2008 YAMAHA XCITY 125 engine
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PERIODIC MAINTENANCE AND MINOR REPAIR
6-7
6 Before installing a spark plug, the spark
plug gap should be measured with a
wire thickness gauge and, if necessary,
adjusted to specification.
Clean the surface of the spark plug
gasket and its mating surface, and then
wipe off any grime from the spark plug
threads.
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 speci-fied torque as soon as possible.
EAUM2270
Engine oil The engine oil level should be checked
before each ride. In addition, the oil
must be changed at the intervals spec-
ified 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 center-
stand.NOTE:Make sure that the scooter is posi-
tioned straight up when checking the oil
level. A slight tilt to the side can result ina false reading.
2. Start the engine, warm it up for
several minutes, and then turn it
off.
3. Wait a few minutes until the oil set-
tles, remove the oil filler cap, wipe
the dipstick clean, insert it back
into the oil filler hole (without
screwing it in), and then remove it
again to check the oil level.
1. Spark plug gapSpark plug gap:
0.8–0.9 mm (0.031–0.035 in)
Tightening torque:
Spark plug:
12.5 Nm (1.25 m·kgf, 9.0 ft·lbf)
1
ZAUM0037
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PERIODIC MAINTENANCE AND MINOR REPAIR
6-8
6
NOTE:The engine oil should be between theminimum 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.
5. Insert the dipstick into the oil filler
hole, and then tighten the oil filler
cap.
To change the engine oil (with or
without oil filter element replace-
ment)
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.
3. Remove the engine oil filler cap
and the engine oil drain bolt to
drain the oil from the crankcase.
4. Check the drain bolt washer for
damage and replace it if neces-
sary.
NOTE:Skip steps 5–9 if the oil filter element isnot being replaced.
5. Remove the oil filter element cover
by removing the bolts.
1. Engine oil filler capZAUM0701
1
1. Engine oil drain boltZAUM0702
1
1. Engine oil drain bolt
2. Washer
1. Oil filter element cover
12
ZAUM0129ZAUM0711
1
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Page 47 of 80
PERIODIC MAINTENANCE AND MINOR REPAIR
6-9
6 6. Remove the oil filter element and
O-ring.
7. Check the O-ring for damage and
replace it if necessary.
8. Install the new oil filter element and
an O-ring.
9. Install the oil filter element cover by
installing the bolts, then tightening
them to the specified torque.
NOTE:Make sure that the O-ring is properlyseated.
10. Install the washer and the engine
oil drain bolt, and then tighten the
drain bolt to the specified torque.NOTE:Make sure that the washer is properlyseated.
11. Add the specified amount of the
recommended engine oil, and then
install 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:
ECA11670
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 CONSERVING II” or
higher.
Be sure no foreign material en-ters the crankcase.
12. 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.
13. Turn the engine off, and then
check the oil level and correct it if
necessary.
14. Reset the oil change indicator.
(See page 3-5.)
1. Oil filter element
2. O-ring
3. Oil filter element coverTightening torque:
Oil filter cover bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)1
2
3
ZAUM0712
Tightening torque:
Engine oil drain bolt:
32 Nm (3.2 m·kgf, 23 ft·lbf)
Recommended engine oil:
See page 8-1.
Oil change quantity:
Without oil filter element replace-
ment:
1.40 L (1.48 US qt) (1.23 Imp.qt)
With oil filter element replacement:
1.50 L (1.59 US qt) (1.32 Imp.qt)
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PERIODIC MAINTENANCE AND MINOR REPAIR
6-10
6
EAU20061
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 transmis-
sion oil must be changed as follows at
the intervals specified in the periodic
maintenance and lubrication chart.
1. Start the engine, warm up the final
transmission oil by riding the
scooter for several minutes, and
then stop the engine.
2. Place the scooter on the center-
stand.
3. Place an oil pan under the final
transmission case to collect the
used oil.
4. Remove the oil filler cap and drain
bolt to drain the oil from the final
transmission case.5. Install the final transmission oil
drain bolt, and then tighten it to the
specified torque.6. Add the specified amount of the
recommended final transmission
oil, and then install and tighten the
oil filler cap.
WARNING
EWA11310
Make sure that no foreign mate-
rial enters the final transmission
case.
Make sure that no oil gets on thetire or wheel.
7. Check the final transmission case
for oil leakage. If oil is leaking,
check for the cause.
1. Final transmission oil filler cap
1. Final transmission oil drain boltTightening torque:
Final transmission oil drain bolt:
20 Nm (2.0 m·kgf, 14 ft·lbf)
1
ZAUM0658ZAUM0703
1
Recommended final transmission
oil:
See page 8-1.
