2002 YAMAHA WR 250F width

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Page 346 of 694

YAMAHA WR 250F 2002  Owners Manual 4 - 39
ENGVALVES AND VALVE SPRINGS
9. Lap:
Valve face
Valve seat
NOTE:
After refacing the valve seat or replacing the
valve and valve guide, the valve seat and
valve face should be lapped.
Lapping s

Page 386 of 694

YAMAHA WR 250F 2002  Owners Manual  
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

Page 390 of 694

YAMAHA WR 250F 2002  Owners Manual  
4 - 61
ENG
 
OIL FILTER ELEMENT, WATER PUMP AND RIGHT
CRANKCASE COVER 
2. Install: 
 
Bearing   
1  
 
NOTE:
 
Install the bearing by pressing its outer race 
parallel. 
Impeller shaft  
1. Install

Page 454 of 694

YAMAHA WR 250F 2002  Owners Manual 4 - 93
ENGCRANKCASE AND CRANKSHAFT
EC4N4201
Crankshaft
1. Measure:
Runout limit a 
Small end free play limit b 
Connecting rod big end side clearance
c 
Crank width d 
Out of specification → Rep
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