Hyoshi.indd 2 2012/01/19 16:15:01

EAS1DX3002
WR450FB
OWNER’S SERVICE MANUAL
©2012 by Yamaha Motor Corporation, U.S.A.
1st Edition, January 2012
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-11626-25-58

EAS1DX3003
INTRODUCTION
Congratulations on your purchase of a Yamaha WR series. This model is the culmination of Yama-
ha'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.
The design and manufacture of this Yamaha machine fully comply with the emissions standards for
clean air applicable at the date of manufacture. Yamaha has met these standards without reducing
the performance or economy of operation of the machine. To maintain these high standards, it is im-
portant that you and your Yamaha dealer pay close attention to the recommended maintenance
schedules and operating instructions contained within this manual.
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
discrepancies between your machine and this manual. If you have any questions concerning this
manual, please consult your Yamaha dealer.
EWA1DX0001
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.
EAS1DX3004
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

EAS1DX3005
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 preopera-
tion 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, MUFFLER, AND OIL TANK WILL BE VERY HOT AFTER THE EN-
GINE 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.

EAS1DX3006
YAMAHA MOTOR CORPORATION, U.S.A.
WR MOTORCYCLE LIMITED WARRANTY
Yamaha Motor Corporation, U.S.A. hereby warrants
to the original retail purchaser that the following
components equipped on new Yamaha WR
motorcycles purchased from an authorized Yamaha
motorcycle dealer in the continental United States will
be free from defects
in materiel and workmanship for
the period of time stated herein, subject to certain
stated limitations. WR components included under
this warranty are the engine, frame, swingarm , and
monoshock. It is understood that the balance of the
WR components are not covered by any warranty,
expressed
or implied. The balance of the
components equipped on the unit are sold on an
11
85
is" basis. This warranty applies to the original
purchaser only and is not transferable.
THE PERIOD OF WARRANTY for the above-listed
Yamaha WR components as originally installed on
the unit shall be thirty (30) days from the date of
purchase.
MODELS EXCLUDED FROM WARRANTY include
those used for non-Yamaha-authorized renting,
leasing, or other commercial purposes.
DURING THE PERIOD
OF WARRANTY any
authorized Yamaha motorcycle dealer will, free of
charge, repair
or replace, at Yamaha's option, any
part adjudged defective by Yamaha due to faulty
workmanship or material from the factory. Parts used
in warranty repairs will be warranted for the balance
of the product's warranty period. All parts replaced
under warranty become property of Yamaha Motor
Corporation, U.S.A.
GENERAL EXCLUSIONS from this warranty shall
include any failures caused by:
a. Installation of parts or accessories that are not
qualitatively equivalent to genuine Yamaha
parts.
b. Abnormal strain, neglect, or abuse.
c. Accident or collision damage.
d. Modification to original parts.
e. Lack of proper maintenance.
I . Damage due to improper transportation.
SPECIFIC EXCLUSIONS from this warranty shall
include parts replaced due to normal wear or routine
maintenance.
THE CUSTOMER'S RESPONSIBILITY under this
warranty shall be
to:
1. Operate and maintain the WR as specified in the
appropriate Service Manual, and
2. Give notice to an authorized Yamaha motorcycle
dealer of any and all apparent defects within ten
(10) days after discovery, and make the machine
available at that time for inspection and repairs
at such place of business.
EMISSION CONTROL SYSTEM WARRANTY
Yamaha Motor Corporation, U.S.A. also warrants to
the ultimate purchaser and each subsequent
purchaser of each 2006 and later model Yamaha
motorcycle covered by this warranty that the vehicle
is designed, built, and equipped so as to conform at
the time of sale with all U.S. emissions standards
applicable at the time of manufacture and that it is
free from defects in materials and workmanship
which would cause it not to meet these standards
within the period listed immediately below. Failures
other than those resulting from defects
in material or
workmanship which arise solely as a result of owner
abuse and/or lack of proper maintenance are not
covered by this warranty.
WARRANTY QUESTIONS AND ANSWERS
All Off-Road Models
Thirty (30) months from the original purchase date
YAMAHA MOTOR CORPORATION, U.S.A. MAKES
NO OTHER WARRANTY
OF ANY KIND,
EXPRESSED OR IMPLIED.
ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND
