lock YAMAHA YZ450F 2005 Workshop Manual

4 - 53
ENGCLUTCH
3. Bend the lock washer 1 tab.
4. Install:
Friction plate 1
Clutch plate 2
NOTE:
Install the clutch plates and friction plates
alternately on the clutch boss, starting with a
friction plate and ending with a friction plate.
Apply the engine oil on the friction plates and
clutch plates.
5. Install:
Bearing 1
Plain washer 2
Circlip 3
To push rod 1 4.
NOTE:
Apply the engine oil on the bearing and plain
washer.
New
6. Install:
Push rod 2 1
Ball 2
Push rod 1 3
NOTE:
Apply the engine oil on the push rod 1, 2 and
ball.

4 - 62
ENGBALANCER
BALANCER
BALANCER
Extent of removal:
1 Balancer drive gear
2 Balancer
Extent of removal Order Part name Q’ty Remarks
BALANCER REMOVAL
Preparation for removal Clutch housing Refer to “CLUTCH” section.
Crankcase cover (right) Refer to “OIL FILTER, WATER PUMP AND
CRANKCASE COVER (RIGHT)” section.
Stator Refer to “CDI MAGNETO” section.
1 Nut (primary drive gear) 1
Refer to “REMOVAL POINTS”.
2 Nut (balancer) 1
3 Conical washer 1
4 Primary drive gear 1
5 Balancer drive gear 1
6 Lock washer 1
7 Balancer driven gear 1
8 Balancer 1 Refer to “REMOVAL POINTS”.
2
1
2

4 - 63
ENGBALANCER
REMOVAL POINTS
Balancer drive gear and balancer driven
gear
1. Straighten the lock washer tab.
2. Loosen:
Nut (primary drive gear) 1
Nut (balancer) 2
NOTE:
Place an aluminum plate a between the teeth
of the balancer drive gear 3 and driven gear
4.
a 3
14
2
4 3
a
Balancer
1. Remove:
Balancer 1
NOTE:
When removing the balancer shaft, align the
center of the balancer shaft weight a along
the line connecting the centers of the crank-
shaft and balancer shaft.
INSPECTION
Primary drive gear, balancer drive gear and
balancer driven gear
1. Inspect:
Primary drive gear 1
Balancer drive gear 2
Balancer driven gear 3
Wear/damage → Replace.
Balancer
1. Inspect:
Balancer
Cracks/damage → Replace.

4 - 63
ENG
DEMONTAGE-EINZELHEITEN
Ausgleichswellen-Antriebsritzel und -rad
1. Die Lasche der Sicherungsscheibe umbie-
gen.
2. Lockern:
Mutter (Primärantriebsritzel) 1
Ausgleichswellen-Mutter 2
HINWEIS:
Ein Alu-Blechstück a zwischen das Antriebs-
ritzel 3 und das Antriebsrad 4 klemmen.
Ausgleichswelle
1. Demontieren:
Ausgleichswelle 1
HINWEIS:
Zur Demontage der Ausgleichswelle die Mitte
a des Ausgleichsgewichts auf die Mitte der
Ausgleichs- und Kurbelwellen ausrichten.
KONTROLLE
Primärantriebsritzel, Ausgleichswellen-
Antriebsritzel und -rad
1. Kontrollieren:
Primärantriebsritzel 1
Ausgleichswellen-Antriebsritzel 2
Ausgleichswellen-Antriebsrad 3
Verschlissen/beschädigt → Erneuern.
Ausgleichswelle
1. Kontrollieren:
Ausgleichswelle
Rissig/beschädigt → Erneuern.
BALANCIER
AUSGLEICHSWELLE
POINTS DE DEPOSE
Pignon menant et pignon mené du balancier
1. Redresser l’onglet de la rondelle-frein.
2. Desserrer:
Ecrou (pignon menant de transmission pri-
maire) 1
Ecrou (balancier) 2
N.B.:
Placer une plaque d’aluminium a entre les dents
du pignon menant 3 et du pignon mené 4 du
balancier.
Balancier
1. Déposer:
Balancier 1
N.B.:
Pour déposer l’arbre de balancier, aligner le centre
a du contrepoids d’arbre de balancier sur la ligne
raccordant les centres du vilebrequin et de l’arbre
de balancier.
CONTROLE
Pignon menant de transmission primaire,
pignon menant et pignon mené du balancier
1. Contrôler:
Pignon menant de transmission primaire 1
Pignon menant du balancier 2
Pignon mené du balancier 3
Usure/endommagement → Remplacer.
Balancier
1. Contrôler:
Balancier
Craquelures/endommagement → Remplacer.

