2007 YAMAHA WR 450F transmission

4 - 102
ENGCRANKCASE AND CRANKSHAFT
NOTE:
Hold the connecting rod at top dead center
with one hand while turning the nut of the
installing tool with the other. Operate the
installing tool until the crankshaft bottoms
against the bearing.
Before installing the crankshaft, clean the
contacting surface of crankcase.
CAUTION:
Do not use a hammer to drive in the crank-
shaft.
2. Check:
Shifter operation
Transmission operation
Unsmooth operation → Repair.
3. Install:
Oil strainer 1
Bolt (oil strainer) 2
4. Apply:
Sealant
On the crankcase (right).
NOTE:
Clean the contacting surface of crankcase (left
and right) before applying the sealant.
YAMAHA Bond No. 1215
(ThreeBond® No. 1215):
90890-85505
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)

4 - 103
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:
Hose guide 1
Clutch cable holder 2
Bolt (clutch cable holder)
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 surface.
9. Apply:
Engine oil
To the crank pin, bearing and oil delivery
hole.
10. Check:
Crankshaft and transmission operation.
Unsmooth operation → Repair.
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
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 - 104
ENGTRANSMISSION, SHIFT CAM AND SHIFT FORK
TRANSMISSION, SHIFT CAM AND SHIFT FORK
TRANSMISSION, SHIFT CAM AND SHIFT FORK
Extent of removal:
1 Shift fork, shift cam, main axle and drive axle removal
Extent of removal Order Part name Q’ty Remarks
TRANSMISSION, SHIFT CAM
AND SHIFT FORK REMOVAL
Preparation for removal Engine Refer to “ENGINE REMOVAL” section.
Separate the crankcase. Refer to “CRANKCASE AND CRANK-
SHAFT” section.
1 Main axle 1
Refer to “REMOVAL POINTS”. 2 Drive axle 1
3Shift cam 1
4 Shift fork 3 1
5 Shift fork 2 1
6 Shift fork 1 1
7 Collar 1
1

4 - 105
ENGTRANSMISSION, SHIFT CAM AND SHIFT FORK
EC4H3000
REMOVAL POINTS
Shift fork, shaft cam and transmission
1. Remove:
Main axle 1
Drive axle 2
Shift cam
Shift fork 3
Shift fork 2
Shift fork 1
NOTE:
Remove assembly with the collar 3 installed
to the crankcase.
Remove assembly carefully. Note the posi-
tion of each part. Pay particular attention to
the location and direction of shift forks.
Remove the main axle, drive axle, shift cam
and shift fork all together by tapping lightly on
the transmission drive axle with a soft ham-
mer.
EC4H4000
INSPECTION
EC4H4200
Gears
1. Inspect:
Matching dog a
Gear teeth b
Shift fork groove c
Wear/damage → Replace.
2. Inspect:
O-ring 1
Damage → Replace.
3. Check:
Gears movement
Unsmooth movement → Repair or
replace.

ENG
4 - 105
DEMONTAGE-EINZELHEITEN
Schaltgabeln, Schaltwalze und
Getriebe
1. Demontieren:
Eingangswelle
1
Ausgangswelle
2
Schaltwalze
Schaltgabel 3
Schaltgabel 2
Schaltgabel 1
HINWEIS:
Die Baugruppe mit der am Kurbel-
gehäuse montierten Distanzhülse
3 demontieren.
Die Baugruppe vorsichtig demontie-
ren. Die entsprechende Einbaulage
sämtlicher Teile fest halten. Der
Lage und Ausrichtung der Schaltga-
beln besondere Achtung schenken.
Eingangswelle, Ausgangswelle,
Schaltwalze und Schaltgabeln
gemeinsam ausbauen durch leich-
tes Klopfen auf die Ausgangswelle
mit einem Gummihammer.
KONTROLLE
Zahnräder
1. Kontrollieren:
Schaltklauen
a
Verzahnung
b
Schaltgabel-Führungsnut
c
Verschlissen/beschädigt
→
Erneuern.
2. Kontrollieren:
O-Ring
1
Beschädigt
→ Erneuern.
3. Kontrollieren:
Beweglichkeit der Zahnräder
Fest
→ Instand setzen, ggf.
erneuern. POINTS DE DEPOSE
Fourchette de sélection, tambour et
boîte de vitesses
1. Déposer:
Arbre primaire 1
Arbre secondaire 2
Tambour
Fourchette de sélection 3
Fourchette de sélection 2
Fourchette de sélection 1
N.B.:
Déposer l’ensemble avec l’entretoise
épaulée 3 monté sur le carter.
Déposer avec précaution. Prendre note
de la position de chaque pièce. Bien
noter la position et l’orientation des
fourchettes de sélection.
Déposer ensemble l’arbre primaire,
l’arbre secondaire, le tambour et la
fourchette de sélection en tapant légè-
rement sur l’arbre secondaire de la
transmission à l’aide d’un marteau en
plastique.
CONTROLE
Pignons
1. Contrôler:
Crabot d’accouplement a
Dents du pignon b
Gorge de fourchette de sélection
c
Usure/endommagement → Rem-
placer.
2. Contrôler:
Joint torique 1
Endommagement → Remplacer.
3. Contrôler:
Rotation des pignons
Mouvement irrégulier → Répa-
rer ou remplacer.PUNTOS DE DESMONTAJE
Horquilla de cambio, leva de cambio y
caja de cambios
1. Extraer:
Eje principal 1
Eje posterior 2
Leva de cambio
Horquilla de cambio 3
Horquilla de cambio 2
Horquilla de cambio 1
NOTA:
Extraiga el conjunto con el casquillo
3 montado en el cárter.
Extraiga el conjunto con cuidado.
Anote la posición de cada pieza.
Preste mucha atención a la situación y
dirección de las horquillas de cambio.
Extraiga el eje principal, el eje poste-
rior, la leva de cambio y la horquilla
de cambio, todo junto, golpeando lige-
ramente el eje posterior de la caja de
cambios con un mazo blando.
COMPROBACIÓN
Engranajes
1. Comprobar:
Desplazable correspondiente a
Dientes de engranaje b
Ranura de la horquilla de cambio
c
Desgaste/daños → Cambiar.
2. Comprobar:
Junta tórica 1
Dañada → Cambiar.
3. Comprobar:
Movimiento de los engranajes
Movimiento no suave → Reparar
o cambiar.
BOITE DE VITESSES, TAMBOUR ET FOURCHETTES DE SELECTION
GETRIEBE, SCHALTWALZE UND SCHALTGABELN
CAJA DE CAMBIOS, LEVA DE CAMBIO Y HORQUILLA DE CAMBIO

4 - 106
ENGTRANSMISSION, SHIFT CAM AND SHIFT FORK
EC4H4600
Bearing
1. Inspect:
Bearing 1
Rotate inner race with a finger.
Rough spot/seizure → Replace.
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.

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ENGTRANSMISSION, SHIFT CAM AND SHIFT FORK
ASSEMBLY AND INSTALLATION
Transmission
1. Install:
5th pinion gear (25T) 1
3rd pinion gear (16T) 2
Collar 3
4th pinion gear (20T) 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.
2. Install:
Collar 1
2nd wheel gear (26T) 2
4th wheel gear (21T) 3
3rd wheel gear (21T) 4
5th wheel gear (21T) 5
Collar 6
1st wheel gear (29T) 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.

4 - 108
ENGTRANSMISSION, SHIFT CAM AND SHIFT FORK
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 spacer into the crank-
case, pay careful attention to the crankcase
oil seal lip.
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.