RTNESS FOR A PARTICULAR PURPOSE WHICH
EXCEED THE OBLIGATIONS AND TIME LIMITS
STATED IN THIS WARRANTY ARE HEREBY
DISCLAIMED
BY YAMAHA MOTOR CORPORATION,
U.S.A. AND EXCLUDED FROM
THIS WARRANTY.
SOME STATES
DO NOT ALLOW LIMITATIONS ON
HOW LONG
AN IMPLIED WARRANTY LASTS, SO
THE ABOVE LIMITATION MAY NOTAPPLY TO YOU .
ALSO EXCLUDED FROM
THIS WARRANTY ARE
ANY
INCIDENTAL OR CONSEQUENTIAL DAMAGES
INCLUDING LOSS OF USE. SOME STATES DO NOT
ALLOW THE EXCLUSION OR LIMITATION OF
INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO
THE ABOVE EXCLUSION
MAY NOT APPLY TO
YOU.
THIS WARRANTY GIVES YOU SPECIRC LEGAL
RIGHTS, AND
YOU MAY ALSO HAVE OTHER
RIGHTS WHICH VARY FROM STATE TO STATE.
YAMAHA MOTOR CORPORATION, U.S.A.
CUSTOMER SERVICE
Post Office Box 6555
Cypress, California 90630
0. What costs are my responsibility during the warranty period?
A. The
customer's responsibility includes all costs of normal maintenance services, non- war -
ranty repairs, accident and collision damage, and oil,
oil filters, air filters, spark plugs, and
brake shoes
or pads.
0. What are some examples of "abnormal " strain, neglect, or abuse?
A. These
terms are general and overlap each other in areas. Specific examples include: Run-
ning the machine without oil; operating the machine with a broken or damaged part
which causes another part to fail, damage or failure due to improper or ,careless transpor-
tation and
or tie down; and so on. If you have any specific questions on operation or
maintenance, please contact your dealer for advice.
If your machine requires warranty service, you must take it to any authorized
Yamaha
motorcycle dealer within the continental United States. Be sure to bring
your warranty registration identification or other valid proof of the original date
of purchase. If a question or problem arises regarding warranty , first contact the
owner of the dealer-ship. Since all warranty matters are handled at the dealer
level,
this person is in the best position to help you . If you are still not satisfied
and require
additional assistance, please write:
a. Does the warranty cover incidental costs such as towing or transportation due to a fail -
ure?
A. No. The warranty is limited to repair of the machine itself.
a. May I perform any or all of the recommended maintenance shown in the Owner's Service
Manual instead of having the dealer do them?
A. Yes,
if you are a qualified mechanic and follow the procedures specified in the Owner 's
Service Manual. We do
recommend , however, that items requiring special tools or equip-
ment be done by a Yamaha motorcycle dealer.
a. Will the warranty be void or canceled if I do not operate or maintain my new WR exact-
ly as specified in the Owner 's Service Manual?
A. No. The
warranty on a new motorcycle cannot be " vo i ded" or "cancelled ." However, if a
particular failure is caused by operation or maintenance other than as shown in the
Owner's Service Manual, that failure may not be covered under warranty.
a. What responsibility does my dealer have under this warranty?
A. Each Yamaha
motorcycle dealer is expected to:
1.
Completely set up every new machine before sale.
2. Explain the operation, maintenance, and warranty requirements to your satisfaction
at the
time of sale, and upon your request at any later date.
In
addition , each Yamaha motorcycle dealer is held responsible for his setup, service
and
warranty repair work.
a. Does the warranty on the engine include the carburetor, air filter, air box, and exhaust
pipe?
A. No. The
warranty covers only the engine components .
YAMAHA MOTOR CORPORATION U.S.A.
CUSTOMER RELATIONS DEPARTMENT
P.O. Box 6555
Cypress, California 90630
When contacting Yamaha Motor Corporation, U.S.A. don't forget to include any
important information such as names, addresses, model, V.I.N. ( frame number ),
dates, and receipts.
CHANGE OF ADDRESS
The federal government requires each manufacturer of a motor vehicle to main-
tain a complete, up-to-date list of all first purchasers against the possibility of a
safety-related defect and recall. This
list is compiled from the purchase registra-
t ions sent
to Yamaha Motor Corporation, U.S.A. by the selling dealer at the time
of your purchase.
If
you should move after you have purchased your new motorcycle , please
advise us
of your new address by sending a postcard listing your motorcycle
model name, V.I.N . ( frame number) , dealer number ( or deale' s name) as it is
shown on your warranty identification, your name and new mailing address.
Mail to:
YAMAHA MOTOR CORPORATION, U.S.A.
WARRANTY DEPARTMENT
P.O. Box 6555
Cypress, California 90630
This will ensure that Yamaha Motor Corporation, U.S.A. has an up-to-date regis-
tration record in accorda nce with federal law .

