2008 YAMAHA WR 250X engine

PERIODIC MAINTENANCE AND MINOR REPAIR
6-10
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NOTE:

The engine oil should be between the
minimum and maximum level marks.
4. If the engine oil is below the mini-
mum level mark, add sufficient oil
of the recommended type to raise
it to the correct level.
To change the engine oil (with or
without oil filter element replace-
ment)
1. Place the vehicle on a level sur-
face.2. Start the engine, warm it up for
several minutes, and then turn it
off.
3. Place an oil pan under the engine
to collect the used oil.
4. Remove the engine oil filler cap
and drain bolt to drain the oil from
the crankcase.
NOTE:

Check the washer for damage and re-
place it if necessary.
NOTE:

Skip steps 5–7 if the oil filter element is
not being replaced.
5. Remove the oil filter element cover
by removing the bolts.
1. Engine oil filler cap
2. Maximum level mark
3. Minimum level mark
4. Engine oil level check window
1
2
3
4

1. Engine oil drain bolt
1

1. Engine oil drain bolt
2. Washer
2
1

PERIODIC MAINTENANCE AND MINOR REPAIR
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6. Remove and replace the oil filter
element and O-rings.
NOTE:

Make sure that the O-rings are properly
seated.7. Install the oil filter element cover by
installing the bolts, then tightening
them to the specified torque.
8. Install the engine oil drain bolt, and
then tighten it to the specified
torque.
9. Add the specified amount of the
recommended engine oil, and theninstall and tighten the oil filler cap.
NOTE:

Be sure to wipe off spilled oil on any
parts after the engine and exhaust sys-
tem have cooled down.
CAUTION:

ECA11620

In order to prevent clutch slip-
page (since the engine oil also
lubricates the clutch), do not
mix any chemical additives. Do
not use oils with a diesel speci-
fication of “CD” or oils of a high-
er quality than specified. In
addition, do not use oils labeled
“ENERGY CONSERVING II” or
higher.

Make sure that no foreign mate-
rial enters the crankcase.
1. Oil filter element cover
2. Oil filter element cover bolt
1
2

1. O-ring
2. Oil filter element
Tightening torque:
Oil filter element cover bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Tightening torque:
Engine oil drain bolt:
20 Nm (2.0 m·kgf, 14.5 ft·lbf)
1
2

Recommended oil:
See page 8-1.
Oil quantity:
Without oil filter element replace-
ment:
1.30 L (1.37 US qt) (1.14 Imp.qt)
With oil filter element replacement:
1.40 L (1.48 US qt) (1.23 Imp.qt)

PERIODIC MAINTENANCE AND MINOR REPAIR
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10. Start the engine, and then let it idle
for several minutes while checking
it for oil leakage. If oil is leaking, im-
mediately turn the engine off and
check for the cause.
11. Turn the engine off, and then
check the oil level and correct it if
necessary.
CAUTION:

ECA11230
After changing the engine oil, make
sure to check the oil pressure as de-
scribed below.

Remove the bleed bolt.

Start the engine and keep it
idling until oil flows out. If no oilcomes out after one minute,
turn the engine off immediately
so it will not seize. If this occurs,
have a Yamaha dealer repair the
vehicle.

After checking the oil pressure,
tighten the bleed bolt to the
specified torque.
EAU20070
Coolant
The coolant level should be checked
before each ride. In addition, the cool-
ant must be changed at the intervals
specified in the periodic maintenance
and lubrication chart.
EAU20252
To check the coolant level
1. Place the vehicle on a level sur-
face and hold it in an upright posi-
tion.
NOTE:


The coolant level must be checked
on a cold engine since the level
varies with engine temperature.

Make sure that the vehicle is posi-
tioned straight up when checking
the coolant level. A slight tilt to the
side can result in a false reading.
2. Check the coolant level in the cool-
ant reservoir.
NOTE:

The coolant should be between the
minimum and maximum level marks.
1. “CD” specification
2. “ENERGY CONSERVING II”
1
2

1. Bleed bolt
Tightening torque:
Bleed bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)1

PERIODIC MAINTENANCE AND MINOR REPAIR
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3. If the coolant is at or below the
minimum level mark, remove pan-
el C (See page 6-6.), remove the
reservoir cap, add coolant to the
maximum level mark, and then in-
stall the reservoir cap and the pan-
el.
CAUTION:

ECA10471

If coolant is not available, use
distilled water or soft tap water
instead. Do not use hard water
or salt water since it is harmful
to the engine.

If water has been used instead
of coolant, replace it with cool-
ant as soon as possible, other-
wise the cooling system will not
be protected against frost and
corrosion.

If water has been added to thecoolant, have a Yamaha dealer
check the antifreeze content of
the coolant as soon as possible,
otherwise the effectiveness of
the coolant will be reduced.
WARNING

EWA10380
Never attempt to remove the radiator
cap when the engine is hot.
NOTE:


The radiator fan is automatically
switched on or off according to the
coolant temperature in the radia-
tor.

