2000 YAMAHA YZ426F lock

4 - 55
ENGBALANCER
ASSEMBLY AND INSTALLATION
Balancer, balancer drive gear and balancer
driven gear
1. Install:
lBalancer 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:
lBalancer 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 protrusion b on
the balancer end.
3. Install:
lStraight key 1
lBalancer drive gear 2
lPrimary drive gear 3
NOTE:
Align the punched mark a on the balancer
drive gear with the punched mark b on the
balancer driven gear.
4. Install:
lLock washer 1
lNut (balancer) 2
lNut (primary drive gear) 3
NOTE:
Place an aluminum plate 4 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 - 62
ENG

KICK AXLE AND SHIFT SHAFT
REMOVAL POINTS
EC4B3101
Kick axle assembly
1. Remove:
l
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:
l
Bolt (shift guide)
l
Shift guide
1

l
Shift lever assembly
2

NOTE:

The shift lever assembly is disassembled at
the same time as the shift guide.
EC4N3100
Segment
1. Remove:
l
Bolt (segment)
1

l
Segment
2

NOTE:

Turn the segment counterclockwise until it
stops and loosen the bolt.
EC4C4000
INSPECTION
EC4B4100
Kick axle and ratchet wheel
1. Check:
l
Ratchet wheel smooth movement
Unsmooth movement
®
Replace.
2. Inspect:
l
Kick axle
1

Wear/damage
®
Replace.
Kick gear, kick idle gear and ratchet wheel
1. Inspect:
l
Kick gear
1

l
Kick idle gear
2

l
Ratchet wheel
3

l
Gear teeth
a

Wear/damage
®
Replace.

4 - 65
ENGKICK AXLE AND SHIFT SHAFT
EC4B5302
Kick axle assembly
1. Install:
lKick gear 1
lRatchet wheel 2
NOTE:
Align the punched mark a on the ratchet
wheel with the punched mark b on the kick
axle.
2. Install:
lTorsion spring 1
To kick axle 2.
NOTE:
Make sure the stopper a of the torsion spring
fits into the hole b on the kick axle.
3. Install:
lSpring 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:
lKick axle assembly 1
lPlain washer 2
NOTE:
lApply the engine oil on the kick axle.
lSlide the kick axle assembly into the crank-
case, make sure the kick axle stopper a fit
into their home position b.
5. Hook:
lTorsion spring 1
NOTE:
Turn the torsion spring clockwise and hook
into the proper hole a in the crankcase.

4 - 68
ENGCDI MAGNETO
EC4L3000
REMOVAL POINTS
EC4L3101
Rotor
1. Remove:
lNut (rotor) 1
lPlain washer
Use the rotor holding tool 2.
2. Remove:
lRotor 1
Use the flywheel puller 2.
NOTE:
When installing the flywheel puller, turn it
counterclockwise.
EC4L4000
INSPECTION
EC4L4101
CDI magneto
1. Inspect:
lRotor inner surface a
lStator outer surface b
Damage ® Inspect the crankshaft
runout and crankshaft bearing.
If necessary, replace CDI magneto and/
or stator.
EC4L4200
Woodruff key
1. Inspect:
lWoodruff key 1
Damage ® Replace.
Rotor holding tool:
YU-01235/90890-01235
Flywheel puller:
YM-01189/90890-01189
EC4L5000
ASSEMBLY AND INSTALLATION
EC4L5181
CDI magneto
1. Install:
lStator 1
lBolt (stator) 2
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)

ENG
4 - 72
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 Engine oil hose 2
4 Chain cover 1
5 Nut (drive sprocket) 1
Refer to “REMOVAL POINTS”. 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

4 - 73
ENGENGINE REMOVAL
EC4M3000
REMOVAL POINTS
EC4F3100
Drive sprocket
1. Remove:
lNut (drive sprocket) 1
lLock washer 2
NOTE:
lStraighten the lock washer tab.
lLoosen the nut while applying the rear brake.
2. Remove:
lDrive sprocket 1
lDrive chain 2
NOTE:
Remove the drive sprocket together with the
drive chain.
EC4M3301
Engine removal
1. Remove:
lPivot shaft 1
NOTE:
If the pivot shaft is pulled all the way out, the
swingarm will come loose. If possible, insert a
shaft of similar diameter into the other side of
the swingarm to support it.
2. Remove:
lEngine 1
From right side.
NOTE:
Make sure that the couplers, hoses and cables
are disconnected.

4 - 73
ENG
DEPOSE DU MOTEUR
MOTOR DEMONTIEREN
AUSBAU
Antriebsritzel
1. Demontieren:
lMutter (Antriebsritzel) 1
lSicherungsscheibe 2
HINWEIS:
lDie Lasche der Sicherungsscheibe umbiegen.
lBeim Lockern der Mutter die Hinterradbrem-
se betätigen.
2. Demontieren:
lAntriebsritzel 1
lAntriebskette 2
HINWEIS:
Antriebsritzel und Antriebskette gleichzeitig
ausbauen.
Motor demontieren
1. Demontieren:
lSchwingenachse 1
HINWEIS:
Durch Herausziehen der Schwingenachse
wird die Schwinge gelöst. Um dies zu vermei-
den, eine Schraube gleichen Durchmessers
an der anderen Seite einstecken.
2. Demontieren:
lMotor 1
(von der rechten Seite)
HINWEIS:
Sicherstellen, daß zuvor alle Steckverbinder,
Schläuche und Seilzüge gelöst worden sind. POINTS DE DEPOSE
Pignon d’entraînement
1. Déposer:
lEcrou (pignon d’entraînement) 1
lRondelle-frein 2
N.B.:
lRedresser la languette de la rondelle-frein.
lDesserrer l’écrou tout en actionnant le frein
arrière.
2. Déposer:
lPignon d’entraînement 1
lChaîne de transmission 2
N.B.:
Déposer le pignon d’entraînement avec la chaîne de
transmission.
Dépose du moteur
1. Déposer:
lAxe de pivot 1
N.B.:
Si l’on sort complètement l’axe de pivot, le bras
oscillant va tomber. Si possible, introduire une tige
de diamètre équivalent de l’autre côté du bras pour
le soutenir.
2. Déposer:
lMoteur 1
Du côté droit.
N.B.:
Vérifier que les coupleurs, tuyaux et câbles sont
déconnectés.

4 - 75
ENGENGINE REMOVAL
2. Install:
lLock washer 1
lNut (drive sprocket) 2
NOTE:
Tighten the nut while applying the rear brake.
New
T R..75 Nm (7.5 m · kg, 54 ft · lb)
3. Bend the lock washer tab to lock the nut.
4. Install:
lChain guide
lChain cover 1
lBolt (chain cover) 2
T R..8 Nm (0.8 m · kg, 5.8 ft · lb)
5. Install:
lEngine oil hose 1
lBolt (engine oil hose) 2
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
6. Install:
lSpring 1
lPin 2
lNeutral switch 3
lBolt (neutral switch) 4
T R..4 Nm (0.4 m · kg, 2.9 ft · lb)