engine YAMAHA WR 250F 2006 Service Manual

YAMAHA WR 250F 2006 Service Manual WR 250F 2006 YAMAHA YAMAHA https://www.carmanualsonline.info/img/51/52334/w960_52334-0.png YAMAHA WR 250F 2006 Service Manual

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YAMAHA WR 250F 2006 Service Manual 3 - 39
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ENGINE OIL LEVEL INSPECTION
1. Start the engine, warm it up for
several minutes, and then turn
off the engine and wait for five
minutes.
2. Place the machine on a level
place and hold

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YAMAHA WR 250F 2006 Service Manual 3 - 41
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(Except for USA and CDN)
CAUTION:
Do not add any chemical addi-
tives or use oils with a grade of
CD a or higher.
Do not use oils labeled
“ENERGY CONSERVING II” b
or higher. Engi

Page 250 of 900

YAMAHA WR 250F 2006 Service Manual 3 - 43
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4. Remove:
Oil tank cap 
1 
Oil filler cap 
2 
Frame oil drain bolt 
3 
Crankcase oil drain bolt 
4 
Oil filter element drain bolt 
5 
Drain the crankcase and oil
tank (frame) of

Page 252 of 900

YAMAHA WR 250F 2006 Service Manual 3 - 45
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8. Install:
Copper washer 
1 
Oil strainer (frame) 
2 
Oil hose 
3 
Bolt (oil hose) 
4 
Oil hose clamp 
5 
Lower engine bracket
9. Install:
Copper washer
Oil filter element dra

Page 254 of 900

YAMAHA WR 250F 2006 Service Manual 3 - 47
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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 256 of 900

YAMAHA WR 250F 2006 Service Manual 3 - 49
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VALVE CLEARANCE INSPECTION 
AND ADJUSTMENT
NOTE:The valve clearance should be
adjusted when the engine is cool to
the touch.
The piston must be at Top Dead
Center (T.D.C.) on compres

Page 258 of 900

YAMAHA WR 250F 2006 Service Manual 3 - 51
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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 260 of 900

YAMAHA WR 250F 2006 Service Manual 3 - 53
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6. Adjust:
Valve clearance
Adjustment steps:
Remove the camshaft (intake
and exhaust).
Refer to “CAMSHAFTS” section
in the CHAPTER 4.
Remove the valve lifters 
1 and
the pads 
2

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YAMAHA WR 250F 2006 Service Manual 3 - 55
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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

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YAMAHA WR 250F 2006 Service Manual 3 - 57
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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