2005 YAMAHA WR 250F engine

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Page 246 of 864

YAMAHA WR 250F 2005  Owners Manual 3 - 55
INSP
ADJ
EXAMPLE:
Installed pad number = 148
Rounded off value = 150
NOTE:Pads can only be selected in
0.05 mm increments.
Locate the rounded-off value
and the measured valve clear-
ance in th

Page 248 of 864

YAMAHA WR 250F 2005  Owners 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 864

YAMAHA WR 250F 2005  Owners Manual 3 - 63
INSP
ADJ
SPARK ARRESTER CLEANING 
(For USA)
WARNING
Be sure the exhaust pipe and
silencer are cool before cleaning
the spark arrester.
Do not start the engine when
cleaning the exhaust system

Page 272 of 864

YAMAHA WR 250F 2005  Owners 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 864

YAMAHA WR 250F 2005  Owners Manual 3 - 83
INSP
ADJ
3. Adjust:
Drive chain slack
DRIVE CHAIN STOPPER 
INSPECTION
1. Inspect:
Drive chain stopper 
1 
Wear indicator groove 
a has
almost disappeared 
→
Replace.
2. Replace:
Drive chai

Page 276 of 864

YAMAHA WR 250F 2005  Owners Manual 3 - 85
INSP
ADJ
EC36C000FRONT FORK INSPECTION
1. Inspect:
Front fork smooth action
Operate the front brake and
stroke the front fork.
Unsmooth action/oil leakage
→ Repair or replace.
EC36D001FRONT

Page 282 of 864

YAMAHA WR 250F 2005  Owners 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 864

YAMAHA WR 250F 2005  Owners 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.