2000 YAMAHA WR 400F oil

4 - 43
ENGCYLINDER AND PISTON
2. Position:
lTop ring
l2nd ring
lOil ring
Offset the piston ring end gaps as
shown.
aTop ring end
b2nd ring end
cOil ring end (upper)
dOil ring
eOil ring end (lower)
3. Install:
lPiston 1
lPiston pin 2
lPiston pin clips 3
NOTE:
lApply engine oil onto the piston pin and pis-
ton.
lBe sure that the arrow mark a on the piston
points to the exhaust side of the engine.
lBefore installing the piston pin clip, cover the
crankcase with a clean rag to prevent the
piston pin clip from falling into the crankcase.
4. Lubricate:
lPiston
lPiston rings
lCylinder
NOTE:
Apply a liberal coating of engine oil.
Cylinder
1. Install:
lGasket 1
lCylinder 2
NOTE:
Install the cylinder with one hand while com-
pressing the piston rings with the other hand.
CAUTION:
lPass the timing chain 3 through the tim-
ing chain cavity.
lBe careful not to damage the timing chain
damper 4 during installation.
New
New

ENG
4 - 44
CLUTCH
CLUTCH
CLUTCH
Extent of removal:1 Push rod and push lever removal2 Push rod 1 disassembly
3 Friction plate and clutch plate removal4 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 5
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 - 47
ENGCLUTCH
EC484500
Friction plate
1. Measure:
lFriction plate thickness
Out of specification ® Replace friction
plate as a set.
Measure at all four points.
EC484600
Clutch plate
1. Measure:
lClutch plate warpage
Out of specification ® Replace clutch
plate as a set.
Use a surface plate 1 and thickness
gauge 2.
Push lever
1. Inspect:
lPush lever 1
Wear/damage ® Replace.
Friction plate thickness:
Friction plate 1 [ø112 mm (4.41 in)]:
2.72 ~ 2.88 mm
(0.107 ~ 0.113 in)
: 2.5 mm (0.098 in)
Friction plate 2 [ø116 mm (4.57 in)]:
2.92 ~ 3.08 mm
(0.115 ~ 0.121 in)
: 2.7 mm (0.106 in)
Warp limit:
0.05 mm (0.002 in)
EC484810
Push rod
1. Inspect:
lPush rod 1 1
lBearing 2
lPlain washer 3
lPush rod 2 4
Wear/damage/bend ® Replace.
EC495000
ASSEMBLY AND INSTALLATION
Push lever
1. Install:
lPush lever 1
NOTE:
Apply the engine oil on the oil seal lip and push
lever.

ENG

4 - 47
EMBRAYAGE
KUPPLUNG
EMBRAGUE
Reibscheiben
1. Messen:
l
Reibscheibenstärke
Unvorschriftsmäßig
®
Die
Reibscheiben im Satz
erneuern.
Die Reibscheiben an vier
Stellen messen.
Kupplungsscheiben
1. Messen:
l
Verzug der Kupplungsschei-
ben
Unvorschriftsmäßig
®
Kupplungsscheiben im Satz
erneuern.
Eine Richtplatte
1
und eine
Fühlerlehre
2
verwenden.
Druckhebel
1. Kontrollieren:
l
Druckhebel
1

Verschleiß/Beschädigung
®
Erneuern.
Reibscheibenstärke
Reibscheibe 1
[ø112 mm]
2,72–2,88 mm
2,5 mm
Reibscheibe 2
[ø116 mm]
2,92–3,08 mm
2,7 mm
Verzugsgrenze
0,05 mm
Druckstangen
1. Kontrollieren:

l
Druckstange 1
1

l
Lager
2

l
Beilagscheibe
3

l
Druckstange 2
4

Verschleiß/Beschädigung/
Verbiegung
®
Erneuern.
ZUSAMMENBAU UND MONTAGE
Druckhebel
1. Montieren:
l
Druckhebel
1

HINWEIS:

Lithiumfett auf Dichtringlippe und
Druckhebel auftragen.
Disque de friction
1. Mesurer:
l
Epaisseur de disque de friction
Hors-spécification
®
Changer
tous les disques de friction.
Mesurer chaque disque en qua-
tre endroits.
Disque d’embrayage
1. Mesurer:
l
Voile de disque d’embrayage
Hors-spécification
®
Changer
tous les disques d’embrayage.
Utiliser une plaque à surfacer
1
et une jauge d’épaisseur
2
.
Levier de poussée
1. Contrôler:
l
Levier de poussée
1
Usure/endommagement
®

Changer.
Epaisseur de disque de
friction:
Disque de friction 1
[ø112 mm (4,41 in)]:
2,72 à 2,88 mm
(0,107 à 0,113 in)
: 2,5 mm
(0,098 in)
Disque de friction 2
[ø116 mm (4,57 in)]:
2,92 à 3,08 mm
(0,115 à 0,121 in)
: 2,7 mm
(0,106 in)
Limite de déformation:
0,05 mm (0,002 in)
Tige de poussée
1. Contrôler:

l
Tige de poussée 1
1
l
Roulement
2
l
Rondelle ordinaire
3
l
Tige de poussée 2
4
Usure/endommagement/défor-
mation
®
Changer.
ASSEMBLAGE ET MONTAGE
Levier de poussée
1. Monter:
l
Levier 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.
Disco de fricción
1. Medir:
l
Espesor del disco de fricción
Fuera de especificaciones
®
Reemplazar el disco de fricción
como un juego.
Medir en los cuatro puntos.
Discos de embrague
1. Medir:
l
Alabeo de los discos de embra-
gue
Fuera de especificaciones
®
Reemplazar los discos de
embrague como un juego.
Utilice un mármol de ajustador
1
y un juego de galgas
2
.
Palanca de empuje
1. Inspeccionar:
l
Palanca de empuje
1

Desgaste/Daños
®
Reempla-
zar.
Espesor del disco de fric-
ción:
Disco de fricción 1
[ø112 mm (4,41 in)]:
2,72 ~ 2,88 mm
(0,107 ~ 0,113 in)
: 2,5 mm
(0,098 in)
Disco de fricción 2
[ø116 mm (4,57 in)]:
2,92 ~ 3,08 mm
(0,115 ~ 0,121 in)
: 2,7 mm
(0,106 in)
Límite de alabeo:
0,05 mm (0,002 in)
Varilla de empuje
1. Inspeccionar:

l
Varilla de empuje 1
1

l
Cojinete
2

l
Arandela plana
3

l
Varilla de empuje 2
4

Desgaste/Daños/Deformacio-
nes
®
Reemplazar.
MONTAJE E INSTALACIÓN
Palanca de empuje
1. Instalar:
l
Palanca de empuje
1

NOTA:

Aplique el aceite de motor en el labio del
retén de aceite y la palanca de empuje.

4 - 48
ENGCLUTCH
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 [ø112 mm (4.41 in)] 1
lClutch plate 2
lFriction plate 2 [ø116 mm (4.57 in)] 3
NOTE:
lInstall the clutch plates and friction plates
alternately on the clutch boss, starting with a
friction plate 1 and ending with a friction plate
2.
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 - 49
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
NOTE:
Align the much mark a on the pressure plate
with the punched mark b on the clutch boss.
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 - 50
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 - 51
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
17Bearing
1
2
3