2004 YAMAHA WR 250F transmission

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Page 490 of 864

YAMAHA WR 250F 2004  Manuale de Empleo (in Spanish) 4 - 165
ENGOIL PUMP
ASSEMBLY AND INSTALLATION
Oil pump
1. Install:
Oil pump drive shaft 
1 
Washer 
2 
Dowel pin 
3 
Inner rotor 1 
4 
NOTE:Apply the engine oil on the oil
pump drive shaft and in

Page 537 of 864

YAMAHA WR 250F 2004  Manuale de Empleo (in Spanish) 4 - 212
ENG
Organisation de la dépose:1 Dépose du moteur
Organisation de la dépose Ordre Nom de pièce QtéRemarques
Bobine d’allumage
Déconnecter le fil du volant magnétique CA.
Fil de moteur

Page 540 of 864

YAMAHA WR 250F 2004  Manuale de Empleo (in Spanish) 4 - 215
ENGENGINE REMOVAL
EC4M3000REMOVAL POINTSEC4F3100Drive sprocket
1. Remove:
Nut (drive sprocket) 
1 
Lock washer 
2 
NOTE:Straighten the lock washer tab.
Loosen the nut while applying the
re

Page 542 of 864

YAMAHA WR 250F 2004  Manuale de Empleo (in Spanish) 4 - 217
ENGENGINE REMOVAL
EC4M5000ASSEMBLY AND INSTALLATION
Engine installation
1. Install:
Engine 
1 
Install the engine from right
side.
Pivot shaft 
2 
Engine mounting bolt 
(lower) 
3 
Lower e

Page 544 of 864

YAMAHA WR 250F 2004  Manuale de Empleo (in Spanish) 4 - 219
ENGENGINE REMOVAL
2. Install:
Lock washer 
1 
Nut (drive sprocket) 
2 
NOTE:Tighten the nut while applying the
rear brake.
T R..75 Nm (7.5 m · kg, 54 ft · lb)
New
3. Bend the lock washer t

Page 554 of 864

YAMAHA WR 250F 2004  Manuale de Empleo (in Spanish) 4 - 229
ENGCRANKCASE AND CRANKSHAFT
CRANKCASE BEARING
Extent of removal:
1 Crankcase bearing removal
Extent of removal Order Part name Q’ty Remarks
CRANKCASE BEARING REMOVAL
Preparation for removal

Page 558 of 864

YAMAHA WR 250F 2004  Manuale de Empleo (in Spanish) 4 - 233
ENGCRANKCASE AND CRANKSHAFT
REMOVAL POINTS
Crankcase
1. Separate:
Right crankcase
Left crankcase
Separation steps:
Remove the crankcase bolts 
1,
hose guide 
2 and clutch cable
holder 
3.
N

Page 566 of 864

YAMAHA WR 250F 2004  Manuale de Empleo (in Spanish) 4 - 241
ENGCRANKCASE AND CRANKSHAFT
2. Check:
Shifter operation
Transmission operation
Unsmooth operation 
→ 
Repair.
3. Install:
Oil strainer 
1 
Bolt (oil strainer) 
2 
T R..10 Nm (1.0 m · kg