2003 YAMAHA WR 250F light

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Page 296 of 860

YAMAHA WR 250F 2003  Owners Manual 3 - 105
INSP
ADJ
GRAISSAGE
Pour assurer le bon fonctionnement de
tous les organes, graisser la machine lors
du montage, après le rodage et après cha-
que course.
1
Tous les câbles de commande
2
Piv

Page 298 of 860

YAMAHA WR 250F 2003  Owners Manual 3 - 107
INSP
ADJ
EC370000
ELECTRICAL
EC371001SPARK PLUG INSPECTION
1. Remove:
Spark plug
2. Inspect:
Electrode 
1 
Wear/damage 
→ Replace.
Insulator color 
2 
Normal condition is a medium
to ligh

Page 300 of 860

YAMAHA WR 250F 2003  Owners Manual 3 - 109
INSP
ADJ
2. Attach:
Timing light 
Inductive tachometer 
To the ignition coil lead
(orange lead 
1).
Timing light:
YM-33277-A/
90890-03141
Inductive tachometer:
YU-8036-B
Engine tachometer:
9

Page 302 of 860

YAMAHA WR 250F 2003  Owners Manual 3 - 111
INSP
ADJ
BATTERY INSPECTION AND 
CHARGING
WARNING
Batteries generate explosive
hydrogen gas and contain electro-
lyte which is made of poisonous
and highly caustic sulfuric acid. 
Therefore, a

Page 322 of 860

YAMAHA WR 250F 2003  Owners Manual 3 - 131
INSP
ADJ
REPLACING THE HEADLIGHT 
BULBS
1. Remove:
Headlight
Refer to “SEAT, FUEL TANK
AND SIDE COVERS” section
in the CHAPTER 4.
2. Remove:
Headlight bulb holder cover 
1 
3. Detach:
H

Page 324 of 860

YAMAHA WR 250F 2003  Owners Manual 3 - 133
INSP
ADJELECTRICAL
ADJUSTING THE HEADLIGHT 
BEAMS
1. Adjust:
Headlight beam (vertically)
Adjusting steps:
Turn the adjusting screw 
1 in
direction 
a or 
b.
Direction 
a Headlight beam is 
r

Page 326 of 860

YAMAHA WR 250F 2003  Owners Manual 4 - 1
ENGSEAT, FUEL TANK AND SIDE COVERS
EC400000
ENGINE
SEAT, FUEL TANK AND SIDE COVERS
Extent of removal:
1 Seat removal
2 Fuel tank removal
3 Side covers removal
4 Headlight removal
Extent of remov

Page 368 of 860

YAMAHA WR 250F 2003  Owners Manual 4 - 43
ENGCARBURETOR
9. Install:
Push rod 
1 
NOTE:While holding down the lever 1 
2,
insert the push rod farthest into the
carburetor.
12
10. Install:
Starter jet 
1 
Pilot jet 
2 
Spacer 
3 
Ne