EAS1DX3007
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.
• 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 dis-
assembly 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, names
of parts, notes in jobs, etc.
• Jobs “7” requiring more information (such as special tools and technical data) are described se-
quentially.
1
7
3
4
6
2
5

EAS1DX3008
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

1
2
3
4
5
6
7
8
9
10
TABLE OF CONTENTS
GENERAL INFORMATION
SPECIFICATIONS
PERIODIC CHECKS AND ADJUST-
MENTS
TUNING
CHASSIS
ENGINE
COOLING SYSTEM
FUEL SYSTEM
ELECTRICAL SYSTEM
TROUBLESHOOTING
toc1.fm 1 ページ ２０１２年１月１８日 水曜日 午前１１時８分

GENERAL INFORMATION
LOCATION OF IMPORTANT LABELS............................................................1-1
DESCRIPTION..................................................................................................1-3
CONSUMER INFORMATION...........................................................................1-4
VEHICLE IDENTIFICATION NUMBER ......................................................1-4
ENGINE SERIAL NUMBER........................................................................1-4
MODEL LABEL...........................................................................................1-4
VEHICLE EMISSION CONTROL INFORMATION LABEL.........................1-4
FEATURES.......................................................................................................1-5
OUTLINE OF THE FI SYSTEM ..................................................................1-5
FI SYSTEM.................................................................................................1-6
INCLUDED PARTS...........................................................................................1-7
VALVE JOINT.............................................................................................1-7
SPARK PLUG WRENCH............................................................................1-7
NIPPLE WRENCH......................................................................................1-7
HANDLEBAR PROTECTOR ......................................................................1-7
HOOK (FUEL TANK) ..................................................................................1-7
FUEL HOSE JOINT COVER ......................................................................1-7
COUPLER FOR CONNECTING OPTIONAL PART...................................1-8
IMPORTANT INFORMATION...........................................................................1-8
PREPARATION FOR REMOVAL AND DISASSEMBLY............................1-8
REPLACEMENT PARTS............................................................................1-8
GASKETS, OIL SEALS AND O-RINGS .....................................................1-9
LOCK WASHERS/PLATES AND COTTER PINS ......................................1-9
BEARINGS AND OIL SEALS .....................................................................1-9
CIRCLIPS ...................................................................................................1-9
BASIC SERVICE INFORMATION..................................................................1-10
QUICK FASTENERS................................................................................1-10
ELECTRICAL SYSTEM............................................................................1-11
SPECIAL TOOLS ...........................................................................................1-15
CONTROL FUNCTIONS.................................................................................1-20
MAIN SWITCH..........................................................................................1-20
INDICATOR LIGHTS AND WARNING LIGHTS .......................................1-20
ENGINE STOP SWITCH ..........................................................................1-20
START SWITCH.......................................................................................1-21
CLUTCH LEVER ......................................................................................1-21
SHIFT PEDAL...........................................................................................1-21
1

KICKSTARTER CRANK ...........................................................................1-21
THROTTLE GRIP .....................................................................................1-21
FRONT BRAKE LEVER ...........................................................................1-21
REAR BRAKE PEDAL..............................................................................1-22
SIDESTAND .............................................................................................1-22
STARTER KNOB/IDLE ADJUSTING SCREW .........................................1-22
MULTI-FUNCTION DISPLAY .........................................................................1-22
DESCRIPTION .........................................................................................1-22
BASIC MODE ...........................................................................................1-23
CHANGEOVER TO BASIC MODE/RACE MODE....................................1-24
RACE MODE ............................................................................................1-25
FUNCTION DIAFRAM ..............................................................................1-29
STARTING AND BREAK-IN...........................................................................1-30
FUEL.........................................................................................................1-30
HANDLING NOTE ....................................................................................1-31
AIR FILTER MAINTENANCE ...................................................................1-31
STARTING A COLD ENGINE ..................................................................1-31
STARTING A WARM ENGINE .................................................................1-31
BREAK-IN PROCEDURES ......................................................................1-32
TORQUE-CHECK POINTS.............................................................................1-33
MOTORCYCLE CARE AND STORAGE ........................................................1-34
CARE........................................................................................................1-34
STORAGE ................................................................................................1-35