4 - 64
ENGBALANCER
ASSEMBLY AND INSTALLATION
Balancer, balancer drive gear and balancer
driven gear
1. Install:
Balancer 1
NOTE:
When installing the balancer shaft, align the
center of the balancer shaft weight a along
the line connecting the centers of the crank-
shaft and balancer shaft.
2. Install:
Balancer driven gear 1
NOTE:
Install the balancer driven gear onto the bal-
ancer while aligning the punch mark a on the
balancer driven gear with the lower spline b
on the balancer end.
3. Install:
Balancer drive gear 1
NOTE:
Align the punched mark a on the balancer
drive gear with the punched mark b on the
balancer driven gear.
Align the punched mark c on the balancer
drive gear with the lower spline d on the
crankshaft.
4. Install:
Lock washer 1
Nut (balancer) 2
Primary drive gear 3
Conical washer 4
Nut (primary drive gear) 5
NOTE:
Apply engine oil to the contact surface and
threaded portion of the nut (primary drive
gear).
Place an aluminum plate a between the
teeth of the balancer drive gear 6 and driven
gear 7.
Install the primary drive gear with its weight
reduction holes b facing the engine.
Install the conical washer with its convex sur-
face c outward.
5. Bend the lock washer tab.
a 6
17
2
T R..50 Nm (5.0 m · kg, 36 ft · lb)
E
7
6a
c b
5
4
3
T R..110 Nm (11.0 m · kg, 80 ft · lb)

4 - 71
ENGKICK AXLE AND SHIFT SHAFT
REMOVAL POINTS
EC4B3101
Kick axle assembly
1. Remove:
Kick axle assembly 1
NOTE:
Unhook the torsion spring 2 from the hole a
in the crankcase.
EC4C3101
Shift guide and shift lever assembly
1. Remove:
Bolt (shift guide)
Shift guide 1
Shift lever assembly 2
NOTE:
The shift lever assembly is disassembled at
the same time as the shift guide.
EC4N3100
Segment
1. Remove:
Bolt (segment) 1
Segment 2
NOTE:
Turn the segment counterclockwise until it
stops and loosen the bolt.
INSPECTION
EC4C4200
Kick axle and ratchet wheel
1. Check:
Ratchet wheel 1 smooth movement
Unsmooth movement → Replace.
Kick axle 2
Wear/damage → Replace.
Spring 3
Broken → Replace.
EC4C4300
Kick gear, kick idle gear and ratchet wheel
1. Inspect:
Kick gear 1
Kick idle gear 2
Ratchet wheel 3
Gear teeth a
Ratchet teeth b
Wear/damage → Replace.

