2000 YAMAHA YZ426F oil

ENG

4 - 41
CLUTCH
CLUTCH
CLUTCH
Extent of removal:
1
Push rod and push lever removal
2
Push pod 1 disassembly
3
Friction plate and clutch plate removal
4
Clutch housing removal
Extent of removal Order Part name Q’ty Remarks
CLUTCH REMOVAL
Preparation for removal Drain the engine oil. Refer to “ENGINE OIL REPLACEMENT”
section in the CHAPTER 3.
Brake pedal Refer to “ENGINE REMOVAL” section.
Clutch cable Disconnect at engine side.
1 Clutch cover 1
2 Gasket 1
3 Dowel pin 2
4 Clutch spring 6
5 Pressure plate 1
6 Push rod 1 1
7 Circlip 1
8 Plain washer 1
9 Bearing 1
10 Push rod 2 1
4
1
1
2
3

4 - 44
ENG

CLUTCH
EC484500
Friction plate
1. Measure:
l
Friction plate thickness
Out of specification
®
Replace friction
plate as a set.
Measure at all four points.
EC484600
Clutch plate
1. Measure:
l
Clutch plate warpage
Out of specification
®
Replace clutch
plate as a set.
Use a surface plate
1
and thickness
gauge
2
.
Push lever
1. Inspect:
l
Push lever
1

Wear/damage
®
Replace.
Friction plate thickness:
2.9 ~ 3.1 mm
(0.114 ~ 0.122 in)
: 2.7 mm (0.106 in)
Warp limit:
0.1 mm (0.004 in)
EC484810
Push rod
1. Inspect:
l
Push rod 1
1

l
Bearing
2

l
Plain washer
3

l
Push rod 2
4

Wear/damage/bend
®
Replace.
EC495000
ASSEMBLY AND INSTALLATION
Push lever
1. Install:
l
Push lever
1

NOTE:

Apply the engine oil on the oil seal lip and push
lever.

4 - 44
ENG
EMBRAYAGE
KUPPLUNG
Reibscheiben
1. Messen:
lReibscheibenstärke
Unvorschriftsmäßig ® Die Reibschei-
ben im Satz erneuern.
Die Reibscheiben an vier Stellen mes-
sen.
Kupplungsscheiben
1. Messen:
lVerzug der Kupplungsscheiben
Unvorschriftsmäßig ® Kupplungsschei-
ben im Satz erneuern.
Eine Richtplatte 1 und eine Fühlerleh-
re 2 verwenden.
Druckhebel
1. Kontrollieren:
lDruckhebel 1
Verschleiß/Beschädigung ® Erneuern.
Reibscheibenstärke
2,9–3,1 mm
2,7 mm
Verzugsgrenze
0,1 mm
Druckstangen
1. Kontrollieren:
lDruckstange 1 1
lLager 2
lBeilagscheibe 3
lDruckstange 2 4
Verschleiß/Beschädigung/Verbiegung
® Erneuern.
ZUSAMMENBAU UND MONTAGE
Druckhebel
1. Montieren:
lDruckhebel 1
HINWEIS:
Lithiumfett auf Dichtringlippe und Druckhebel
auftragen. Disque de friction
1. Mesurer:
lEpaisseur de disque de friction
Hors-spécification ® Changer tous les dis-
ques de friction.
Mesurer chaque disque en quatre endroits.
Disque d’embrayage
1. Mesurer:
lVoile de disque d’embrayage
Hors-spécification ® Changer tous les dis-
ques d’embrayage.
Utiliser une plaque à surfacer 1 et une
jauge d’épaisseur 2.
Levier de poussée
1. Contrôler:
lLevier de poussée 1
Usure/endommagement ® Changer.
Epaisseur de disque de friction:
2,9 à 3,1 mm (0,114 à 0,122 in)
: 2,7 mm (0,106 in)
Limite de déformation:
0,1 mm (0,004 in)
Tige de poussée
1. Contrôler:
lTige de poussée 1 1
lRoulement 2
lRondelle ordinaire 3
lTige de poussée 2 4
Usure/endommagement/déformation ®
Changer.
ASSEMBLAGE ET MONTAGE
Levier de poussée
1. Monter:
lLevier de poussée 1
N.B.:
Appliquer de la graisse à base de savon de lithium
sur le joint à lèvre et le levier de poussée.