Oil quantity:
0.21 L (0.22 US qt) (0.18 Imp.qt)
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PERIODIC MAINTENANCE AND MINOR REPAIR
6-11
6
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.
EAUM2101
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 theside can result in a false reading.
2. Check the coolant level through
the check window.
NOTE:The coolant should be between theminimum and maximum level marks.3. If the coolant is at or below the
minimum level mark, remove the
cowling A. (See page 6-5.)
4. Open the reservoir cap, and then
add coolant to the maximum level
mark.
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 the
coolant, have a Yamaha dealer
check the antifreeze content of
the coolant as soon as possible,
otherwise the effectiveness ofthe coolant will be reduced.WARNING
EWA10380
Never attempt to remove the radiatorcap when the engine is hot.
5. Close the reservoir cap, and then
install the cowling.
1. Maximum level mark
2. Minimum level mark
1. Coolant reservoir cap
1
2
ZAUM0660
1
ZAUM0661
Coolant reservoir capacity:
0.20 L (0.21 US qt) (0.18 Imp.qt)
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PERIODIC MAINTENANCE AND MINOR REPAIR
6-12
6
EAU33030
Changing the coolant
WARNING
EWA10380
Never attempt to remove the radiatorcap when the engine is hot.
The coolant must be changed at the in-
tervals specified in the periodic mainte-
nance and lubrication chart. Have a
Yamaha dealer change the coolant.
EAUM2241
Air filter and V-belt case air fil-
ter elements The air filter element should be re-
placed and the V-belt case air filter ele-
ment should be cleaned at the intervals
specified in the periodic maintenance
and lubrication chart. Service the air fil-
ter elements more frequently if you are
riding in unusually wet or dusty areas.
Replacing the air filter element
1. Place the scooter on the center-
stand.
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 in-
stalling the screws.
Cleaning the V-belt case air filter el-
ement
1. Remove the V-belt case air filter
covers by removing the screws.1. Air filter case cover
2. Screw
3. Air filter element1
2 2ZAUM0662
3
1. V-belt case air filter cover
2. Screw
2 1
ZAUM0704
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Page 51 of 80
PERIODIC MAINTENANCE AND MINOR REPAIR
6-13
6 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 cov-
ers by installing the screws.
CAUTION:
ECA10530
Make sure that each filter ele-
ment is properly seated in its
case.
The engine should never be op-
erated without the filter ele-
ments installed, otherwise the
piston(s) and/or cylinder(s) maybecome excessively worn.
EAU21382
Checking the throttle cable
free play The throttle cable free play should mea-
sure 3.0–5.0 mm (0.12–0.20 in) at the
throttle grip. Periodically check the
throttle cable free play and, if neces-
sary, have a Yamaha dealer adjust it.
1. Screw
2. V-belt case air filter cover
1. V-belt case air filter element
1
2
ZAUM0705
1
ZAUM0706
1. Throttle cable free play1ZAUM0051
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PERIODIC MAINTENANCE AND MINOR REPAIR
6-14
6
EAU21401
Valve clearance The valve clearance changes with use,
resulting in improper air-fuel mixture
and/or engine noise. To prevent this
from occurring, the valve clearance
must be adjusted by a Yamaha dealer
at the intervals specified in the periodic
maintenance and lubrication chart.
EAUM2040
Tires To maximize the performance, durabil-
ity, and safe operation of your vehicle,
note the following points regarding the
specified tires.
Tire air pressure
The tire air pressure should be checked
and, if necessary, adjusted before each
ride.
WARNING
EWA10500
The tire air pressure must be
checked and adjusted on cold
tires (i.e., when the temperature
of the tires equals the ambient
temperature).
The tire air pressure must be ad-
justed in accordance with the
riding speed and with the total
weight of rider, passenger, car-
go, and accessories approvedfor this model.WARNING
EWA11200
Because loading has an enormous
impact on the handling, braking,
performance and safety characteris-
tics of your vehicle, you should keep
the following precautions in mind.
ZAUM0053
Tire air pressure (measured on cold
tires):
0–90 kg (0–198 lb):
Front:
170 kPa (25 psi) (1.70 kgf/cm²)
Rear:
190 kPa (28 psi) (1.90 kgf/cm²)
90–185 kg (198–408 lb):
Front:
180 kPa (26 psi) (1.80 kgf/cm²)
Rear:
200 kPa (29 psi) (2.00 kgf/cm²)
Maximum load*:
185 kg (408 lb)
* Total weight of rider, passenger, car-
go and accessories
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