diagram YAMAHA YZ426F 2000 Owners Manual

EC083000
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.,
l
Bearings
Pitting/damage
®
Replace.
EC084002
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. Extent of removal
5
is provided in the job instruction chart to save the trouble of an unneces-
sary removal job.
6. For jobs requiring more information, the step-by-step format supplements
6
are given in addi-
tion to the exploded diagram and job instruction chart.

AUFBAU
Diese Anleitung wurde zusammengestellt, um
dem Benutzer ein leicht verständliches Nach-
schlagewerk in die Hand zu geben, in dem alle
dargestellten Arbeitsvorgänge (Ein- und Aus-
bau, Zerlegung und Zusammenbau, Prüfung
und Reparatur) detailliert und in der entspre-
chenden Reihenfolge beschrieben sind.
Je nach Zustand eines fehlerhaften Bauteils
weist ein Pfeilsymbol auf die erforderliche
Maßnahme hin. Beispiel:
l
Lager
Pitting/Beschädigung
®
Erneuern.
LESEN DER BESCHREIBUNGEN
Um bei der Identifikation der Teile zu helfen
und die Arbeitsschritte zu verdeutlichen, sind
Explosionsdiagramme am Beginn jedes Aus-
bau- und Demontageabschnittes dargestellt.
1. Für die Ausbau- und Demontagearbeiten
ist meistens ein übersichtliches Explosi-
onsdiagramm
1
dargestellt.
2. Die Nummern
2
in dem Explosionsdia-
gramm sind in der Reihenfolge der Arbei-
ten aufgeführt. Eine in einen Kreis
eingeschriebene Nummer bezeichnet
einen Demontageschritt.
3. Eine Erläuterung der Arbeiten und Hin-
weise ist durch ablesefreundliche Symbol-
markierungen
3
gegeben. Die
Bedeutungen der Symbolmarkierungen
sind auf der nächsten Seite aufgeführt.
4. Eine Arbeitsanweisungstabelle
4
beglei-
tet das Explosionsdiagramm und gibt die
Arbeitsreihenfolge, Bezeichnung der Teile,
Hinweise zu den Arbeiten usw. an.
5. Der Umfang des Ausbaus
5
ist in der
Arbeitsanweisungstabelle aufgeführt, um
nicht erforderliche Ausbauarbeiten zu ver-
meiden.
6. Für Arbeiten, für die weitere Informationen
benötigt werden, sind schrittweise Ergän-
zungen
6
zusätzlich zu dem Explosions-
diagramm und der
Arbeitsanweisungstabelle aufgeführt.
FORMAT DU MANUEL
Dans ce manuel, toutes les procédures sont décrites
pas à pas. Les informations ont été condensées pour
fournir au mécanicien un guide pratique et facile à
lire, contenant des explications claires pour toutes
les procédures de démontage, réparation, remon-
tage et vérification.
Dans ce nouveau format, l’état d’un composant
défectueux est suivi d’une flèche qui indique les
mesures à prendre. Exemple:
l
Roulements
Piqûres/endommagement
®
Remplacer.
COMMENT LIRE LES DESCRIPTIONS
Chaque section détaillant des étapes de démontage
ou de remontage est précédée de vues en éclaté qui
permettent de clarifier ces opérations.
1. Exemple de vue en éclaté
1
clarifiant les opé-
rations de démontage et de remontage.
2. Sur les vues en éclaté, les pièces sont numéro-
tées
2
dans l’ordre des opérations à effectuer.
Un chiffre entouré d’un cercle correspond à une
étape de démontage.
3. Les vues en éclaté portent également des sym-
boles
3
qui rappellent des points importants à
ne pas oublier. La signification de ces symboles
est expliquée à la page suivante.
4. Les vues en éclaté sont suivies d’un tableau
4
fournissant l’ordre des opérations, le nom des
pièces, des remarques, etc.
5. Pour éviter la dépose superflue de pièces,
l’étendue de la dépose
5
est indiquée dans le
tableau de description du travail.
6. Pour les travaux qui demandent des explica-
tions supplémentaires, la vue en éclaté et le
tableau sont suivis d’une description détaillée
6
des opérations.

EC085001
ILLUSTRATED SYMBOLS
(Refer to the illustration)
Illustrated symbols
1
to
7
are designed as
thumb tabs to indicate the chapter’s number
and content.
1
General information
2
Specifications
3
Regular inspection and adjustments
4
Engine
5
Chassis
6
Electrical
7
Tuning
Illustrated symbols
8
to
D
are used to identify
the specifications appearing in the text.
8
With engine mounted
9
Special tool
0
Filling fluid
A
Lubricant
B
Tightening
C
Specified value, Service limit
D
Resistance (
W
), Voltage (V), Electric current (A)
Illustrated symbols
E
to
I
in the exploded
diagrams indicate grade of lubricant and loca-
tion of lubrication point.
E
Apply gear oil
F
Apply engine oil
G
Apply molybdenum disulfide oil
H
Apply lightweight lithium-soap base grease
I
Apply molybdenum disulfide grease
Illustrated symbols
J to K in the exploded
diagrams indicate where to apply a locking
agent and where to install new parts.
JApply locking agent (LOCTITE®)
KUse new one 12
34
56
78
90
AB
CD
EFG
HI
JK
GEN
INFOSPEC
INSP
ADJENG
CHAS–+ELEC
TUN
T R..
GME
BM
New

