2007 YAMAHA WR 250F engine

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Page 252 of 912

YAMAHA WR 250F 2007  Owners Manual 3 - 41
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COOLING SYSTEM INSPECTION
1. Inspect:
Coolant level
2. Attach:
Radiator cap tester 
1 and
adapter 
2 
3. Apply the specified pressure.
NOTE:Do not apply pressure more than
specified

Page 254 of 912

YAMAHA WR 250F 2007  Owners Manual 3 - 43
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2. Adjust:
Clutch lever free play
NOTE:Make minute adjustment on the
lever side using the adjuster 
2.
After adjustment, check proper
operation of clutch lever. Clutch lever free pl

Page 256 of 912

YAMAHA WR 250F 2007  Owners Manual 3 - 45
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ADJ
THROTTLE LUBRICATION
1. Remove:
Cover (throttle cable cap) 
1 
Cover (grip cap) 
2 
Throttle grip cap 
3 
2. Apply:
Lithium soap base grease
On the throttle cable end 
a.
3. Instal

Page 258 of 912

YAMAHA WR 250F 2007  Owners Manual 3 - 47
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AIR FILTER CLEANING
NOTE:Proper air filter maintenance is the
biggest key to preventing premature
engine wear and damage.
CAUTION:
Never run the engine without the
air filter element i

Page 260 of 912

YAMAHA WR 250F 2007  Owners Manual 3 - 49
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5. Inspect:
Air filter element
Damage 
→ Replace.
6. Apply:
Foam-air-filter oil or equivalent
oil to the element
NOTE:Squeeze out the excess oil. Ele-
ment should be wet but not d

Page 262 of 912

YAMAHA WR 250F 2007  Owners Manual 3 - 51
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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 264 of 912

YAMAHA WR 250F 2007  Owners Manual 3 - 53
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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 266 of 912

YAMAHA WR 250F 2007  Owners Manual 3 - 55
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ADJ
4. Remove:
Engine guard 
1 
Bolt (oil tank) 
2 
Washer 
3 
Oil filler cap 
4 
Oil tank drain bolt 
5 
Crankcase oil drain bolt 
6 
Oil filter element drain bolt 
7 
Drain the cr