2004 YAMAHA WR 250F oil

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Page 468 of 864

YAMAHA WR 250F 2004  Owners Manual 4 - 143
ENGOIL 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
acr

Page 470 of 864

YAMAHA WR 250F 2004  Owners Manual 4 - 145
ENGOIL FILTER ELEMENT, WATER PUMP AND RIGHT CRANKCASE COVER
EC444300Impeller shaft gear
1. Inspect:
Gear teeth 
a 
Wear/damage 
→ Replace.
EC4H4600Bearing
1. Inspect:
Bearing
Rotate inner

Page 472 of 864

YAMAHA WR 250F 2004  Owners Manual 4 - 147
ENGOIL FILTER ELEMENT, WATER PUMP AND RIGHT CRANKCASE COVER
Impeller shaft
1. Install:
Impeller shaft 
1 
Washer 
2 
Impeller 
3 
NOTE:Take care so that the oil seal lip is
not damaged or

Page 474 of 864

YAMAHA WR 250F 2004  Owners Manual 4 - 149
ENGOIL FILTER ELEMENT, WATER PUMP AND RIGHT CRANKCASE COVER
Kickstarter crank
1. Install:
Kickstarter crank 
1 
Washer 
2 
Bolt (kickstarter crank) 
3 
NOTE:Install the kickstarter crank so

Page 476 of 864

YAMAHA WR 250F 2004  Owners Manual 4 - 151
ENGBALANCER
BALANCER
Extent of removal:
1 Balancer shaft drive gear
2 Balancer shaft
Extent of removal Order Part name Q’ty Remarks
BALANCER REMOVAL
Preparation for removal Primary driven ge

Page 482 of 864

YAMAHA WR 250F 2004  Owners Manual 4 - 157
ENGBALANCER
ASSEMBLY AND INSTALLATION
Balancer shaft, balancer shaft 
drive gear and balancer shaft 
driven gear
1. Install:
Balancer shaft 
1 
NOTE:Apply the engine oil on the bear-
ing.
W

Page 484 of 864

YAMAHA WR 250F 2004  Owners Manual 4 - 159
ENGOIL PUMP
OIL PUMP
Extent of removal:
1 Oil pump removal
2 Oil pump disassembly
Extent of removal Order Part name Q’ty Remarks
OIL PUMP REMOVAL AND 
DISASSEMBLY
Preparation for removal Pri

Page 488 of 864

YAMAHA WR 250F 2004  Owners Manual 4 - 163
ENGOIL PUMP
INSPECTION
Oil pump
1. Inspect:
Oil pump drive gear 
1 
Oil pump drive shaft 
2 
Rotor housing 
3 
Oil pump cover 
4 
Cracks/wear/damage 
→ 
Replace.1
32
4
2. Measure:
Tip c