2002 YAMAHA WR 250F oil

ENG
4 - 53
EMBRAYAGE
KUPPLUNG
FRIZIONE
Reibscheiben
1. Messen:
Reibscheibenstärke
Unvorschriftsmäßig → Die
Reibscheiben im Satz
erneuern.
Die Reibscheiben an vier
Stellen messen.
Kupplungsscheiben
1. Messen:
Verzug der Kupplungsschei-
ben
Unvorschriftsmäßig →
Kupplungsscheiben im Satz
erneuern.
Eine Richtplatte 1 und eine
Fühlerlehre 2 verwenden.
Reibscheibenstärke
2,9–3,1 mm
2,7 mm
Verzugsgrenze
0,1 mm
Druckhebel
1. Kontrollieren:
Druckhebelwelle 1
Verschleiß/Beschädigung →
Erneuern.
Druckstangen
1. Kontrollieren:
Druckstange 1 1
Lager 2
Unterlegscheibe 3
Druckstange 2 4
Kugel 5
Verschleiß/Beschädigung/
Verbiegung → Erneuern. Disque de friction
1. Mesurer:
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:
Voile de disque d’embrayage
Hors spécification → Rampla-
cer tous les disques
d’embrayage.
Utiliser une plaque à surfacer
1 et une jauge d’épaisseur 2.
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)
Levier de poussée
1. Contrôler:
Arbre de levier de poussée 1
Usure/endommagement →
Ramplacer.
Tige de poussée
1. Contrôler:
Tige de poussée 1 1
Roulement 2
Rondelle 3
Tige de poussée 2 4
Bille 5
Usure/endommagement/défor-
mation → Ramplacer.Disco conduttore
1. Misurare:
Spessore del disco conduttore
Fuori specifica → Sostituire in
blocco il disco conduttore.
Misurare tutti i quattro punti.
Disco condotto
1. Misurare:
Deformazione del disco con-
dotto
Fuori specifica → Sostituire in
blocco il disco condotto.
Utilizzare un piano di riscon-
tro 1 ed uno spessimetro 2.
Spessore del disco condut-
tore:
2,9 ~ 3,1 mm
(0,114 ~ 0,122 in)
: 2,7 mm
(0,106 in)
Limite di deformazione:
0,1 mm (0,004 in)
Alberino della leva spingente
1. Ispezionare:
Alberino della leva spingente
1
Usura/danno → Sostituire.
Asta di punteria
1. Ispezionare:
Asta di punteria 1 1
Cuscinetto 2
Rondella 3
Asta di punteria 2 4
Sfera 5
Usura/danno/flessioni → Sosti-
tuire.

4 - 54
ENG

CLUTCH
EC4A5000
ASSEMBLY AND INSTALLATION
Push lever shaft
1. Install:

Push lever shaft
1


Bolt (push lever shaft)
2

NOTE:


Apply the lithium soap base grease on the oil
seal lip.

Apply the engine oil on the push lever shaft.

Fit the seat plate
3
in the groove
a
of the
push lever shaft and tighten the bolt (seat
plate).
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)

Clutch
1. Install:
Primary driven gear 1
Thrust washer 2
Clutch boss 3
NOTE:
Apply the engine oil on the primary driven gear
inner circumference.
2. Install:
Lock washer 1
Nut (clutch boss) 2
NOTE:
Use the clutch holding tool 3 to hold the clutch
boss.
ÅFor USA and CDN
ıExcept for USA and CDN
Clutch holding tool:
YM-91042/90890-04086
T R..60 Nm (6.0 m · kg, 43 ft · lb)
Å
ı

