2006 YAMAHA YZ450F transmission oil

4 - 94
ENGCRANKCASE AND CRANKSHAFT
5. Install:
Dowel pin 1
O-ring 2
Crankcase (right)
To crankcase (left).
NOTE:
Fit the crankcase (right) onto the crankcase
(left). Tap lightly on the case with soft ham-
mer.
When installing the crankcase, the connect-
ing rod should be positioned at TDC (top
dead center).
New
6. Tighten:
Bolt (hose guide) 1
Bolt (crankcase)
NOTE:
Tighten the crankcase tightening bolts in
stage, using a crisscross pattern.
7. Install:
Timing chain
Timing chain guide (rear)
Bolt (timing chain guide)
8. Remove:
Sealant
Forced out on the cylinder mating sur-
face.
9. Apply:
Engine oil
To the crank pin, bearing and oil delivery
hole.
10. Check:
Crankshaft and transmission operation.
Unsmooth operation → Repair.
T R..12 Nm (1.2 m · kg, 8.7 ft · lb)
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)

4 - 97
ENGTRANSMISSION, SHIFT CAM AND SHIFT FORK
EC4H4801
Shift fork, shift cam and segment
1. Inspect:
Shift fork 1
Wear/damage/scratches → Replace.
2. Inspect:
Shift cam 1
Segment 2
Bend/wear/damage → Replace.
3. Check:
Shift fork movement
Unsmooth operation → Replace shift
fork.
NOTE:
For a malfunctioning shift fork, replace not only
the shift fork itself but the two gears each adja-
cent to the shift fork.
ASSEMBLY AND INSTALLATION
Transmission
1. Install:
5th pinion gear (21T) 1
3rd pinion gear (18T) 2
Collar 3
4th pinion gear (22T) 4
2nd pinion gear (15T) 5
To main axle 6.
NOTE:
Apply the molybdenum disulfide oil on the
inner and end surface of the idler gear and on
the inner surface of the sliding gear, then
install.

4 - 98
ENGTRANSMISSION, SHIFT CAM AND SHIFT FORK
2. Install:
Collar 1
2nd wheel gear (23T) 2
4th wheel gear (24T) 3
3rd wheel gear (23T) 4
5th wheel gear (20T) 5
Collar 6
1st wheel gear (27T) 7
O-ring 8
To drive axle 9.
NOTE:
Apply the molybdenum disulfide oil on the
inner and end surface of the idler gear and
on the inner surface of the sliding gear, then
install.
Apply the lithium soap base grease on the O-
ring.
3. Install:
Plain washer 1
Circlip 2
NOTE:
Be sure the circlip sharp-edged corner a is
positioned opposite side to the plain washer
and gear b.
Install the circlip with its ends c settled
evenly on the spline crests.
cc
New
4. Install:
Collar 1
NOTE:
Apply the lithium soap base grease on the oil
seal lip.
When installing the collar into the crankcase,
pay careful attention to the crankcase oil seal
lip.

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.
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 - 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