2016 YAMAHA XENTER 125 engine

Periodic maintenance and adjustment
6-13
1
2
3
4
56
7
8
9
10
11
12 spring, O-ring and engine oil drain
bolt B.
TIPMake sure that the O-ring is properlyseated.
7. Install engine oil drain bolt A, and then tighten both drain bolts to
their specified torques.
8. Refill with the specified amount of the recommended engine oil, and
then install and tighten the oil filler
cap.NOTICE
ECA11671

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.
9. 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.
10. Turn the engine off, and then check the oil level and correct it if
necessary.
To reset the oil change indicator
and oil change tripmeter
TIPThe oil change indicator and oil change
tripmeter can be reset when "OIL
CHANGE" and "OIL TRIP" appear in
the multi-function display. (Seepage 3-3.)
EAU20067
Final transmission oilThe 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 final transmission oil filler cap and its O-ring from the fi-
nal transmission case.
Tightening torque:Engine oil drain bolt A: 20 Nm (2.0 m·kgf, 14.5 ft·lbf)
Engine oil drain bolt B:
32 Nm (3.2 m·kgf, 23.1 ft·lbf)
Recommended engine oil: See page 8-1.
Oil change quantity:
1.10 L (1.16 US qt, 0.97 Imp.qt)
U53BE1E0 13 ページ ２０１５年９月１５日　火曜日　午後１時４８分

Periodic maintenance and adjustment6-14
1
2
3
4
567
8
9
10
11
12
5. Remove the final transmission oil
drain bolt and its gasket to drain
the oil from the final transmission
case.
6. Install the final transmission oil drain bolt and its new gasket, and then tighten the bolt to the speci-
fied torque.
7. Refill with the specified amount of the recommended final transmis-
sion oil. WARNING! Make sure
that no foreign material enters
the final transmission case.
Make sure that no oil gets on the
tire or wheel.
[EWA11312]
8. Install the final tr ansmission oil fill-
er cap and its new O-ring, and then
tighten the oil filler cap.
9. Check the final transmission case for oil leakage. If oil is leaking,
check for the cause.
EAU20071
CoolantThe 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.
EAUT3693
To check the coolant level
The coolant level should be checked as
follows before each ride. In addition,
the coolant must be changed at the in-
tervals specified in the periodic mainte-
nance and lubrication chart.1. Place the vehicle on the center- stand.TIP
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. Open the seat. (See page 3-11.)
3. Check the coolant level in the cool- ant reservoir.
1. Final transmission oil filler cap
1. Final transmission oil drain bolt
1
1
Tightening torque:Final transmission oil drain bolt:20 Nm (2.0 m·kgf, 14.5 ft·lbf)
Recommended final transmission
oil: See page 8-1.
Oil quantity:
0.20 L (0.21 US qt, 0.18 Imp.qt)
U53BE1E0 14 ページ ２０１５年９月１５日　火曜日　午後１時４８分

Periodic maintenance and adjustment
6-15
1
2
3
4
56
7
8
9
10
11
12
TIPThe coolant should be between theminimum and maximum level marks.
4. If the coolant is at or below the minimum level mark, remove the
reservoir cap. (See page 3-11.)
WARNING! Remove only the
coolant reservoir cap. Never at-
tempt to remove the radiator
cap when the engine is
hot.
[EWA15162]
5. Add coolant or distilled water toraise the coolant to the maximum
level mark, and install the coolant
reservoir cap and the panel.
NOTICE: If coolant is not avail- able, 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 cool-
ant, replace it with coolant as
soon as possible, otherwise the
cooling system will not be pro-
tected against frost and corro-
sion. If water has been added to
the coolant, have a Yamaha
dealer check the antifreeze con-
tent of the coolant as soon as
possible, otherwise the effec-
tiveness of the coolant will be
reduced.
[ECA10473]
6. Close the seat.
EAU33032
Changing the coolant
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.
WARNING! Never attempt to remove
the radiator cap when the engine is
hot.
[EWA10382]
1. Maximum level mark
2. Minimum level mark
12
Coolant reservoir capacity:
0.25 L (0.26 US qt, 0.22 Imp.qt)
U53BE1E0 15 ページ ２０１５年９月１５日　火曜日　午後１時４８分

Periodic maintenance and adjustment6-16
1
2
3
4
567
8
9
10
11
12
EAUT3551
Air filter and V-belt case air
filter elementsThe air filter and V-belt case air filter el-
ements should be cleaned or replaced
at the intervals specified in the periodic
maintenance and lubrication chart.
Check both filter elements more fre-
quently if you are riding in unusually
wet or dusty areas. The air filter check
hose must be frequently checked and
cleaned if necessary.
Replacing the air filter element 1. Place the scooter on the center- stand.
2. Remove the screw cover and 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. NOTICE: Make
sure that the air filter element is
properly seated in the air filter
case. The engine should never
be operated without the air filter
element installed, otherwise the
piston(s) and/or cylinder(s) may
become excessively worn.
[ECA10482]
5. Install the air filter case cover by in- stalling the screws and the screw
cover. Cleaning the air filter check hose
1. Check the hose on the rear side of 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.
Cleaning the V-belt case air filter el-
ement 1. Remove panel B. (See page 6-9.)
2. Remove the V-belt air filter case cover by removing the bolts.
3. Pull the air filter element out, and then clean it with compressed air.
NOTICE: To avoid damaging the
air filter element, handle it gen-1. Screw cover
2. Air filter case cover
3. Air filter case drain hose
2
3
1
1. V-belt air filter case cover
1
U53BE1E0 16 ページ ２０１５年９月１５日　火曜日　午後１時４８分