LOCATION OF IMPORTANT LABELS
1-1
EAS1DX3009
LOCATION OF IMPORTANT LABELS
Please read the following important labels carefully before operating this vehicle.
USA
7,81,2,3 4,5
910
6

LOCATION OF IMPORTANT LABELS
1-2
CANADA
Essence super sans
plomb seulement.
3FB-2415E-12

DESCRIPTION
1-3
EAS1DX3010
DESCRIPTION
TIP
• The machine you have purchased may differ slightly from those shown in the following.
• Designs and specifications are subject to change without notice.
1. Clutch lever 13. Headlight
2. Engine stop switch 14. Radiator
3. Multi-function display 15. Coolant drain bolt
4. Main switch 16. Rear brake pedal
5. Start switch 17. Valve joint
6. Front brake lever 18. Starter knob/idle adjusting screw
7. Throttle grip 19. Air cleaner
8. Fuel tank cap 20. Catch tank
9. Taillight 21. Drive chain
10. Kickstarter crank 22. Shift pedal
11. Fuel tank 23. Oil dipstick
12. Radiator cap 24. Front fork
18 2019
2122
2324
91012
15 1416
13
12 3 4 5 76 8
11 17

CONSUMER INFORMATION
1-4
EAS1DX3011
CONSUMER INFORMATION
There are two significant reasons for knowing
the serial number of your machine:
1. When ordering parts, you can give the num-
ber to your Yamaha dealer for positive iden-
tification of the model you own.
2. If your machine is stolen, the authorities will
need the number to search for and identify
your machine.
EAS1DX3012
VEHICLE IDENTIFICATION NUMBER
The vehicle identification number “1” is
stamped into the right side of the frame.
EAS1DX3013
ENGINE SERIAL NUMBER
The engine serial number "1" is stamped into
the elevated part of the right-side of the engine.
EAS1DX3014
MODEL LABEL
The model label “1” is affixed to the frame un-
der the seat. This information will be needed to
order spare parts.
EAS1DX3015
VEHICLE EMISSION CONTROL INFORMA-
TION LABEL
The Vehicle Emission Control Information label
"1" is affixed at the location in the illustration.
This label shows specifications related to ex-
haust emissions as required by federal law,
state law and Environment Canada.
A: For Canada
B: For USA and Canada
1
1
1
1 1

FEATURES
1-5
EAS20170
FEATURES
EAS1DX3016
OUTLINE OF THE FI SYSTEM
The main function of a fuel supply system is to provide fuel to the combustion chamber at the opti-
mum air-fuel ratio in accordance with the engine operating conditions and the atmospheric tempera-
ture. In the conventional carburetor system, the air-fuel ratio of the mixture that is supplied to the
combustion chamber is created by the volume of the intake air and the fuel that is metered by the jet
used in the respective carburetor.
Despite the same volume of intake air, the fuel volume requirement varies by the engine operating
conditions, such as acceleration, deceleration, or operating under a heavy load. Carburetors that me-
ter the fuel through the use of jets have been provided with various auxiliary devices, so that an op-
timum air-fuel ratio can be achieved to accommodate the constant changes in the operating
conditions of the engine.
As the requirements for the engine to deliver more performance and cleaner exhaust gases increase,
it becomes necessary to control the air-fuel ratio in a more precise and finely tuned manner. To ac-
commodate this need, this model has adopted an electronically controlled fuel injection (FI) system,
in place of the conventional carburetor system. This system can achieve an optimum air-fuel ratio
required by the engine at all times by using a microprocessor that regulates the fuel injection volume
according to the engine operating conditions detected by various sensors.
The adoption of the FI system has resulted in a highly precise fuel supply, improved engine response,
better fuel economy, and reduced exhaust emissions.
1. Engine trouble warning light
2. Lean angle sensor
3. Fuel pump
4. Intake air pressure sensor
5. Fuel injector
6. Battery
7. Intake air temperature sensor
8. ECU (engine control unit)
9. Throttle position sensor
10.Coolant temperature sensor
11.Crankshaft position sensor
12.Ignition coil
13.Speed sensor

