2002 YAMAHA WR 426F lock

4 - 61
ENGCLUTCH (WR400F)
3. Bend the lock washer 1 tab.
4. Install:
Friction plate 1 [d = ø112 mm (4.41 in)]
1
Clutch plate 2
Friction plate 2 [d = ø116 mm (4.57 in)]
3
NOTE:
Install the clutch plates and friction plates
alternately on the clutch boss, starting with a
friction plate 1 and ending with a friction plate
2.
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.
6. Install:
Push rod 2 1
Push rod 1 2
NOTE:
Apply the engine oil on the push rod 1, 2.
New
7. Install:
Pressure plate 1
NOTE:
Align the much mark a on the pressure plate
with the punched mark b on the clutch boss.

ENG
4 - 70
BALANCER
BALANCER
BALANCER
Extent of removal:1 Balancer drive gear2 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 Lock 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 - 71
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.
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.

ENG
4 - 71
BALANCIER
AUSGLEICHSWELLE
COMPENSADOR
AUSBAU
Ausgleichswellen-Antriebs- und -
Abtriebsräder
1. Die Lasche der Sicherungs-
scheibe umbiegen.
2. Lockern:
Mutter (Primärantriebsrad) 1
Mutter (Ausgleichswelle) 2
HINWEIS:
Ein Stückchen Aluminium a zwi-
schen die Zähne des Ausgleichswel-
len-Antriebsrades 3 und Aus-
gleichswellen-Abtriebrades 4 legen.
Ausgleichswelle
1. Demontieren:
Ausgleichswelle 1
HINWEIS:
Beim Ausbau der Ausgleichswelle
muß sich das Ausgleichsgewicht mit-
tig a auf der Fluchtlinie zwischen
den Mittelpunkten der Nockenwellen-
und Ausgleichswellen-Enden befin-
den.
PRÜFUNG
Primär- und Ausgleichswellen-
Antriebs- und -Abtriebsräder
1. Kontrollieren:
Primärantriebsrad 1
Ausgleichswellen-Antriebs-
rad 2
Ausgleichswellen-Abtriebs-
rad 3
Verschleiß/Beschädigung →
Erneuern.
Ausgleichswelle
1. Kontrollieren:
Ausgleichswelle
Rißbildung/Beschädigung
→ Erneuern. POINTS DE DEPOSE
Pignon menant et pignon mené du
balancier
1. Redresser l’ongle de rondelle
d’arrêt.
2. Desserrer:
Ecrou (pignon menant pri-
maire) 1
Ecrou (balancier) 2
N.B.:
Placer une plaque en aluminium a entre
les dents du pignon menant 3 et le
pignon mené 4 du balancier.
Balancier
1. Déposer:
Balancier 1
N.B.:
Avant de déposer l’arbre de balancier,
aligner le centre du poids de l’arbre de
balancier a avec l’axe reliant le centre
du vilebrequin et le centre de l’arbre de
balancier.
CONTROLE
Pignon menant primaire, pignon
menant et pignon mené du balancier
1. Contrôler:
Pignon menant primaire 1
Pignon menant du balancier 2
Pignon mené du balancier 3
Usure/endommagements →
Remplacer.
Balancier
1. Contrôler:
Balancier
Craquelures/endommagement
→ Remplacer.PUNTOS DE EXTRACCIÓN
Engranaje de accionamiento del com-
pensador y engranaje impulsor del
compensador
1. Enderece la lengüeta de la aran-
dela de freno.
2. Aflojar:
Tuerca (engranaje de acciona-
miento primario) 1
Tuerca (compensador) 2
NOTA:
Coloque una plancha de aluminio a
entre el diente del engranaje de acciona-
miento del compensador 3 y el engra-
naje impulsor 4.
Compensador
1. Extraer:
Compensador 1
NOTA:
Cuando extraiga el eje del compensador,
alinee el centro del peso del eje del com-
pensador a a través de la línea conec-
tando los centros del cigüeñal y el eje del
compensador.
INSPECCIÓN
Engranaje de accionamiento prima-
rio, engranaje de accionamiento del
compensador y engranaje impulsor
del compensador
1. Inspeccionar:
Engranaje de accionamiento
primario 1
Engranaje de accionamiento
del compensador 2
Engranaje de accionamiento
del compensador 3
Desgaste/daños → Reemplazar.
Compensador
1. Inspeccionar:
Compensador
Grietas/daños → Reemplazar.

4 - 72
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 cut b in the bal-
ancer 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
Nut (primary drive gear) 4
NOTE:
Install the primary drive gear with its stepped
side b facing the engine.
Place an aluminum plate a between the
teeth of the balancer drive gear 5 and
driven gear 6.
5. Bend the lock washer tab.
T R..50 Nm (5.0 m · kg, 3.6 ft · lb)
T R..75 Nm (7.5 m · kg, 54 ft · lb)

4 - 79
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 - 83
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 stopper plate 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 stopper plate.
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

ENG
4 - 89
ENGINE REMOVAL
Extent of removal:1 Engine removal
Extent of removal Order Part name Q’ty Remarks
1 Engine skidplate 1
2 Neutral switch 1
3 Oil hose 2
4 Chain cover 1
Refer to “REMOVAL POINTS”. 5 Nut (drive sprocket) 1
6 Lock washer 1
7 Drive sprocket 1
8 Clip 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