EC0A0000
CONTENTS
CHAPTER 1
GENERAL INFORMATION
DESCRIPTION
.......................................... 1-1
MACHINE IDENTIFICATION
.................... 1-2
IMPORTANT INFORMATION
................... 1-3
CHECKING OF CONNECTION
................ 1-5
SPECIAL TOOLS
...................................... 1-6
CONTROL FUNCTIONS
........................... 1-9
FUEL
....................................................... 1-12
STARTING AND BREAK-IN
................... 1-13
TORQUE-CHECK POINTS
..................... 1-17
CLEANING AND STORAGE
.................. 1-18
CHAPTER 2
SPECIFICATIONS
GENERAL SPECIFICATIONS
.................. 2-1
MAINTENANCE SPECIFICATIONS
......... 2-4
GENERAL TORQUE
SPECIFICATIONS
.................................. 2-18
DEFINITION OF UNITS
.......................... 2-18
LUBRICATION DIAGRAMS
................... 2-19
CABLE ROUTING DIAGRAM
................ 2-21
CHAPTER 3
REGULAR INSPECTION AND
ADJUSTMENTS
MAINTENANCE INTERVALS
................... 3-1
PRE-OPERATION INSPECTION AND
MAINTENANCE
........................................ 3-4
ENGINE
..................................................... 3-5
CHASSIS
................................................. 3-24
ELECTRICAL
.......................................... 3-45

CHAPTER 6
ELECTRICAL
ELECTRICAL COMPONENTS AND
WIRING DIAGRAM
................................... 6-1
MAP-CONTROLLED CDI UNIT
................ 6-2
IGNITION SYSTEM
................................... 6-3
TPS (THROTTLE POSITION SENSOR)
SYSTEM
..................................................... 6-7
CHAPTER 7
TUNING
ENGINE
..................................................... 7-1
CHASSIS
................................................. 7-10

2 - 10
CARACTERISTIQUES D’ENTRETIEN
SPEC

Article Standard
Diagramme de graissage:
Graissage sous pression
Barbotage
Crépine à huile
Carter d’huile
Rotor de pompe à huile 1
Rotor de pompe à huile 2
Réservoir d’huile
Filtre à huile
Bille d’arrêt
Culasse
Maneton de bielleAxe de pistonPiston
Arbre secondaireArbre primaireEngrenage de la transmission
Arbre à cames
Poussoir de soupape

2 - 19
SPEC

LUBRICATION DIAGRAMS
LUBRICATION DIAGRAMS
1
Oil delivery pipe
2
Intake camshaft
3
Exhaust camshaft
4
Oil filter
5
Oil pump
6
Main axle
7
Drive axle

2 - 20
SPEC

LUBRICATION DIAGRAMS
1
Camshaft
2
Connecting rod
3
Oil filter
4
Crankshaft
5
Main axle
6
Drive axle
7
Oil delivery pipe

2 - 21
SPEC

CABLE ROUTING DIAGRAM
EC240000
CABLE ROUTING DIAGRAM
1
Hose guide
2
Brake hose
3
Fuel tank breather hose
4
Oil tank breather hose
5
Clamp
6
“ENGINE STOP” button lead
7
Sub wire harness
8
TPS (throttle position sensor)
lead
9
Neutral switch lead
0
Oil hose
A
Hose holder
B
CDI magneto lead
C
Clutch cable
D
Cylinder head breather hose
E
Carburetor breather hose
F
Overflow hose

Pass the clutch cable through
the cable guide.
õ
Pass the fuel tank breather
hose between the handlebar
and tension bar, then insert its
end into the hole of the num-
ber plate.
‚
Pass the decompression cable
and “ENGINE STOP” button
lead under the frame.
ë
Pass the “ENGINE STOP” but-
ton lead along the inner side of
the decompression cable.
ä
Fasten the CDI magneto lead,
neutral switch lead and
“ENGINE STOP” button lead
to the frame with a plastic lock-
ing tie and cut off the tie end.
ì
Pass the “ENGINE STOP”
button lead along the inner
side of the oil tank breather
hose.
í
Fasten the sub wire harness
and “ENGINE STOP” button
lead to the frame with a plas-
tic locking tie and cut off the
tie end.
î
Pass the cylinder head breather
hose along the right side of the
oil tank breather hose.
é
Fasten the sub wire harness to
the frame with a plastic locking
tie and cut off the tie end.
ï
Fasten the TPS lead (in the
sub wire harness) under the
frame.

2 - 22
SPEC

CABLE ROUTING DIAGRAM
ð
Fasten the TPS lead under the
coupler to the frame with a plas-
tic locking tie.
ñPass the carburetor breather
hose and overflow hose
between the connecting rod and
cross tube (frame).
÷Fasten the neutral switch lead
and oil hose together with a
plastic locking tie and cut off the
tie end.
öFasten the cylinder head
breather hose and neutral switch
lead to the frame with a plastic
locking tie.
¯Fasten the neutral switch lead to
the frame with a plastic band.¸Fasten the cylinder head
breather hose with the hose
holder.
ÎPass the clutch cable through
the cable guide.
åFasten the neutral switch lead
and CDI magneto lead
together with a plastic band.
êPass the clutch cable on the
inside the cylinder head
breather hose.
æPass the cylinder head
breather hose along the inner
side of the radiator pipe.
èPass the radiator breather
hose from the right side of the
frame to the left side, over
radiator pipe 1, along the innerside of radiator hose 4 and
the radiator, and between the
lower engine bracket, crank-
case, oil hose and the frame.
×Pass the clutch cable
between the frame and radia-
tor and over the lower boss on
the radiator.
ãPass the neutral switch lead
and CDI magneto lead over
the middle radiator mounting
boss. Then, pass the decom-
pression cable under the mid-
dle radiator mounting boss
and along the left side of the
neutral switch lead and CDI
magneto lead.