FEATURES
1-6
EAS1DX3017
FI SYSTEM
The fuel pump delivers fuel to the fuel injector via the fuel filter. The pressure regulator maintains the
fuel pressure that is applied to the fuel injector at a certain level. Accordingly, when the energizing
signal from the ECU energizes the fuel injector, the fuel passage opens, causing the fuel to be inject-
ed into the intake manifold only during the time the passage remains open. Therefore, the longer the
length of time the fuel injector is energized (injection duration), the greater the volume of fuel that is
supplied. Conversely, the shorter the length of time the fuel injector is energized (injection duration),
the lesser the volume of fuel that is supplied.
The injection duration and the injection timing are controlled by the ECU. Signals that are input from
the throttle position sensor, coolant temperature sensor, atmospheric pressure sensor, lean angle
sensor, crankshaft position sensor, intake air pressure sensor and intake air temperature sensor en-
able the ECU to determine the injection duration. The injection timing is determined through the sig-
nals from the crankshaft position sensor. As a result, the volume of fuel that is required by the engine
can be supplied at all times in accordance with the driving conditions.
1. Fuel pump
2. Fuel injector
3. ECU (engine control unit)
4. Throttle position sensor
5. Coolant temperature sensor
6. Crankshaft position sensor
7. Intake air pressure sensor
8. Throttle body
9. Intake air temperature sensor
10.Air filter case
A. Fuel system
B. Intake system
C. Control system
1
10
B
9
87
6
A
2
3
C
4
5

INCLUDED PARTS
1-7
EAS1DX3018
INCLUDED PARTS
EAS1DX3019
VALVE JOINT
This valve joint "1" prevents fuel from flowing
out and is installed to the fuel tank breather
hose.
ECA1DX1001
NOTICE
In this installation, make sure the arrow fac-
es the fuel tank and also downward.
EAS1DX3020
SPARK PLUG WRENCH
This spark plug wrench "1" is used to remove
and install the spark plug.
EAS1DX3021
NIPPLE WRENCH
This nipple wrench "1" is used to tighten the
spoke.
EAS1DX3022
HANDLEBAR PROTECTOR
Install the handlebar protector "1" so that the
notch "a" face backward.
EAS1DX3023
HOOK (FUEL TANK)
The hook tank "1" is used to support the fuel
tank during maintenance.
EAS1DX3024
FUEL HOSE JOINT COVER
The fuel hose joint covers "1" are used to pre-
vent mud, dust, and other foreign material from
entering the fuel pump when the fuel hose is
disconnected.
1
1
1
1
a
1
1

IMPORTANT INFORMATION
1-8
EAS1DX3025
COUPLER FOR CONNECTING OPTIONAL
PART
This coupler "1" is used for connection to an op-
tional Power Tuner and so on.
ECA1DX1002
NOTICE
When no optional parts, etc. are connected,
connect the connection terminal to the orig-
inal coupler.
Before removing the coupler, thoroughly
wipe off any mud or water stuck to it.
The GYTR Power Tuner is optional.
EAS20180
IMPORTANT INFORMATION
EAS1DX3026
PREPARATION FOR REMOVAL AND DIS-
ASSEMBLY
1. Before removal and disassembly, remove all
dirt, mud, dust and foreign material.
2. Use only the proper tools and cleaning
equipment.
Refer to “SPECIAL TOOLS” on page 1-15.
3. When disassembling, always keep mated
parts together. This includes gears, cylin-
ders, pistons and other parts that have been
“mated” through normal wear. Mated parts
must always be reused or replaced as an as-
sembly.
4. During disassembly, clean all of the parts
and place them in trays in the order of disas-
sembly. This will speed up assembly and al-
low for the correct installation of all parts.
5. Keep all parts away from any source of fire.
EAS1DX3027
REPLACEMENT PARTS
Use only genuine Yamaha parts for all replace-
ments. Use oil and grease recommended by
Yamaha for all lubrication jobs. Other brands
may be similar in function and appearance, but
inferior in quality.
Part name Part number
GYTR Power Tuner 33D-H59C0-V0-00
1