2005 YAMAHA WR 250F oil

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Page 714 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 5 - 133
CHASSWINGARM
2. Install:
Collar 
1 
Washer 
2 
To relay arm 
3.
NOTE:Apply the molybdenum disulfide
grease on the collars and oil seal
lips.
3. Install:
Collar 
1 
To connecting rod 
2.
NOT

Page 728 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 5 - 147
CHASREAR SHOCK ABSORBER
HANDLING NOTE
WARNING
This rear shock absorber is pro-
vided with a separate type tank
filled with high-pressure nitrogen
gas. To prevent the danger of
explosion, read

Page 730 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 5 - 149
CHASREAR SHOCK ABSORBER
EC583000REMOVAL POINTSEC583320Bearing
1. Remove:
Stopper ring 
(upper bearing) 
1 
NOTE:Press in the bearing while pressing
its outer race and remove the stop-
per rin

Page 738 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 6 - 1
–+ELECELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC600000
ELECTRICAL
EC610000
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC611000ELECTRICAL COMPONENTS
1Headlight
2Engine stop switch
3Clutch switch

Page 740 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 6 - 3
–+ELECMAP-CONTROLLED CDI UNIT
MAP-CONTROLLED CDI UNIT
A map-controlled, CDI ignition system is used in the WR250F.
The microcomputer in the CDI unit detects the engine speed and throttle posit

Page 745 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 6 - 8
–+ELECIGNITION SYSTEM
EC620000
IGNITION SYSTEM
INSPECTION STEPS
Use the following steps for checking the possibility of the malfunctioning engine being attributable to ignition system failure

Page 750 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 6 - 13
–+ELECIGNITION SYSTEM
SPARK GAP TEST
1. Disconnect the ignition coil from
spark plug.
2. Remove the ignition coil cap.
3. Connect the dynamic spark
tester 
1 (ignition checker 
2) as
shown.


Page 754 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 6 - 17
–+ELECIGNITION SYSTEM
EC626002IGNITION COIL INSPECTION
1. Remove the ignition coil cap.
2. Inspect:
Primary coil resistance
Out of specification 
→ 
Replace.
Tester (+) lead →
 Orange le