4 - 45
ENG

CLUTCH
EC495221
Clutch
1. Install:
lLock washer 1
lNut (clutch boss) 2
NOTE:
Use the clutch holding tool 3 to hold the clutch
boss.
For USA and CDN
õExcept for USA and CDN
Clutch holding tool:
YM-91042/90890-04086
New
T R..75 Nm (7.5 m · kg, 54 ft · lb)
õ
2. Bend the lock washer 1 tab.
3. Install:
lFriction plate 1
lClutch plate 2
NOTE:
lInstall the clutch plates and friction plates
alternately on the clutch boss, starting with a
friction plate and ending with a friction plate.
lApply the engine oil on the friction plates and
clutch plates.
4. Install:
lBearing 1
lPlain washer 2
lCirclip 3
To push rod 1 4.
NOTE:
Apply the engine oil on the bearing and plain
washer.
New

4 - 46
ENGCLUTCH
5. Install:
lPush rod 2 1
lPush rod 1 2
NOTE:
Apply the engine oil on the push rod 1,2.
6. Install:
lPressure plate 1
7. Install:
lClutch spring
lBolt (clutch spring)
NOTE:
Tighten the bolts in stage, using a crisscross
pattern.
T R..8 Nm (0.8 m · kg, 5.8 ft · lb)
8. Install:
lGasket (clutch cover) 1
lDowel pin 2
New
9. Install:
lClutch cover 1
lBolt (clutch cover)
NOTE:
Tighten the bolts in stage, using a crisscross
pattern.
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)

ENG
4 - 47
OIL FILTER, WATER PUMP AND CRANKCASE COVER
(RIGHT)
OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT)
OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT)
Extent of removal:1 Oil filter removal2 Water pump removal
3 Crankcase (right) removal
Extent of removal Order Part name Q’ty Remarks
OIL FILTER, WATER PUMP
AND CRANKCASE COVER
(RIGHT) REMOVAL
Preparation for removal Drain the engine oil. Refer to “ENGINE OIL REPLACEMENT”
section in the CHAPTER 3.
Drain the coolant. Refer to “COOLANT REPLACEMENT”
section in the CHAPTER 3.
Exhaust pipe Refer to “EXHAUST PIPE AND
SILENCER” section in the CHAPTER 3.
Brake pedal Refer to “ENGINE REMOVAL” section.
Clutch cover Refer to “CLUTCH” section.
1 Oil filter cover 1
Refer to “ENGINE OIL REPLACEMENT”
section in the CHAPTER 3.
2 Oil filter 1
3 Coolant pipe 2 1
4 Water pump housing 1
5 Pin 2
6 Oil delivery pipe 1
1
23

ENG
4 - 48
OIL FILTER, WATER PUMP AND CRANKCASE COVER
(RIGHT)
Extent of removal Order Part name Q’ty Remarks
7 Oil hose 1
8 Kick crank 1
9 Crankcase cover (right) 1
10 Gasket 1
11 Dowel pin/O-ring 4/2
12 Impeller 1
Refer to “REMOVAL POINTS”. 13 Plain washer 1
14 Impeller shaft 1
15 Oil seal 1 1
16 Oil seal 2 1
17 Bearing 1
2
3

4 - 49
ENG
OIL FILTER, WATER PUMP AND CRANKCASE COVER
(RIGHT)
EC4G3000
REMOVAL POINTS
EC4G3110
Impeller shaft
1. Remove:
lImpeller 1
lPlain washer 2
lImpeller shaft 3
NOTE:
Hold the impeller shaft on its width across the
flats a with spanners, etc. and remove the
impeller.
EC4G3210
Oil seal
NOTE:
It is not necessary to disassemble the water
pump, unless there is an abnormality such as
excessive change in coolant level, discolora-
tion of coolant, or milky transmission oil.
1. Remove:
lBearing 1
2. Remove:
lOil seal 1
EC4G4000
INSPECTION
EC444200
Impeller shaft
1. Inspect:
lImpeller shaft 1
Bend/wear/damage ® Replace.
Fur deposits ® Clean.