2005 YAMAHA XMAX 250 check engine

EAU18712
Removing and installing
cowlings and panels
The cowlings and panels shown need
to be removed to perform some of the
maintenance jobs described in this
chapter. Refer to this section each
time a cowling or panel needs to be
removed and installed.
EAU18790
Cowling A
T
o remove the cowling
1. Screws
Cowling B
Screws
Remove the screws, and then take
the cowling off.
T
o install the cowling
Place the cowling in the original posi-
tion, and then install the screws.
EAUM1250
Panel A
T
o remove the panel
1. Open the storage compartment.
(See page 3-11.)
Screws
2. Remove the screw, and then take
the panel off.
T
o install the panel
1. Place the panel in the original
position, and then install the
screw.
2. Close the storage compartment.
EAUS1280
Checking the spark plug
The spark plug is an important engine
component, which is easy to check.
Since heat and deposits will cause any
spark plug to slowly erode, the spark
plug should be removed and checked
in accordance with the periodic main-
tenance and lubrication chart. In addi-
tion, the condition of the spark plug
can reveal the condition of the engine.
To remove the spark plug
1. Storage compartment
2. Screws
1. Open the seat. (See page 3-10.)
2. Remove the storage compart-
ment under the seat by removing
the bolts.
1
2
11
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3. Remove the spark plug cap.
4. Remove the spark plug asshown, with the spark plug
wrench included in the owner’s
tool kit.
To check the spark plug 1. Check that the porcelain insula- tor around the center electrode of the spark plug is a medium-to-
light tan (the ideal color when the
motorcycle is ridden normally).
NOTE:
If the spark plug shows a distinctly dif-
ferent color, the engine could be defec-
tive. Do not attempt to diagnose such
problems yourself. Instead, have a
Yamaha dealer check the motorcycle.
2. Check the spark plug for electro-
de erosion and excessive carbon
or other deposits, and replace it if
necessary.
To install the spark plug 1. Measure the spark plug gap with
a wire thickness gauge and, if
necessary, adjust the gap to spe-
cification.
2. Clean the surface of the spark plug gasket and its mating surfa-
ce, and then wipe off any grime
from the spark plug threads.
3. Install the spark plug with the spark plug wrench, and then
tighten it to the specified torque.
NOTE:
If a torque wrench is not available
when installing a spark plug, a good
estimate of the correct torque is 1/4 ~
1/2 turn past finger tight. However,
the spark plug should be tightened to
the specified torque as soon as pos-
sible.
4. Install the spark plug cap.
Tightening torque:Spark plug:18 Nm (1,8 m•kgf, 13,01 ft•lbf)
Spark plug gap:0,7mm (0,027in)
Specified spark plug:NGK DR8EA6
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NOTE:
Make sure the spark plug wire is fas-
tened in the clamp as shown.
5. Install the storage compartment
by installing the bolts.
6. Close the seat.
EAUM1550
Engine oil
The engine oil level should be chec-
ked before each ride. In addition, the
oil must be changed at the intervals
specified in the periodic maintenance
and lubrication chart and when the
service indicator light comes on.
To check the engine oil level
1. Place the scooter on the centers-
tand.
NOTE:
Make sure that the scooter is positio-
ned straight up when checking the oil
level. A slight tilt to the side can result
in a false reading.
2. Start the engine, warm it up for
several minutes, and then turn it
off.
1. Dipstick
2. Max-min marks
3. Oil filler cap
3. Wait a few minutes until the oil
settles, remove the oil filler cap,
wipe the dipstick clean, insert it
back into the oil filler hole (wit-
hout screwing it in), and then
remove it again to check the oil
level.
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 rai-
se it to the correct level.5. Insert the dipstick into the oil filler
hole, and then tighten the oil filler
cap.
To change the engine oil
1. Start the engine, warm it up for
several minutes, and then turn it
off.
2. Place an oil pan under the engine
to collect the used oil.
1. Oil drain bolt
3. Remove the engine oil filler cap
and the engine oil drain bolt to
drain the oil from the crankcase.
4. Check the washer for damage
and replace it if necessary.
5. Install the washer and the engine
oil drain bolt, and then tighten the
drain bolt to the specified torque.
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NOTE:
Make sure that the washer is properly
seated.
6. Add the specified amount of the
recommended engine oil, and
then install and tighten the oil
filler cap.
ECA11670
CAUTION
Do not use oils with a diesel
specification of “CD” or oils of
a higher quality than specified.
In addition, do not use oils
labeled “ENERGY CONSER-
VING II” or higher.
Be sure no foreign material
enters the crankcase.
7. Start the engine, and then let it
idle for several minutes whilechecking it for oil leakage. If oil is
leaking, immediately turn the
engine off and check for the cau-
se.
8. Reset the oil change indicator.
(See page 3-6.)
EAU20060
Final transmission oil
The final transmission case must be
checked for oil leakage before each
ride. If any leakage is found, have a
Yamaha dealer check and repair the
scooter. In addition, the final trans-
mission oil must be changed as
follows at the intervals specified in the
periodic maintenance and lubrication
chart.
1. Start the engine, warm it up by
riding the scooter for several
minutes, and then stop the engi-
ne.
2. Place the scooter on the centers-
tand.
3. Place an oil pan under the final
transmission case to collect the
used oil.
1. Oil filler cap
4. Remove the oil filler cap and
drain bolt to drain the oil from the
final transmission case.
