engine YAMAHA WR 250F 2003 Workshop Manual

YAMAHA WR 250F 2003 Workshop Manual WR 250F 2003 YAMAHA YAMAHA https://www.carmanualsonline.info/img/51/52337/w960_52337-0.png YAMAHA WR 250F 2003 Workshop Manual

Page 248 of 860

YAMAHA WR 250F 2003 Workshop Manual 3 - 57
INSP
ADJ
ENGINE
INTAKE
EXHAUST
MEASURED 
CLEARANCEINSTALLED PAD NUMBER
120 125 130 135 140 145 150 155 160 165 170
175 180 185 190 195 200 205 210 215 220 225 230 235 240
0.00 ~ 0.04 120 125 13

Page 254 of 860

YAMAHA WR 250F 2003 Workshop Manual 3 - 63
INSP
ADJ
SPARK ARRESTER CLEANING 
(For USA)
WARNING
Be sure the exhaust pipe and
muffler are cool before cleaning
the spark arrester.
Do not start the engine when
cleaning the exhaust system.

Page 272 of 860

YAMAHA WR 250F 2003 Workshop Manual 3 - 81
INSP
ADJ
6. Install:
Chain joint 
1 
O-ring 
2 
Drive chain 
3 
NOTE:When installing the drive chain, apply
the lithium soap base grease on the
chain joint and O-rings.
7. Install:
Link pla

Page 274 of 860

YAMAHA WR 250F 2003 Workshop Manual 3 - 83
INSP
ADJ
3. Adjust:
Drive chain slack
Drive chain slack adjustment 
steps:
Loosen the axle nut 
1 and
locknuts 
2.
Adjust the drive chain slack by
turning the adjusters 
3.
To tighten → Tu

Page 276 of 860

YAMAHA WR 250F 2003 Workshop Manual 3 - 85
INSP
ADJ
EC36D001FRONT FORK OIL SEAL AND 
DUST SEAL CLEANING
1. Remove:
Protector
Dust seal 
1 
NOTE:Use a thin screw driver, and be care-
ful not to damage the inner fork tube
and dust seal.

Page 282 of 860

YAMAHA WR 250F 2003 Workshop Manual 3 - 91
INSP
ADJ
EC36K000REAR SHOCK ABSORBER 
INSPECTION
1. Inspect:
Swingarm smooth action
Abnormal noise/unsmooth
action 
→ Grease the pivoting
points or repair the pivoting
points.
Damage/oil lea

Page 292 of 860

YAMAHA WR 250F 2003 Workshop Manual 3 - 101
INSP
ADJ
2. Inspect:
Bearing free play
Exist play 
→ Replace.
EC36U013STEERING HEAD INSPECTION 
AND ADJUSTMENT
1. Elevate the front wheel by plac-
ing a suitable stand under the
engine.
2.

Page 298 of 860

YAMAHA WR 250F 2003 Workshop 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 Workshop 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 326 of 860

YAMAHA WR 250F 2003 Workshop 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