2007 YAMAHA YZ450F Engine

5 - 48
CHASHANDLEBAR
11. Install:
•“ENGINE STOP” button 1
•Clutch lever holder 2
•Bolt (clutch lever holder) 3
•Hot starter lever holder 4
•Bolt (hot starter lever holder) 5
•Clamp 6
NOTE:
•The “ENGINE STOP” button, clutch lever
holder and clamp should be installed accord-
ing to the dimensions shown.
•Pass the “ENGINE STOP” button lead in the
middle of the clutch lever holder.
T R..4 Nm (0.4 m · kg, 2.9 ft · lb)
T R..4 Nm (0.4 m · kg, 2.9 ft · lb)
12. Install:
•Clutch cable 1
•Hot starter cable 2
NOTE:
Apply the lithium soap base grease on the
clutch cable end and hot starter cable end.
13. Adjust:
•Clutch lever free play
Refer to “CLUTCH ADJUSTMENT” sec-
tion in the CHAPTER 3.
•Hot starter lever free play
Refer to “HOT STARTER LEVER
ADJUSTMENT” section in the CHAPTER
3.

5 - 48
CHAS
11. Monter:
Bouton “COUPE-CIRCUIT DU MOTEUR”
1
Support de levier d’embrayage 2
Boulon (support de levier d’embrayage) 3
Support du levier de démarrage à chaud 4
Boulon (support du levier de démarrage à
chaud) 5
Collier 6
N.B.:
Monter le bouton “COUPE-CIRCUIT DU
MOTEUR”, le support du levier d’embrayage et le
collier à pince en respectant les dimensions indiquées.
Acheminer le fil du bouton “COUPE-CIRCUIT
DU MOTEUR” au milieu du support du levier
d’embrayage.
T R..4 Nm (0,4 m · kg, 2,9 ft · lb)
T R..4 Nm (0,4 m · kg, 2,9 ft · lb)
12. Monter:
Câble d’embrayage 1
Câble de démarrage à chaud 2
N.B.:
Appliquer de la graisse à savon de lithium sur les
extrémités du câble d’embrayage et du câble de
démarrage à chaud.
13. Régler:
Jeu du levier d’embrayage
Se reporter à la section “REGLAGE DE
L’EMBRAYAGE” au CHAPITRE 3.
Jeu du levier de démarrage à chaud
Se reporter à la section “REGLAGE DU
LEVIER DE DEMARRAGE A CHAUD” au
CHAPITRE 3.11. Montieren:
Motorstoppschalter “ENGINE STOP” 1
Kupplungshebel-Halterung 2
Schraube (Kupplungshebel-Halterung) 3
Warmstarthebel-Halterung 4
Schraube (Warmstarthebel-Halterung) 5
Klemme 6
HINWEIS:
Der Motorstoppschalter “ENGINE STOP”,
die Kupplungshebel-Halterung und die
Klemme sind entsprechend den abgebilde-
ten Maßen zu montieren.
Das Motorstoppschalter-Kabel durch die
Mitte der Kupplungshebel-Halterung führen.
T R..4 Nm (0,4 m · kg, 2,9 ft · lb)
T R..4 Nm (0,4 m · kg, 2,9 ft · lb)
12. Montieren:
Kupplungszug 1
Warmstartzug 2
HINWEIS:
Die Kupplungszug- und Warmstartzug-Enden
mit Lithiumseifenfett bestreichen.
13. Einstellen:
Kupplungshebel-Spiel
Siehe unter “KUPPLUNG EINSTELLEN”
in KAPITEL 3.
Warmstarthebel-Spiel
Siehe unter “WARMSTARTHEBEL EIN-
STELLEN” in KAPITEL 3.
GUIDON
LENKER

5 - 49
CHAS
EC560000
STEERING
Extent of removal:
1 Under bracket removal
2 Bearing removal
Extent of removal Order Part name Q’ty Remarks
STEERING REMOVAL
WARNING
Support the machine securely so there is no
danger of it falling over.
Preparation for removal Hold the machine by placing the
suitable stand under the engine.
Number plate Refer to “SEAT, FUEL TANK AND SIDE
COVERS” section in the CHAPTER 4.
Handlebar Refer to “HANDLEBAR” section.
Front fender
1 Steering shaft nut 1
2 Front fork 2 Refer to “FRONT FORK” section.
3 Handle crown 1
4 Ring nut 1 Use special tool.
Refer to “REMOVAL POINTS”.
5 Under bracket 1
6 Bearing race cover 1
7 Bearing (upper) 1
8 Bearing (lower) 1
Refer to “REMOVAL POINTS”.
9 Bearing race 2
2
1
STEERING

5 - 54
CHASSWINGARM
EC570000
SWINGARM
Extent of removal:
1 Swingarm removal
Extent of removal Order Part name Q’ty Remarks
SWINGARM REMOVAL
WARNING
Support the machine securely so there is no
danger of it falling over.
Preparation for removal Hold the machine by placing the
suitable stand under the engine.
Brake hose holder
Refer to “FRONT BRAKE AND REAR
BRAKE” section.
Rear caliper
Bolt (brake pedal) Shift the brake pedal backward.
Drive chain
1 Chain support 1
2 Chain tensioner (lower) 1
3 Bolt (rear shock absorber-relay
arm)1 Hold the swingarm.
4 Bolt (connecting rod) 1
5 Pivot shaft 1
6 Swingarm 1
1