1. Oil drain bolt
5. Install the final transmission oil
drain bolt, and then tighten it to
the specified torque.
Recommended engine oil:
See page 8-1.
Oil change quantity:
1,2 L (0,26 US qt) (1,05 Imp.qt)
Tightening torque:
Engine oil drain bolt:
20 Nm (2,0 m•kgf, 14,46 ft•lbf)
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6. Add the specified amount of the
recommended final transmission
oil, and then install and tighten
the oil filler cap.
EWA11310
s s
WARNING
Make sure that no foreign
material enters the final trans-
mission case.
Make sure that no oil gets on
the tire or wheel.
7. Check the final transmission case
for oil leakage. If oil is leaking,
check for the cause.
EAU20070
Coolant
The coolant level should be checked
before each ride. In addition, the coo-
lant must be changed at the intervals
specified in the periodic maintenance
and lubrication chart.
EAUS1270
To check the coolant level
1. Place the vehicle on a level surfa-
ce 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
positioned straight up when
checking the coolant level. A
slight tilt to the side can result in
a false reading.
1. Maximum level
2. Minimum level
2. Check the coolant level through
the check window.
NOTE:
The coolant should be between the
minimum and maximum level marks.
1. Coolant reservoir cap
1
Recommended final transmission
oil:
See page 8-1.
Oil quantity:
0,25 L (0,05 US qt) (0,21 Imp.qt)
Tightening torque:
Final transmission oil drain bolt:
22 Nm (2,2 m•kgf, 15,91 ft•lbf)
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3. If the coolant is at or below theminimum level mark, remove the
right floorboard mat by pulling it
up.
4. Open the reservoir cap, and then add coolant to the maximum
level mark.
ECA10470
CAUTION
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 coo-
lant as soon as possible, other-
wise the engine may not be
sufficiently cooled and the coo-
ling system will not be protec-
ted against frost and corrosion.
If water has been added to the
coolant, have a Yamaha dealer
check the antifreeze content of
the coolant as soon as possible,
otherwise the effectiveness of
the coolant will be reduced.
EWA10380
s s WARNING
Never attempt to remove the radia-
tor cap when the engine is hot.
5. Close the reservoir cap.
6. Place the floorboard mat in the original position and push it
downward to secure it.
EAU33030
Changing the coolantEWA10380
s s WARNING
Never attempt to remove the radia-
tor cap when the engine is hot.
The coolant must be changed at the
intervals specified in the periodic
maintenance and lubrication chart.
Have a Yamaha dealer change the
coolant.
EAUS1330
Air filter and V-belt case air
filter elements
The air filter should be replaced and
the V-belt case air filter element
should be cleaned at the intervals
specified in the periodic maintenance
and lubrication chart. Replace or cle-
an the according filter element more
frequently if you are riding in unu-
sually wet or dusty areas.
Replacing air filter element 1. Place the scooter on the centers- tand.
Screws
Coolant reservoir capacity:0,46 L (0,07 US qt) (0,24 Imp.qt)
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2. Remove the air filter case cover
by removing the screws.
3. Pull the air filter element out.
4. Insert a new air filter element into
the air filter case.
5. Install the air filter case cover by
installing the screws.Cleaning the V-belt case air filter
element
1. Screw (x3)
2. V-Belt air filter case cover
1. Remove the V-belt case air filter
cover by removing the screws.
2. Remove the air filter element, and
then blow out the dirt with com-
pressed air as shown.3. Check the air filter element for
damage and replace it if neces-
sary.
4. Install the air filter element with
the colored side facing outward.
5. Install the V-belt case air filter
cover by installing the screws.
ECA10530
CAUTION
Make sure that each filter ele-
ment is properly seated in its
case.
The engine should never be
operated without the filter ele-
ments installed, otherwise the
piston(s) and/or cylinder(s)
may become excessively worn.
EAU21300
Adjusting the carburetor
The carburetor is an important part of
the engine and requires very sophisti-
cated adjustment. Therefore, all car-
buretor adjustments should be left to
a Yamaha dealer, who has the neces-
sary professional knowledge and
experience.
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EAUS1290
Adjusting the throttle cable
free play
1. Throttle cable free play
The throttle cable free play should
measure 3 ~ 5 mm (0,11 ~ 0,19 in) at
the throttle grip. Periodically check
the throttle cable free play and, if
necessary, adjust it as follows.
NOTE:
The engine idling speed must be
correctly adjusted before checking
and adjusting the throttle cable free
play.
1. Remove cowling A (See page 6-5).2. Loosen the locknut.
3. To increase the throttle cable free
play, turn the adjusting nut in
direction (a). To decrease the
throttle cable free play, turn the
adjusting nut in direction (b).
4. Tighten the locknut.
5. Install the cowling.
EAU21401
Valve clearance
The valve clearance changes with
use, resulting in improper air-fuel mix-
ture and/or engine noise. To prevent
this from occurring, the valve clearan-
ce must be adjusted by a Yamaha
dealer at the intervals specified in the
periodic maintenance and lubrication
chart.
EAU21870
Tires
To maximize the performance, durabi-
lity, and safe operation of your
motorcycle, note the following points
regarding the specified tires.
Tire air pressure
The tire air pressure should be chec-
ked and, if necessary, adjusted befo-
re each ride.
(a)
(b)
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