2005 YAMAHA WR 250F engine

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Page 230 of 864

YAMAHA WR 250F 2005  Owners 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

Page 232 of 864

YAMAHA WR 250F 2005  Owners 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 234 of 864

YAMAHA WR 250F 2005  Owners Manual 3 - 43
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ADJ
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 236 of 864

YAMAHA WR 250F 2005  Owners 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 238 of 864

YAMAHA WR 250F 2005  Owners 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 240 of 864

YAMAHA WR 250F 2005  Owners Manual 3 - 49
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ENGINE IDLING SPEED 
ADJUSTMENT
1. Start the engine and thoroughly
warm it up.
2. Adjust:
Engine idling speed
Adjustment steps:
Adjust the pilot screw.
Refer to “PILOT SCREW
ADJUST

Page 242 of 864

YAMAHA WR 250F 2005  Owners Manual 3 - 51
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3. Remove:
Right radiator
Refer to “RADIATOR” section
in the CHAPTER 4.
Carburetor
Refer to “CARBURETOR”
section in the CHAPTER 4.
Spark plug 
Upper engine bracket
Cylinde

Page 244 of 864

YAMAHA WR 250F 2005  Owners 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