Periodic maintenance and adjustment
6-17
1
2
3
4
56
7
8
9
10
11
12 tly and carefully, and do not
twist it.
[ECA10522]
4. Insert the element into the air filter
case.
5. Install the V-belt air filter case cov- er by installing the bolts.
6. Install the panel.
EAU44735
Checking the engine idling
speedCheck the engine idling speed and, if
necessary, have it corrected by a
Yamaha dealer.
EAU21386
Checking the throttle grip free
playMeasure the throttle grip free play as
shown.
Periodically check the throttle grip free
play and, if necessary, have a Yamaha
dealer adjust it.
1. V-belt case air filter element
1
Engine idling speed: 1600–1800 r/min
1. Throttle grip free playThrottle grip free play:3.0–5.0 mm (0.12–0.20 in)
1
U53BE1E0 17 ページ ２０１５年９月１５日　火曜日　午後１時４８分

Periodic maintenance and adjustment6-18
1
2
3
4
567
8
9
10
11
12
EAU21402
Valve clearanceThe 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.
EAU61710
TiresTires are the only contact between the
vehicle and the road. Safety in all con-
ditions of riding depends on a relatively
small area of road contact. Therefore, it
is essential to maintain the tires in good
condition at all times and replace them
at the appropriate time with the speci-
fied tires.
Tire air pressure
The tire air pressure should be checked
and, if necessary, adjusted before each
ride.
WARNING
EWA10504
Operation of this vehicle with im-
proper tire pressure may cause se-
vere injury or death from loss of
control.
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 approved
for this model.WARNING
EWA10512
Never overload your vehicle. Opera-
tion of an overloaded vehicle couldcause an accident.
Tire air pressure (measured on cold
tires):
Up to 90 kg (198 lb) load: Front:175 kPa (1.75 kgf/cm
2, 25 psi)
Rear: 200 kPa (2.00 kgf/cm2, 29 psi)
90 kg (198 lb) to maximum load:
Front:175 kPa (1.75 kgf/cm2, 25 psi)
Rear:
225 kPa (2.25 kgf/cm2, 33 psi)
Maximum load*: 179 kg (395 lb)
* Total weight of rider, passenger, car- go and accessories
U53BE1E0 18 ページ ２０１５年９月１５日　火曜日　午後１時４８分

Periodic maintenance and adjustment
6-33
1
2
3
4
56
7
8
9
10
11
12
EAU42706
Troubleshooting chartsStarting problems or poor engine performanceCheck the fuel level in
the fuel tank.1. Fuel
There is enough fuel.
There is no fuel.
Check the battery.
Supply fuel.
The engine does not start.
Check the battery.
Operate the electric starter.4. Compression
There is compression.
There is no compression.
The engine does not start.
Have a Yamaha dealer check the vehicle.Have a Yamaha dealer check the vehicle.
Remove the spark plug
and check the electrodes.3. Ignition
Wipe off with a dry cloth and correct the
spark plug gap, or replace the spark plug. Have a Yamaha dealer check the vehicle.
The engine does not start.
Check the compression.
Operate the electric starter.2. Battery
The engine turns over
quickly.
The engine turns over
slowly.
The battery is good.
DryWet
Operate the electric starter.
Check the battery lead connections,
and have a Yamaha dealer charge
the battery if necessary.
The engine does not start.
Check the ignition.
U53BE1E0 33 ページ ２０１５年９月１５日　火曜日　午後１時４８分

Periodic maintenance and adjustment6-34
1
2
3
4
567
8
9
10
11
12
Engine overheating
WARNING
EWAT1041

Do not remove the radiator cap when the engine and radiator are hot. Scalding hot fluid and steam may be
blown out under pressure, which could cause serious injury. Be sure to wait until the engine has cooled.

Place a thick rag, like a towel, over the radiator cap, and then slowly rotate the cap counterclockwise to the de-
tent to allow any residual pressure to escape. When the hissing sound has stopped, press down on the capwhile turning it counterclockwise, and then remove the cap.
TIPIf coolant is not available, tap water can be temporarily
used instead, provided that it is changed to the recommended coolantas soon as possible.Wait until the
engine has cooled.
Check the coolant level in the
reservoir and radiator.
The coolant level
is OK.The coolant level is low.
Check the cooling system
for leakage.
Have a Yamaha dealer checkand repair the cooling system.Add coolant. (See TIP.)
Start the engine. If the engine overheats again,
have a
Yamaha dealer check
and repair the cooling system.
There is
leakage.
There is
no leakage.
U53BE1E0 34 ページ ２０１５年９月１５日　火曜日　午後１時４８分