If the engine overheats, see page
6-41 for further instructions.
EAU45152
To change the coolant
1. Place the vehicle on a level sur-
face and let the engine cool if nec-
essary.
2. Place a container under the engine
to collect the used coolant.
3. Remove the radiator cap retaining
bolt and radiator cap.
1. Maximum level mark
2. Minimum level mark
1
2

1. Coolant reservoir cap
Coolant reservoir capacity (up to the
maximum level mark):
0.25 L (0.26 US qt) (0.22 Imp.qt)
1

PERIODIC MAINTENANCE AND MINOR REPAIR
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WARNING

EWA10380
Never attempt to remove the radiator
cap when the engine is hot.
4. Remove the coolant reservoir by
removing the bolts.5. Remove the coolant reservoir cap.
6. Drain the coolant from the coolant
reservoir by turning it upside down.
7. Install the coolant reservoir by
placing it in the original position,
and then installing the bolts.8. Remove the coolant drain bolt to
drain the cooling system.
9. After the coolant is completely
drained, thoroughly flush the cool-
ing system with clean tap water.
10. Install the coolant drain bolt, and
then tighten it to the specified
torque.
NOTE:

Check the washer for damage and re-
place it if necessary.
11. Pour the specified amount of the
1. Radiator cap
2. Radiator cap retaining bolt
2 1

1. Bolt
1. Coolant reservoir cap
1
1
1. Coolant drain bolt
Tightening torque:
Coolant drain bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
1

PERIODIC MAINTENANCE AND MINOR REPAIR
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recommended coolant into the ra-
diator and reservoir.
CAUTION:

ECA10471

If coolant is not available, use
distilled water or soft tap water
instead. Do not use hard water
or salt water since it is harmful
to the engine.

If water has been used instead
of coolant, replace it with cool-
ant as soon as possible, other-
wise the cooling system will not
be protected against frost and
corrosion.

If water has been added to thecoolant, have a Yamaha dealer
check the antifreeze content of
the coolant as soon as possible,
otherwise the effectiveness of
the coolant will be reduced.
12. Install the coolant reservoir cap.
13. Install the radiator cap.
14. Start the engine, let it idle for sev-
eral minutes, and then turn it off.
15. Remove the radiator cap to check
the coolant level in the radiator. If
necessary, add sufficient coolant
until it reaches the top of the radia-
tor, and then install the radiator
cap and its retaining bolt.
16. Check the coolant level in the res-
ervoir. If necessary, remove the
coolant reservoir cap, add coolant
to the maximum level mark, and
then install the cap.
17. Start the engine, and then check
the vehicle for coolant leakage. If
coolant is leaking, have a Yamaha
dealer check the cooling system.
EAU44321
Cleaning the air filter element
and check hose
The air filter element should be cleaned
at the intervals specified in the periodic
maintenance and lubrication chart.
Clean the air filter element more fre-
quently if you are riding in unusually
wet or dusty areas. In addition, the air
filter check hose must be frequently
checked and cleaned if necessary.
To clean the air filter element
1. Remove panel B. (See page 6-6.)
2. Open the air filter case cover by re-
moving the screw and pulling the
case cover outward as shown.
Antifreeze/water mixture ratio:
1:1
Recommended antifreeze:
High-quality ethylene glycol anti-
freeze containing corrosion inhibitors
for aluminum engines
Coolant quantity:
Radiator capacity (including all
routes):
0.90 L (0.95 US qt) (0.79 Imp.qt)
Coolant reservoir capacity (up to the
maximum level mark):
0.25 L (0.26 US qt) (0.22 Imp.qt)

1. Screw
2. Air filter case cover
2
1

PERIODIC MAINTENANCE AND MINOR REPAIR
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3. Unhook the holding clip, and then
pull the air filter element out.
4. Remove the sponge material from
the air filter element frame, clean it
with solvent, and then squeeze the
remaining solvent out.
5. Apply oil of the recommended type
to the entire surface of the sponge
material, and then squeeze the ex-
cess oil out.
NOTE:

The sponge material should be wet but
not dripping.
6. Pull the sponge material over the
air filter element frame.
7. Insert the air filter element into the
air filter case.
CAUTION:

ECA10480

Make sure that the air filter ele-
ment is properly seated in the
air filter case.

The engine should never be op-
erated without the air filter ele-
ment installed, otherwise the
piston(s) and/or cylinder(s) may
become excessively worn.
8. Place the holding clip in the origi-
nal position.
9. Close the air filter case cover, and
then install the screw.
10. Install the panel.
To clean the air filter check hose
1. Check the hose at the bottom of

1. Holding clip
2. Air filter element
1
2

1. Sponge material
2. Air filter element frame
1
2
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3
4

Recommended oil:
Yamaha foam air filter oil or other
quality foam air filter oil

PERIODIC MAINTENANCE AND MINOR REPAIR
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the air filter case for accumulated
dirt or water.
2. If dirt or water is visible, remove
the hose, clean it, and then install
it.

EAU45321
Adjusting the engine idling
speed
The engine idling speed must be
checked and, if necessary, adjusted as
follows.
NOTE:

A diagnostic tachometer is needed to
make this adjustment.
1. Attach the tachometer to the spark
plug lead.
2. Check the engine idling speed
and, if necessary, adjust it to spec-
ification by turning the idle adjust-
ing screw. To increase the engine
idling speed, turn the screw in di-
rection (a). To decrease the en-
gine idling speed, turn the screw in
direction (b).
NOTE:

If the specified idling speed cannot be
obtained as described above, have a
Yamaha dealer make the adjustment.
1. Air filter check hose
1

1. Idle adjusting screw
Engine idling speed:
1450–1650 r/min
1
(b)
(a)