5 - 62
CHASREAR SHOCK ABSORBER
EC580000
REAR SHOCK ABSORBER
Extent of removal:
1 Rear shock absorber removal
2 Rear shock absorber disassembly
Extent of removal Order Part name Q’ty Remarks
REAR SHOCK ABSORBER
REMOVAL
WARNING
Support the machine securely so there is no
danger of it falling over.Preparation for removal Hold the machine by placing the
suitable stand under the engine.
Seat Refer to “SEAT, FUEL TANK AND SIDE
COVERS” section in the CHAPTER 4.
Silencer Refer to “EXHAUST PIPE AND
SILENCER” section in the CHAPTER 4.
1 Clamp (air filter joint) 1 Only loosening.
2Rear frame 1
3 Bolt (rear shock absorber-relay
arm)1 Hold the swingarm.
4 Bolt (rear shock absorber-frame) 1
5 Rear shock absorber 1
6 Locknut 1 Only loosening.
7 Adjuster 1 Only loosening.
8 Spring seat 2
1
2

6 - 1
–+ELECELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC600000
ELECTRICAL
EC610000
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC611000
ELECTRICAL COMPONENTS
1“ENGINE STOP” button
2TPS (throttle position sensor)
3Neutral switch
4CDI magneto
5Ignition coil
6Spark plug
7CDI unitCOLOR CODE
B ...................... Black
Br .................... Brown
G ..................... Green
L ...................... Blue
O ..................... Orange
P ...................... Pink
R ..................... Red
Sb.................... Sky blue
EC612000
WIRING DIAGRAM
71
5
62
3
4
B/WB/W
B/L
B/Y
SbSb
G/B
LYLY
P
B
B
B
B
G
O
WR
P
GW
R PP
B Br W
W
B/YGBr
G RR
OB Sb Sb Y
Y
WY
W
GG
B
PP
Br BrR R
OL
B SbY LL
B/L B/WB/W G/B
B B
B/L L Sb
B/L
G/B B/Y
B/Y
G/B B/W
O B/W
BrBr
W ..................... White
Y ...................... Yellow
B/L ................... Black/Blue
B/W .................. Black/White
B/Y ................... Black/Yellow
G/B................... Green/Black
L/W .................. Blue/White
R/W .................. Red/White

–+ELEC
ELEKTRISCHE ANLAGE
ELEKTRISCHE BAUTEILE UND
SCHALTPLAN
ELEKTRISCHE BAUTEILE
1Motorstoppschalter “ENGINE STOP”
2Drosselklappensensor
3Leerlaufschalter
4Lichtmaschine
5Zündspule
6Zündkerze
7Zündbox
FARB-CODIERUNG
B ...................... Schwarz
Br ..................... Braun
G ..................... Grün
L ...................... Blau
O ..................... Orange
P ...................... Rosa
R ...................... Rot
Sb .................... Himmelblau
W ..................... Weiß
Y ...................... Gelb
B/L ................... Schwarz/Blau
B/W ................. Schwarz/Weiß
B/Y .................. Schwarz/Gelb
G/B .................. Grün/Schwarz
L/W .................. Blau/Weiß
R/W ................. Rot/Weiß
SCHALTPLAN COMPOSANTS ELECTRIQUES ET SCHEMA DE CABLAGE
ELEKTRISCHE BAUTEILE UND SCHALTPLAN
PARTIE ELECTRIQUE
COMPOSANTS ELECTRIQUES ET
SCHEMA DE CABLAGE
COMPOSANTS ELECTRIQUES
1Bouton “ENGINE STOP”
2TPS (capteur de position de papillon des gaz)
3Contacteur de point mort
4Volant magnétique CDI
5Bobine d’allumage
6Bougie
7Boîtier CDI
CODES DE COULEUR
B .........................Noir
Br ........................Brun
G .........................Vert
L .........................Bleu
O .........................Orange
P..........................Rose
R .........................Rouge
Sb........................Bleu ciel
W ........................Blanc
Y .........................Jaune
B/L......................Noir/bleu
B/W ....................Noir/blanc
B/Y .....................Noir/jaune
G/B .....................Vert/noir
L/W ....................Bleu/blanc
R/W ....................Rouge/blanc
SCHEMA DE CABLAGE
6 - 1
6

–+ELEC
6 - 2
MAP-CONTROLLED CDI UNIT
MAP-CONTROLLED CDI UNIT
A map-controlled, CDI ignition system is used in the YZ450F.
The microcomputer in the CDI unit detects the engine speed and throttle position, thus determining
the optimum ignition timing through the entire operating range. In this way, quick throttle response
can be achieved according to various riding conditions.
Throttle position sensorCDI unitIgnition coil
Pickup coilCDI magneto rotor

Function of Component
Component Function
TPS
(throttle position sensor)Detects throttle valve opening and inputs it into the computer in the
CDI unit as a throttle opening signal.
Pickup coil Detects signal rotor revolutions and inputs them into the computer in
the CDI unit as engine revolution signals.
CDI unit The signals of the TPS and pickup coil sensor are analyzed by the
computer in the CDI unit, which then adjusts ignition timing for the
operation requirements.

Principal of 3-Dimensional Control
Conventionally, ignition timing was controlled only
by engine revolutions (2-dimensional control).
However, ignition timing needs advancement also
by engine load. Thus, accurate ignition timing can
be determined by adding throttle opening to deter-
mine ignition timing (3-dimensional control).
3-D Image Map of Ignition Timing
(different from actual characteristics)
Ignition timing
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