4 - 55
ENGCLUTCH
3. Bend the lock washer 1 tab.
4. Install:
Seat plate 1
Cushion spring 2
NOTE:
Install the seat plate with its chamfered por-
tion a facing the clutch boss 3.
Install the seat plate so that it is not caught
on the step b.
Install the cushion spring with the paint c
facing out.
1
2
c
3
a
b
5. Install:
Friction plate 1 1
Clutch plate 1 2
Friction plate 2 3
Clutch plate 2 4
NOTE:
Install the clutch plates and friction plates
alternately on the clutch boss, starting with a
friction plate and ending with a friction plate.
Use the friction plates 1 for the first and final
while paying attention to the difference in
surface pattern.
Apply the engine oil on the friction plates and
clutch plates.
Unlike the clutch plate 2, the clutch plate 1
has no surface gloss. Use the clutch plate 1
for the first while paying attention to the dif-
ference in surface gloss.
6. Install:
Bearing 1
Washer 2
Circlip 3
To push rod 1 4.
NOTE:
Apply the engine oil on the bearing and
washer.

4 - 56
ENG

CLUTCH
7. Install:

Push rod 2
1


Ball
2


Push rod 1
3

NOTE:

Apply the engine oil on the push rod 1, 2 and
ball.
8. Install:

Pressure plate
1

9. Install:

Clutch spring
1


Bolt (clutch spring)
2

NOTE:

Tighten the bolts in stage, using a crisscross
pattern.
T R..8 Nm (0.8 m · kg, 5.8 ft · lb)

10. Install:

Dowel pin
1


Gasket (clutch cover)
2

11. Install:

Clutch cover
1


Bolt (clutch cover)
NOTE:

Tighten the bolts in stage, using a crisscross
pattern.
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)

4 - 57
ENG

OIL FILTER ELEMENT, WATER PUMP AND RIGHT
CRANKCASE COVER
OIL FILTER ELEMENT, WATER PUMP AND RIGHT
CRANKCASE COVER
Extent of removal:
1
Oil filter element removal
2
Water pump removal
3
Right crankcase cover removal
Extent of removal Order Part name Q’ty Remarks
OIL FILTER ELEMENT, WATER
PUMP AND RIGHT CRANK-
CASE COVER 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.
Radiator hose 3 Disconnect at water pump side.
Exhaust pipe Refer to “EXHAUST PIPE AND
SILENCER” section.
Brake pedal Refer to “ENGINE REMOVAL” section.
Right engine guard
1 Oil filter element cover 1
2 Oil filter element 1
13

4 - 58
ENG

OIL FILTER ELEMENT, WATER PUMP AND RIGHT
CRANKCASE COVER
Extent of removal Order Part name Q’ty Remarks
3 Water pump housing 1
4 Oil delivery pipe 1
5 Bolt (oil hose) 1
6 Kickstarter crank 1
7 Right crankcase cover 1
8 Impeller 1
Refer to “REMOVAL POINTS”. 9 Washer 1
10 Impeller shaft 1
11 Oil seal 2
12Bearing
1
3
2

4 - 59
ENG

OIL FILTER ELEMENT, WATER PUMP AND RIGHT
CRANKCASE COVER
REMOVAL POINTS
Impeller shaft
1. Remove:

Impeller
1


Washer
2


Impeller 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:

Bearing
1

2. Remove:

Oil seal
1

INSPECTION
Oil delivery pipe
1. Inspect:

Oil delivery pipe
1

Bend/damage
→
Replace.
Clogged
→
Blow.

4 - 60
ENG

OIL FILTER ELEMENT, WATER PUMP AND RIGHT
CRANKCASE COVER
EC444200
Impeller shaft
1. Inspect:

Impeller shaft
1

Bend/wear/damage
→
Replace.
Fur deposits
→
Clean.
EC444300
Impeller shaft gear
1. Inspect:

Gear teeth
a

Wear/damage
→
Replace.
EC4H4600
Bearing
1. Inspect:

Bearing
Rotate inner race with a finger.
Rough spot/seizure → Replace.
EC444400
Oil seal
1. Inspect:
Oil seal 1
Wear/damage → Replace.
ASSEMBLY AND INSTALLATION
Oil seal
1. Install:
Oil seal 1
NOTE:
Apply the lithium soap base grease on the oil
seal lip.
Install the oil seal with its manufacture’s
marks or numbers facing the right crankcase
cover 2.