engine YAMAHA YZ426F 2001 Owners Manual

5 - 1
CHAS
EC500000
CHASSIS
EC590000
FRONT WHEEL AND REAR WHEEL
EC598000
FRONT WHEEL
FRONT WHEEL AND REAR WHEEL
Extent of removal:1 Front wheel removal2 Wheel bearing removal
3 Break disc removal
Extent of removal Order Part name Q’ty Remarks
Preparation for removalFRONT WHEEL REMOVAL
Hold the machine by placing the
suitable stand under the engine.
WARNING
Support the machine securely so there is nodanger of it falling over.
1 Hose cover 1
2 Bolt (brake hose holder) 2 Only loosening.
3 Bolt (axle holder) 4 Only loosening.
4 Nut (front wheel axle) 1
5 Front wheel axle 1
6 Front wheel 1
7 Collar 2
8 Oil seal 2
9 Bearing 2 Refer to “REMOVAL POINTS”.
10Brake disk
1
2
31
3




5

5 - 2
CHAS

EC598100
REAR WHEEL
Extent of removal:
1
Rear wheel removal
2
Wheel bearing removal
3
Break disc removal
Extent of removal Order Part name Q’ty Remarks
Preparation for removal
REAR WHEEL REMOVAL
Hold the machine by placing the
suitable stand under the engine.
WARNING

Support the machine securely so there is no
danger of it falling over.
1 Nut (rear wheel axle) 1
2 Rear wheel axle 1
3 Chain puller 2
4 Rear wheel 1 Refer to “REMOVAL POINTS”.
5 Collar 2
6 Driven sprocket 1
7 Oil seal 2
8 Circlip 1
9 Bearing 2 Refer to “REMOVAL POINTS”.
10Brake disk
1
2
31
3

FRONT WHEEL AND REAR WHEEL

5 - 10
CHASFRONT BRAKE AND REAR BRAKE
EC5A0000
FRONT BRAKE AND REAR BRAKE
EC5A8000
FRONT BRAKE
Extent of removal:1 Brake hose removal2 Caliper removal
3 Master cylinder removal
Extent of removal Order Part name Q’ty Remarks
Preparation for removalFRONT BRAKE REMOVAL
Hold the machine by placing the
suitable stand under the engine.
Drain the brake fluid.
WARNING
Support the machine securely so there is nodanger of it falling over.
Refer to “REMOVAL POINTS”.
1 Hose cover 1
2 Brake hose holder 1
3 Bolt (brake hose holder) 2 Only loosening.
4 Union bolt 2
5 Brake hose 1
6 Pad pin plug 1 Remove when loosening the pad pin.
7 Pad pin 1 Loosen when disassembling the caliper.
8 Caliper 1
9 Brake lever 1
10 Master cylinder bracket 1
11 Master cylinder 1
2
3
1
3
2

5 - 11
CHAS
EC5A8100
REAR BRAKE
Extent of removal:1 Caliper removal2 Brake hose removal
3 Master cylinder removal
Extent of removal Order Part name Q’ty Remarks
Preparation for removalREAR BRAKE REMOVAL
Hold the machine by placing the
suitable stand under the engine.
WARNING
Support the machine securely so there is nodanger of it falling over.
Rear wheel Refer to “FRONT WHEEL AND REAR
WHEEL” section.
Drain the brake fluid. Refer to “REMOVAL POINTS”.
1 Pad pin plug 1 Remove when loosening the pad pin.
2 Pad pin 1 Loosen when disassembling the caliper.
3 Caliper 1
4 Brake hose holder 2
5 Union bolt 2
6 Brake hose 1
7 Brake pedal 1
8 Reservoir tank 1
9 Reservoir hose 1
10 Master cylinder 1
3
1
321
FRONT BRAKE AND REAR BRAKE

5 - 27
CHASFRONT FORK
EC550000
FRONT FORK
Extent of removal:1 Front fork removal
Extent of removal Order Part name Q’ty Remarks
Preparation for removalFRONT FORK REMOVAL
Hold the machine by placing the
suitable stand under the engine.
WARNING
Support the machine securely so there is nodanger of it falling over.
Front wheel Refer to “FRONT WHEEL AND REAR
WHEEL” section.
Front caliper Refer to “FRONT BRAKE AND REAR
BRAKE” section.
Number plate
Handlebar Refer to “HANDLEBAR” section.
1 Protector 1
2 Brake hose holder 2
3 Pinch bolt (handle crown) 2 Only loosening.
4 Cap bolt 1Loosen when disassembling the front fork.
5 Pinch bolt (under bracket) 2 Only loosening.
6 Front fork 1
1