4 - 71
ENG
DEMONTAGE-EINZELHEITEN
Kickhebelwelle komplett
1. Demontieren:
Kickhebelwelle komplett 1
HINWEIS:
Die Torsionsfeder 2 aus der Bohrung a im
Kurbelgehäuse lösen.
Schaltführung und Schaltklinke
1. Demontieren:
Schaltführungs-Schraube
Schaltführung 1
Schaltklinke komplett 2
HINWEIS:
Schaltklinke und Schaltführung werden
gemeinsam zerlegt.
Stiftplatte
1. Demontieren:
Stiftplatten-Schraube 1
Stiftplatte 2
HINWEIS:
Die Stiftplatte bis zum Anschlag im Gegenuhr-
zeigersinn drehen und die Schraube lockern.
KONTROLLE
Kickhebelwelle und Klinkenrad
1. Kontrollieren:
Leichtgängigkeit des Klinkenrads 1
Stockend → Erneuern.
Kickhebelwelle 2
Verschlissen/beschädigt → Erneuern.
Feder 3
Gebrochen → Erneuern.
Kickstarter-Ritzel, -Zwischenrad und -Klin-
kenrad
1. Kontrollieren:
Kickstarter-Ritzel 1
Kickstarter-Zwischenrad 2
Klinkenrad 3
Verzahnung a
Klinkenverzahnung b
Verschlissen/beschädigt → Erneuern.
ARBRE DE KICK ET AXE DE SELECTEUR
KICKHEBELWELLE UND SCHALTWELLE
POINTS DE DEPOSE
Arbre de kick complet
1. Déposer:
Arbre de kick complet 1
N.B.:
Décrocher le ressort de torsion 2 de l’orifice a du
carter.
Guide de sélecteur et levier de sélecteur complet
1. Déposer:
Boulon (guide de sélecteur)
Guide de sélecteur 1
Levier de sélecteur complet 2
N.B.:
Le levier de sélecteur complet se démonte en même
temps que le guide de sélecteur.
Segment
1. Déposer:
Boulon (segment) 1
Segment 2
N.B.:
Tourner le segment dans le sens inverse des
aiguilles d’une montre jusqu’à la butée et desserrer
le boulon.
CONTROLE
Arbre de kick et roue à rochet
1. Contrôler:
Mouvement libre de la roue à rochet 1
Mouvement irrégulier → Remplacer.
Arbre de kick 2
Usure/endommagement → Remplacer.
Ressort 3
Cassé → Remplacer.
Pignon de kick, pignon fou de kick et roue à
rochet
1. Contrôler:
Pignon de kick 1
Pignon fou de kick 2
Roue à rochet 3
Dents du pignon a
Dents du rochet b
Usure/endommagement → Remplacer.

4 - 75
ENGKICK AXLE AND SHIFT SHAFT
3. Install:
Spring guide 1
NOTE:
Slide the spring guide into the kick axle, make
sure the groove a in the spring guide fits on
the stopper of the torsion spring.
4. Install:
Kick axle assembly 1
Plain washer 2
NOTE:
Apply the molybdenum disulfide grease on
the contacting surfaces of the kick axle stop-
per a and ratchet wheel guide 3.
Apply the engine oil on the kick axle.
Slide the kick axle assembly into the crank-
case and make sure the kick axle stopper fits
into the ratchet wheel guide.
5. Hook:
Torsion spring 1
NOTE:
Turn the torsion spring clockwise and hook
into the proper hole a in the crankcase.
Kick idle gear
1. Install:
Kick idle gear 1
Plain washer 2
Circlip 3
NOTE:
Install the kick idle gear with its depressed
side a toward you.
Apply the engine oil on the kick idle gear
inner circumference.
New

4 - 77
ENGCDI MAGNETO
EC4L3000
REMOVAL POINTS
EC4L3101
Rotor
1. Remove:
Nut (rotor) 1
Plain washer
Use the rotor holding tool 2.
2. Remove:
Rotor 1
Use the flywheel puller 2.
NOTE:
When installing the flywheel puller, turn it
counterclockwise.
Rotor holding tool:
YU-1235/90890-01235
Flywheel puller:
YM-1189/90890-01189
EC4L4000
INSPECTION
EC4L4101
CDI magneto
1. Inspect:
Rotor inner surface a
Stator outer surface b
Damage → Inspect the crankshaft runout
and crankshaft bearing.
If necessary, replace CDI magneto and/
or stator.
EC4L4200
Woodruff key
1. Inspect:
Woodruff key 1
Damage → Replace.

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ENGENGINE REMOVAL
Extent of removal:
1 Engine removal
Extent of removal Order Part name Q’ty Remarks
1 Engine skid plate (front) 1
2 Neutral switch 1
3 Oil hose 2
4 Chain cover 1
5 Nut (drive sprocket) 1
Refer to “REMOVAL POINTS”. 6 Lock washer 1
7 Drive sprocket 1
8Clip 1
9 Bolt (brake pedal) 1
10 Brake pedal 1
11 Engine upper bracket (right) 1
12 Engine upper bracket (left) 1
13 Engine lower bracket 2
14 Engine mounting bolt 3
15 Pivot shaft 1
Refer to “REMOVAL POINTS”.
16 Engine 1
1