2003 YAMAHA WR 250F transmission

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Page 536 of 860

YAMAHA WR 250F 2003  Notices Demploi (in French) 4 - 211
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 538 of 860

YAMAHA WR 250F 2003  Notices Demploi (in French) 4 - 213
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 540 of 860

YAMAHA WR 250F 2003  Notices Demploi (in French) 4 - 215
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 550 of 860

YAMAHA WR 250F 2003  Notices Demploi (in French) 4 - 225
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 554 of 860

YAMAHA WR 250F 2003  Notices Demploi (in French) 4 - 229
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 562 of 860

YAMAHA WR 250F 2003  Notices Demploi (in French) 4 - 237
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

Page 564 of 860

YAMAHA WR 250F 2003  Notices Demploi (in French) 4 - 239
ENGCRANKCASE AND CRANKSHAFT
6. Tighten:
Hose guide 
1 
Clutch cable holder 
2 
Bolt (crankcase) 
3 
NOTE:Tighten the crankcase tightening
bolts in stage, using a crisscross pat-
tern.
T R..

Page 566 of 860

YAMAHA WR 250F 2003  Notices Demploi (in French) 4 - 241
ENGTRANSMISSION, SHIFT CAM AND SHIFT FORK
EC4H0000
TRANSMISSION, SHIFT CAM AND SHIFT FORK
Extent of removal:
1 Shift fork, shift cam, main axle and drive axle removal
Extent of removal Order P