5 - 40
CHAS

EC5B0000
HANDLEBAR
Extent of removal:
1
Handlebar removal
Extent of removal Order Part name Q’ty Remarks
Preparation for removal
HANDLEBAR REMOVAL
Number plate Remove the clamp portion only.
1 Decompression cable 1 Disconnect at the lever side.
2 Decompression lever holder 1
3 Clutch cable 1 Disconnect at the lever side.
4 Clutch lever holder 1
5 “ENGINE STOP” button 1
6 Master cylinder 1 Refer to “REMOVAL POINTS”.
7 Throttle cable cap 1
8 Throttle cable #2 (pushed) 1 Disconnect at the throttle side.
9 Throttle cable #1 (pulled) 1 Disconnect at the throttle side.
10 Grip (right) 1 Refer to “REMOVAL POINTS”.
11 Tube guide 1
12 Collar 1
13 Grip (left) 1 Refer to “REMOVAL POINTS”.
14 Handlebar holder (upper) 2
15 Handlebar 1
1

HANDLEBAR

5 - 40
CHAS
LENKER
Demontage-Arbeiten:1 Lenker demontieren
Demontage-ArbeitenReihen-
folgeBauteilAnz.Bemerkungen
Vorbereitung den Aus-
bauLENKER DEMONTIEREN
Nummernschild Nur die Befestigung demontieren.
1 Dekompressionszug 1 Hebelseitig demontieren.
2 Dekompressionshebel-Halterung 1
3 Kupplungszug 1 Hebelseitig demontieren.
4 Kupplungshebel-Halterung 1
5 Motorstoppschalter “ENGINE
STOP”1
6 Hauptbremszylinder 1 Siehe unter “AUSBAU”.
7 Gasseilzugkappe 1
8 Gaszug 2 1 Gasdrehgriffseitig demontieren.
9 Gaszug 1 1 Gasdrehgriffseitig demontieren.
10 Gasdrehgriff 1 Siehe unter “AUSBAU”.
11 Führungsrohr 1
12 Hülse 1
13 Lenkergriff (links) 1 Siehe unter “AUSBAU”.
14 Lenkerhalterung (oben) 2
15 Lenker 1
1
GUIDON
LENKER
GUIDON
Organisation de la dépose:1 Dépose du guidon
Organisation de la dépose Ordre Nom de pièce Qté Remarques
Préparation pour la
déposeDEPOSE DU GUIDON
Plaque de numéro Enlever seulement la partie fixée au guidon.
1 Câble de décompression 1 Déconnecter du côté levier.
2 Support du levier de décompression 1
3 Câble d’embrayage 1 Déconnecter du côté levier.
4 Support de levier d’embrayage 1
5 Bouton d’arrêt du moteur “ENGINE
STOP”1
6 Maître-cylindre 1 Se reporter à “POINTS DE DEPOSE”.
7 Capuchon de câble d’accélérateur 1
8 Câble d’accélérateur 2 (serré) 1 Déconnecter du côté accélérateur.
9 Câble d’accélérateur 1 (tiré) 1 Déconnecter du côté accélérateur.
10 Poignée (droite) 1 Se reporter à “POINTS DE DEPOSE”.
11 Guide de tube 1
12 Collerette 1
13 Poignée (gauche) 1 Se reporter à “POINTS DE DEPOSE”.
14 Support de guidon (supérieur) 2
15 Guidon 1
1

