2007 YAMAHA YZ450F engine

4 - 99
ENGTRANSMISSION, SHIFT CAM AND SHIFT FORK
5. Install:
Shift fork 1 (L) 1
Shift fork 2 (C) 2
Shift fork 3 (R) 3
Shift cam 4
To main axle and drive axle.
NOTE:
Apply the molybdenum disulfide oil on the
shift fork grooves.
Apply engine oil to the shift cam groove,
bearing contact surface and shift fork shaft.
Mesh the shift fork #1 (L) with the 4th wheel
gear 5 and #3 (R) with the 5th wheel gear 7
on the drive axle.
Mesh the shift fork #2 (C) with the 3rd pinion
gear 6 on the main axle.
6. Install:
Transmission assembly 1
To crankcase (left) 2.
NOTE:
Apply the engine oil on the bearings and guide
bars.
7. Check:
Shifter operation
Transmission operation
Unsmooth operation → Repair.

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 removal
2 Wheel bearing removal
3 Brake disc removal
Extent of removal Order Part name Q’ty Remarks
FRONT WHEEL 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.
1 Bolt (axle holder) 4 Only loosening.
2 Nut (front wheel axle) 1
3 Front wheel axle 1
4 Front wheel 1
5 Collar 2
6 Oil seal 2
7 Bearing 2 Refer to “REMOVAL POINTS”.
8 Brake disc 1
2
31
3

5 - 2
CHAS
EC598100
REAR WHEEL
Extent of removal:
1 Rear wheel removal
2 Wheel bearing removal
3 Brake disc removal
Extent of removal Order Part name Q’ty Remarks
REAR WHEEL 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.
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”.
10 Brake disc 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 removal
2 Caliper removal
3 Master cylinder removal
Extent of removal Order Part name Q’ty Remarks
FRONT BRAKE 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.
Drain the brake fluid. Refer to “REMOVAL POINTS”.
1 Brake hose holder (protector) 2
2 Brake hose holder (caliper) 1
3 Union bolt 2
4 Brake hose 1
5 Pad pin plug 1 Remove when loosening the pad pin.
6 Pad pin 1 Loosen when disassembling the caliper.
7 Caliper 1
8Brake lever 1
9 Master cylinder bracket 1
10 Master cylinder 1
2
3
132

5 - 11
CHAS
EC5A8100
REAR BRAKE
Extent of removal:
1 Master cylinder removal
2 Brake hose removal
3 Caliper removal
Extent of removal Order Part name Q’ty Remarks
REAR BRAKE 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.
Rear wheel Refer to “FRONT WHEEL AND REAR
WHEEL” section.
Drain the brake fluid. Refer to “REMOVAL POINTS”.
1 Brake pedal 1
2 Master cylinder 1
3 Brake hose holder 2
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
3
1
321
FRONT BRAKE AND REAR BRAKE

5 - 26
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 no
danger 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 Refer to “SEAT, FUEL TANK AND SIDE
COVERS” section in the CHAPTER 4.
1 Protector 1
2 Pinch bolt (handle crown) 2 Only loosening.
3 Damper assembly 1 Loosen when disassembling the front
fork.
Use special tool.
Refer to “REMOVAL POINTS”.
4 Pinch bolt (under bracket) 2 Only loosening.
5 Front fork 1
1

5 - 43
CHAS
EC5B0000
HANDLEBAR
Extent of removal:
1 Handlebar removal
Extent of removal Order Part name Q’ty Remarks
HANDLEBAR REMOVAL
Preparation for removal Number plate Remove the band only.
1 Hot starter cable 1 Disconnect at the lever side.
2 Hot starter 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 #1 (pulled) 1 Disconnect at the throttle side.
9 Throttle cable #2 (pushed) 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
16 Handlebar holder (lower) 2
1
HANDLEBAR

5 - 43
CHAS
GUIDON
Organisation de la dépose:1 Dépose du guidon
Organisation de la dépose Ordre Nom de la pièce QtéRemarques
DEPOSE DU GUIDON
Préparation à la dépose Plaque d’identification Déposer le collier uniquement.
1Câble de démarrage à chaud 1 Déconnecter du côté levier.
2 Support du levier de démarrage à
chaud1
3Câble d’embrayage 1 Déconnecter du côté levier.
4 Support de levier d’embrayage 1
5 Bouton “COUPE-CIRCUIT DU
MOTEUR”1
6Maître-cylindre 1 Se reporter à “POINTS DE DEPOSE”.
7 Couvercle du logement de câble des
gaz1
8Câble des gaz n°1 (tiré)1Déconnecter du côté accélérateur.
9Câble des gaz n°2 (enfoncé)1Déconnecter du côté accélérateur.
10 Poignée (droite) 1 Se reporter à “POINTS DE DEPOSE”.
11 Guide de tube 1
12 Entretoise épaulée1
13 Poignée (gauche) 1 Se reporter à “POINTS DE DEPOSE”.
14 Support du guidon (supérieur) 2
15 Guidon 1
16 Support du guidon (inférieur) 2
1
LENKER
Arbeitsumfang:
1 Lenker demontieren
ArbeitsumfangReihen-
folgeBauteil Anz. Bemerkungen
LENKER DEMONTIEREN
Vorbereitungsarbeiten Nummernschild Nur das Band entfernen.
1 Warmstartzug 1 Hebelseitig lösen.
2 Warmstarthebel-Halterung 1
3 Kupplungszug 1 Hebelseitig lösen.
4 Kupplungshebel-Halterung 1
5 Motorstoppschalter “ENGINE
STOP”1
6 Hauptbremszylinder 1 Siehe unter “DEMONTAGE-EINZELHEI-
TEN”.
7 Gaszug-Abdeckung 1
8 Gasgeberzug 1 1 Gasdrehgriffseitig lösen.
9 Gasnehmerzug 2 1 Gasdrehgriffseitig lösen.
10 Lenkergriff rechts 1 Siehe unter “DEMONTAGE-EINZELHEI-
TEN”.
11 Führung 1
12 Distanzhülse 1
13 Lenkergriff links 1 Siehe unter “DEMONTAGE-EINZELHEI-
TEN”.
14 Lenker-Halterung (oben) 2
15 Lenker 1
16 Lenker-Halterung (unten) 2
1
GUIDON
LENKER