2005 YAMAHA YZ450F oil

4 - 98
ENGTRANSMISSION, SHIFT CAM AND SHIFT FORK
5. Install:
Shift fork 1 (L) 1
Shift fork 2 (R) 2
Shift cam 3
To main axle and drive axle.
NOTE:
Apply the molybdenum disulfide oil on the
shift fork grooves.
Mesh the shift fork #1 (L) with the 3rd pinion
gear 4 on the main axle.
Mesh the shift fork #2 (R) with the 4th wheel
gear 5 on the drive 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 - 3
CHASFRONT WHEEL AND REAR WHEEL
EC593000
REMOVAL POINTS
EC523101
Rear wheel
1. Remove:
Wheel 1
NOTE:
Push the wheel forward and remove the drive
chain 2.
EC513201
Wheel bearing (if necessary)
1. Remove:
Bearing 1
NOTE:
Remove the bearing using a general bearing
puller 2.
EC594000
INSPECTION
EC514100
Wheel
1. Measure:
Wheel runout
Out of limit → Repair/replace.
2. Inspect:
Bearing
Rotate inner race with a finger.
Rough spot/seizure → Replace.
NOTE:
Replace the bearings, oil seal and wheel collar
as a set.
Wheel runout limit:
Radial
1: 2.0 mm (0.08 in)
Lateral
2: 2.0 mm (0.08 in)

5 - 3
CHAS
POINTS DE DEPOSE
Roue arrière
1. Déposer:
Roue 1
N.B.:
Pousser la roue vers l’avant et déposer la chaîne de
transmission 2.
Roulement de roue (si nécessaire)
1. Déposer:
Roulement 1
N.B.:
Déposer le roulement à l’aide d’un arrache-roule-
ment courant 2.
CONTROLE
Roue
1. Mesurer:
Voile de roue
Hors spécifications → Réparer/remplacer.
Limite de voile de roue:
Radial 1: 2,0 mm (0,08 in)
Latéral 2: 2,0 mm (0,08 in)
2. Contrôler:
Roulement
Faire tourner la cage interne avec le doigt.
Rugosité/grippage → Remplacer.
N.B.:
Remplacer ensemble les roulements, la bague
d’étanchéité et l’entretoise épaulée de roue.DEMONTAGE-EINZELHEITEN
Hinterrad
1. Demontieren:
Rad 1
HINWEIS:
Das Hinterrad nach vorn drücken und die
Antriebskette 2 abnehmen.
Radlager (nach Bedarf)
1. Demontieren:
Lager 1
HINWEIS:
Das Lager mit einem Lageraustreiber 2 aus-
bauen.
KONTROLLE
Rad
1. Messen:
Felgenschlag
Nicht nach Vorgabe → Instand setzen,
ggf. erneuern.
Max. Felgenschlag:
Höhenschlag 1: 2,0 mm (0,08 in)
Seitenschlag 2: 2,0 mm (0,08 in)
2. Kontrollieren:
Lager
Den Innenlaufring mit den Fingern dre-
hen.
Stockend/fest → Erneuern.
HINWEIS:
Lager, Dichtring und Distanzhülse satzweise
erneuern.
ROUE AVANT ET ROUE ARRIERE
VORDER- UND HINTERRAD

