2007 YAMAHA WR 250F engine

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Page 268 of 912

YAMAHA WR 250F 2007  Owners Manual 3 - 57
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8. Install:
O-ring 
1 
Oil strainer 
2 
Oil hose
Bolt (oil hose)
Oil hose clamp
9. Install:
Copper washer
Oil filter element drain bolt
Crankcase oil drain bolt
Oil tank drain

Page 270 of 912

YAMAHA WR 250F 2007  Owners Manual 3 - 59
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OIL PRESSURE INSPECTION
1. Check:
Oil pressure
Checking steps:
Slightly loosen the oil pressure
check bolt 
1.
Start the engine and keep it
idling until oil starts to seep from
the

Page 272 of 912

YAMAHA WR 250F 2007  Owners Manual 3 - 61
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VALVE CLEARANCE INSPECTION 
AND ADJUSTMENT
NOTE:This section is intended for those
who have basic knowledge and skill
concerning the servicing of Yamaha
motorcycles (e.g., Yamaha deale

Page 274 of 912

YAMAHA WR 250F 2007  Owners Manual 3 - 63
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5. Check:
Valve clearance
Out of specification 
→ Adjust. 
Valve clearance (cold):
Intake valve:
0.10 ~ 0.15 mm 
(0.0039 ~ 0.0059 in)
Exhaust valve:
0.17 ~ 0.22 mm 
(0.0067 ~ 0.0087

Page 276 of 912

YAMAHA WR 250F 2007  Owners Manual 3 - 65
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6. Adjust:
Valve clearance
Adjustment steps:
Remove the camshaft (intake
and exhaust).
Refer to “CAMSHAFTS” section
in the CHAPTER 5.
Remove the valve lifters 
1 and
the pads 
2

Page 278 of 912

YAMAHA WR 250F 2007  Owners Manual 3 - 67
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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 280 of 912

YAMAHA WR 250F 2007  Owners Manual 3 - 69
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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 286 of 912

YAMAHA WR 250F 2007  Owners Manual 3 - 75
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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