5 - 44
CHASHANDLEBAR
7. Install:
l“ENGINE STOP” button 1
lClutch lever holder 2
lBolt (clutch lever holder) 3
lDecompression lever holder 4
lBolt (decompression lever holder) 5
lClamp 6
T R..4 Nm (0.4 m · kg, 2.9 ft · lb)
T R..4 Nm (0.4 m · kg, 2.9 ft · lb)
NOTE:
lThe “ENGINE STOP” button, clutch lever
holder, decompression lever holder and
clamp should be installed according to the
dimensions shown.
lPass the “ENGINE STOP” button lead in the
middle of the clutch holder.
8. Install:
lClutch cable 1
lDecompression cable 2
NOTE:
Apply the lithium soap base grease on the
clutch cable end and decompression cable
end.
9. Adjust:
lClutch lever free play
Refer to “CLUTCH ADJUSTMENT”
section in the CHAPTER 3.
lDecompression lever free play
Refer to “DECOMPRESSION LEVER
ADJUSTMENT” section in the CHAP-
TER 3.
B
2
1
10. Clamp the clamp portion a of the num-
ber plate to the handlebar.
11. Insert the end of the fuel breather hose
1 into the hole of the number plate.

5 - 44
CHAS
GUIDON
LENKER
7. Montieren:
lMotorstoppschalter “ENGINE STOP” 1
lKupplungshebel-Halterung 2
lSchraube (Halterung) 3
lDekompressionshebel-Halterung 4
lSchraube (Dekompressionshebel-Hal-
terung) 5
lKabelbinder 6
T R..4 Nm (0,4 m · kg)
T R..4 Nm (0,4 m · kg)
HINWEIS:
lMotorstoppschalter, Kupplungshebel-Halte-
rung, Dekompressionshebel-Halterung und
Kabelbinder gemäß den in der Abbildung ge-
zeigten Abmessungen montieren.
lDas Motorstoppschalter-Kabel mittig durch
die Kupplungshebel-Halterung führen.
8. Montieren:
lKupplungszug 1
lDekompressionszug 2
HINWEIS:
Lithiumfett auf die Enden des Kupplungsseil-
zugs und des Dekompressionsseilzugs auftra-
gen.
9. Einstellen:
lKupplungszugspiel
Siehe unter “KUPPLUNG EINSTEL-
LEN” im KAPITEL 3.
lDekompressionszugspiel am
Hebeldrehpunkt
Siehe unter “EINSTELLUNG DES
DEKOMPRESSIONSHEBELS”.
10. Die Nummernschild-Befestigung a am
Lenker montieren.
11. Das Kraftstofftank-Entlüftungsschlauch-
Ende 1 durch die Bohrung im Nummern-
schild führen. 7. Monter:
lBouton d’arrêt du moteur “ENGINE
STOP” 1
lSupport de levier d’embrayage 2
lBoulon (support de levier d’embrayage) 3
lSupport du levier de décompresseur 4
lBoulon (support du levier de décompres-
seur) 5

lBride 6
T R..4 Nm (0,4 m · kg, 2,9 ft · lb)
T R..4 Nm (0,4 m · kg, 2,9 ft · lb)
N.B.:
lLe bouton d’arrêt du moteur “ENGINE STOP”,
le support de levier d’embrayage, le support du
levier de décompression et l’attache en plastique
doivent être installés en respectant les dimensions
indiquées.
lFaire passer le fil de bouton d’arrêt du moteur
“ENGINE STOP” au centre du support
d’embrayage.
8. Monter:
lCâble d’embrayage 1
lCâble de décompression 2
N.B.:
Enduire de graisse à base de savon au lithium
l’extrémité du câble d’embrayage et l’extrémité du
câble de décompression.
9. Régler:
lJeu du levier d’embrayage
Se reporter à la section “REGLAGE DE
L’EMBRAYAGE” du CHAPITRE 3.
lJeu au levier de décompression
Se reporter à la section “REGLAGE DU
LEVIER DE DECOMPRESSION”.
10. Fixer la partie de fixation a de la plaque de
numéro au guidon.
11. Introduire l’extrémité du conduit d’aération
de carburant 1 dans les trous de la plaque de
numéro.

5 - 45
CHAS
EC560000
STEERING
Extent of removal:1 Under bracket removal2 Bearing removal
Extent of removal Order Part name Q’ty Remarks
STEERING REMOVAL
WARNING
Support the machine securely so there is nodanger of it falling over.
Refer to “HANDLEBAR” section. Preparation for removal Hold the machine by placing the
suitable stand under the engine.
Number plate
Handlebar
Cable guide
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 Ball race cover 1
7 Bearing (upper) 1
8 Bearing (lower) 1 Refer to “REMOVAL POINTS”.
9 Ball race 2 Refer to “REMOVAL POINTS”.
2
1
STEERING