5 - 4
CHAS
Axe de roue
1. Mesurer:
Déformations de l’axe de roue
Hors spécifications → Remplacer.
Utiliser le comparateur à cadran 1.
N.B.:
La valeur de flexion est égale à la moitié de la
valeur affichée sur le comparateur à cadran.
AVERTISSEMENT
Ne pas tenter de redresser un axe déformé.
Limite de flexion d’axe de roue:
0,5 mm (0,020 in)
Disque de frein
1. Mesurer:
Déflexion du disque de frein (disque de frein
arrière seulement)
Utiliser le comparateur à cadran 1.
Hors spécifications → Contrôler le voile de
roue.
Si le voile de roue est normal, remplacer le
disque de frein.
2. Mesurer:
Epaisseur du disque de frein a
Hors spécifications → Remplacer.
Limite de déflexion du disque de
frein:
Standard
Arrière—0,15 mm
(0,006 in)
Limite d’usure du disque de frein:
Standard
Avant3,0 mm (0,12 in) 2,5 mm (0,10 in)
Arrière4,0 mm (0,16 in) 3,5 mm (0,14 in)
Radachse
1. Messen:
Radachs-Verbiegung
Nicht nach Vorgabe → Erneuern.
Eine Meßuhr 1 verwenden.
HINWEIS:
Der von der Meßuhr angezeigte Wert ist zu
halbieren, um den Wert der Verbiegung zu
erhalten.
WARNUNG
Eine verbogene Radachse darf unter kei-
nen Umständen gerichtet werden.
Max. Radachs-Verbiegung
0,5 mm (0,020 in)
Bremsscheibe
1. Messen:
Bremsscheiben-Verzug (nur Hinterrad)
Eine Meßuhr 1 verwenden.
Nicht nach Vorgabe → Felgenschlag
kontrollieren.
Falls Felgenschlag in Ordnung ist, die
Bremsscheibe erneuern.
2. Messen:
Bremsscheiben-Stärke a
Nicht nach Vorgabe → Erneuern.
Max. Bremsscheiben-Verzug:
Standard
Hinten—0,15 mm
(0,006 in)
Min. Bremsscheiben-Stärke:
Standard
Vorn3,0 mm (0,12 in) 2,5 mm (0,10 in)
Hinten4,0 mm (0,16 in) 3,5 mm (0,14 in)
ROUE AVANT ET ROUE ARRIERE
VORDER- UND HINTERRAD

5 - 5
CHASFRONT WHEEL AND REAR WHEEL
EC595000
ASSEMBLY AND INSTALLATION
Front wheel
1. Install:
Bearing (left) 1
Spacer 2
Bearing (right) 3
Oil seal 4
NOTE:
Apply the lithium soap base grease on the
bearing and oil seal lip when installing.
Use a socket that matches the outside diam-
eter of the race of the bearing.
Left side of bearing shall be installed first.
Install the oil seal with its manufacture’s
marks or numbers facing outward.
CAUTION:
Do not strike the inner race of the bearing.
Contact should be made only with the outer
race.
2. Install:
Brake disc 1
Bolt (brake disc) 2
NOTE:
Tighten the bolts in stage, using a crisscross
pattern.
New
T R..12 Nm (1.2 m · kg, 8.7 ft · lb)
3. Install:
Collar 1
NOTE:
Apply the lithium soap base grease on the oil
seal lip.
Install the collars with their projections a
facing the wheel.
4. Install:
Wheel
NOTE:
Install the brake disc 1 between the brake
pads 2 correctly.

5 - 7
CHASFRONT WHEEL AND REAR WHEEL
Rear wheel
1. Install:
Bearing (right) 1
Circlip 2
Spacer 3
Bearing (left) 4
Oil seal 5
NOTE:
Apply the lithium soap base grease on the
bearing and oil seal lip when installing.
Install the bearing with seal facing outward.
Use a socket that matches the outside diam-
eter of the race of the bearing.
Right side of bearing shall be installed first.
Install the oil seal with its manufacture’s
marks or numbers facing outward.
CAUTION:
Do not strike the inner race of the bearing.
Contact should be made only with the outer
race.
New
New
2. Install:
Brake disc 1
Bolt (brake disc) 2
NOTE:
Tighten the bolts in stage, using a crisscross
pattern.
3. Install:
Driven sprocket 1
Bolt (driven sprocket) 2
Plain washer (driven sprocket) 3
Nut (driven sprocket) 4
NOTE:
Tighten the nuts in stage, using a crisscross
pattern.
T R..14 Nm (1.4 m · kg, 10 ft · lb)
T R..42 Nm (4.2 m · kg, 30 ft · lb)