engine YAMAHA WR 450F 2007 Owners Manual

5. GASOLINE IS HIGHLY FLAMMABLE.
Always turn off the engine while refu-
eling. Take care to not spill any gaso-
line on the engine or exhaust system.
Never refuel in the vicinity of an open
flame, or while smoking.
6. 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, immediately wash skin
areas with soap and water, and
change your clothes.
7. ONLY OPERATE THE MACHINE IN AN
AREA WITH ADEQUATE VENTILA-
TION.
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 monox-
ide, which by itself is odorless and
colorless. Carbon monoxide is a dan-
gerous gas which can cause uncon-
sciousness or can be lethal.
8. 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.
9. THE ENGINE, EXHAUST PIPE, MUF-
FLER, 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 inspection or repair.
10. PROPERLY SECURE THE MACHINE
BEFORE TRANSPORTING IT.
When transporting the machine in
another vehicle, 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.

EC080000
HOW TO USE
THIS MANUAL
EC081000
PARTICULARLY IMPORTANT
INFORMATION
The Safety Alert Symbol means ATTENTION!
BECOME ALERT! YOUR SAFETY IS
INVOLVED!
Failure to follow WARNING instructions could
result in severe injury or death to the machine
operator, a bystander, or a person inspecting
or repairing the machine.
A CAUTION indicates special precautions that
must be taken to avoid damage to the
machine.
NOTE:
A NOTE provides key information to make pro-
cedures easier or clearer.
WA R N I N G
CAUTION:
EC082000
FINDING THE REQUIRED PAGE
1. This manual consists of seven chapters;
“General Information”, “Specifications”,
“Regular inspection and adjustments”,
“Engine”, “Chassis”, “Electrical” and “Tun-
ing”.
2. The table of contents is at the beginning of
the manual. Look over the general layout of
the book before finding then required chap-
ter 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.

ILLUSTRATED SYMBOLS
(Refer to the illustration)
Illustrated symbols 1 to 7 are designed as
thumb tabs to indicate the chapter’s number
and content.
1General information
2Specifications
3Regular inspection and adjustments
4Engine
5Chassis
6Electrical
7Tuning
Illustrated symbols 8 to D are used to identify
the specifications appearing in the text.
8With engine mounted
9Special tool
0Filling fluid
ALubricant
BTightening
CSpecified value, Service limit
DResistance (
Ω), Voltage (V), Electric current (A)
Illustrated symbols E to H in the exploded
diagrams indicate grade of lubricant and loca-
tion of lubrication point.
EApply engine oil
FApply molybdenum disulfide oil
GApply lightweight lithium-soap base grease
HApply molybdenum disulfide grease
Illustrated symbols I to J in the exploded
diagrams indicate where to apply a locking
agent and where to install new parts.
IApply locking agent (LOCTITE®)
JUse new one 12
34
56
78
90
AB
CD
EF
GH
IJ
GEN
INFOSPEC
INSP
ADJ
ENG
CHAS–+ELEC
TUN
T R..
EM
BM
New

EC090010
INDEX
GENERAL INFORMATION
SPECIFICATIONS
REGULAR INSPECTION AND ADJUSTMENTS
ENGINE
CHASSIS
ELECTRICAL
TUNING

EC0A0000
CONTENTS
CHAPTER 1
GENERAL INFORMATION
DESCRIPTION
...........................................1-1
MACHINE IDENTIFICATION
.....................1-2
IMPORTANT INFORMATION
....................1-3
CHECKING OF CONNECTION
.................1-6
SPECIAL TOOLS
......................................1-7
CONTROL FUNCTIONS
..........................1-10
MULTI-FUNCTION DISPLAY
..................1-14
FUEL
........................................................1-21
STARTING AND BREAK-IN
....................1-22
TORQUE-CHECK POINTS
......................1-26
CLEANING AND STORAGE
...................1-27
CHAPTER 2
SPECIFICATIONS
GENERAL SPECIFICATIONS
...................2-1
MAINTENANCE SPECIFICATIONS
..........2-4
GENERAL TORQUE
SPECIFICATIONS
...................................2-20
DEFINITION OF UNITS
...........................2-20
LUBRICATION DIAGRAMS
....................2-21
CABLE ROUTING DIAGRAM
.................2-23
CHAPTER 3
REGULAR INSPECTION AND
ADJUSTMENTS
MAINTENANCE INTERVALS
...................3-1
PRE-OPERATION INSPECTION
AND MAINTENANCE
................................3-4
ENGINE
......................................................3-5
CHASSIS
.................................................3-25
ELECTRICAL
...........................................3-48

CHAPTER 4
ENGINE
SEAT, FUEL TANK
AND SIDE COVERS ..................................4-1
EXHAUST PIPE AND SILENCER .............4-3
RADIATOR ................................................4-5
CARBURETOR ..........................................4-8
AIR INDUCTION SYSTEM ......................4-22
CAMSHAFTS ...........................................4-24
CYLINDER HEAD ....................................4-33
VALVES AND VALVE SPRINGS ............4-37
CYLINDER AND PISTON ........................4-46
CLUTCH ...................................................4-52
OIL FILTER, WATER PUMP
AND CRANKCASE COVER (RIGHT) .....4-59
BALANCER .............................................4-66
OIL PUMP ................................................4-70
KICK AXLE AND SHIFT SHAFT .............4-74
AC MAGNETO
AND STARTER CLUTCH ........................4-82
ENGINE REMOVAL .................................4-89
CRANKCASE AND CRANKSHAFT ........4-95
TRANSMISSION, SHIFT CAM
AND SHIFT FORK .................................4-104
CHAPTER 5
CHASSIS
FRONT WHEEL AND REAR WHEEL .......5-1
FRONT BRAKE AND REAR BRAKE .....5-10
FRONT FORK ..........................................5-26
HANDLEBAR ...........................................5-39
STEERING ...............................................5-46
SWINGARM .............................................5-52
REAR SHOCK ABSORBER ....................5-60

CHAPTER 6
ELECTRICAL
ELECTRICAL COMPONENTS
AND WIRING DIAGRAM ...........................6-1
IGNITION SYSTEM ....................................6-2
ELECTRIC STARTING SYSTEM ..............6-6
CHARGING SYSTEM ..............................6-16
TPS (THROTTLE POSITION SENSOR)
SYSTEM ...................................................6-18
LIGHTING SYSTEM ................................6-23
SIGNALING SYSTEM ..............................6-26
CHAPTER 7
TUNING
ENGINE ......................................................7-1
CHASSIS ...................................................7-9

GEN
INFO
1 - 1
DESCRIPTION
EC100000
GENERAL INFORMATION
EC110000
DESCRIPTION
1Clutch lever
2Hot starter lever
3“ENGINE STOP” button
4Multi-function display
5Main switch
6Start switch
7Front brake lever
8Throttle grip
9Radiator cap
0Fuel tank cap
ATaillight
BKickstarter
CFuel tank
DHeadlight
ERadiator
FCoolant drain boltGRear brake pedal
HValve joint
IFuel cock
JCold starter knob
KAir cleaner
LCatch tank
MDrive chain
NShift pedal
OOil dipstick
PFront fork
NOTE:
The machine you have purchased may differ
slightly from those shown in the following.
Designs and specifications are subject to
change without notice.

GEN
INFO
ALLGEMEINE
ANGABEN
FAHRZEUGBESCHREI-
BUNG
1Kupplungshebel
2Warmstarthebel
3Motorstoppschalter “ENGINE STOP”
4Multifunktionsanzeige
5Zündschalter
6Starterschalter
7Handbremshebel
8Gasdrehgriff
9Kühlerverschlussdeckel
0Tankverschluss
ARücklicht
BKickstarterhebel
CKraftstofftank
DScheinwerfer
EKühler
FKühlflüssigkeits-Ablassschraube
GFußbremshebel
HVentilverbindung
IKraftstoffhahn
JChokehebel
KLuftfilter
LAuffangtank
MAntriebskette
NFußschalthebel
OÖlmessstab
PTeleskopgabel
HINWEIS:
Die Abbildungen in vorliegender
Anleitung können leicht vom
eigentlichen Modell abweichen
und dienen daher lediglich zur
Bezugnahme.
Änderungen an Design und techni-
schen Daten jederzeit vorbehalten.
RENSEIGNEMENTS
GENERAUX
DESCRIPTION
1Levier d’embrayage
2Levier de démarrage à chaud
3Bouton “ENGINE STOP”
4Ecran multifonction
5Contacteur à clé
6Contacteur du démarreur
7Levier de frein avant
8Poignée des gaz
9Bouchon de radiateur
0Bouchon du réservoir de carburant
AFeu arrière
BKick
CRéservoir de carburant
DPhare
ERadiateur
FBoulon de vidange du liquide de refroi-
dissement
GPédale de frein arrière
HClapet de reniflard
IRobinet de carburant
JCommande de départ à froid
KFiltre à air
LRéservoir de récupération
MChaîne de transmission
NSélecteur
OJauge d’huile
PFourche
N.B.:
Votre moto diffère peut-être partielle-
ment de celle montrée sur ces photos.
La conception et les caractéristiques
peuvent être modifiées sans préavis.
INFORMACIÓN
GENERAL
DESCRIPCIÓN
1Maneta de embrague
2Mando de arranque en caliente
3Botón “ENGINE STOP” (paro del motor)
4Visor multifunción
5Interruptor principal
6Interruptor de arranque
7Maneta de freno delantero
8Puño del acelerador
9Tapón del radiador
0Tapón del depósito de combustible
APiloto trasero
BPedal de arranque
CDepósito de combustible
DFaro
ERadiador
FTornillo de vaciado del refrigerante
GPedal de freno trasero
HUnión con válvula
ILlave de paso del combustible
JMando de arranque en frío
KDepurador de aire
LDepósito de recuperación
MCadena de transmisión
NPedal de cambio
OVarilla de nivel de aceite
PHorquilla delantera
NOTA:
Puede haber ligeras diferencias entre
la máquina que ha comprado y las que
se muestran a continuación.
Los diseños y especificaciones pueden
ser modificados sin previo aviso.
DESCRIPTION
FAHRZEUGBESCHREIBUNG
DESCRIPCIÓN
1 - 1
1

1 - 2
GEN
INFO
MACHINE IDENTIFICATION
EC120001
MACHINE IDENTIFICATION
There are two significant reasons for knowing
the serial number of your machine:
1. When ordering parts, you can give the
number to your Yamaha dealer for positive
identification of the model you own.
2. If your machine is stolen, the authorities will
need the number to search for and identify
your machine.
EC121001
VEHICLE IDENTIFICATION NUMBER
The vehicle identification number 1 is
stamped on the right of the steering head pipe.
EC123001
ENGINE SERIAL NUMBER
The engine serial number 1 is stamped into
the elevated part of the right-side of the
engine.
1
EC124000
MODEL LABEL
The model label 1 is affixed to the frame
under the rider’s seat. This information will be
needed to order spare parts.