2015 YAMAHA MAJESTY S 125 check engine

PERIODIC MAINTENANCE AND ADJUSTMENT
6-13
1
2
3
4
56
7
8
95. 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 transmission 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.
EAUT1525
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. 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 ft·lbf)
Recommended final transmission
oil: See page 8-1.
Oil quantity:
0.20 L (0.21 US qt, 0.18 Imp.qt)



PERIODIC MAINTENANCE AND ADJUSTMENT
6-14
2
3
4
567
8
9
TIPThe coolant should be between theminimum and maximum level marks.3. If the coolant is at or below the minimum level mark, remove pan-
el C and the reservoir cap. (See
page 6-8.) WARNING! Remove
only the coolant reservoir cap.
Never attempt to remove the ra-
diator cap when the engine is
hot.
[EWA15162]
4. Add coolant or distilled water to raise the coolant to the maximum
level mark, and install the coolant
reservoir cap and the panel. NO-
TICE: 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 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]
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
1. Coolant reservoir cap
1
Coolant reservoir capacity:0.25 L (0.26 US qt, 0.22 Imp.qt)



PERIODIC MAINTENANCE AND ADJUSTMENT
6-15
1
2
3
4
56
7
8
9
EAUT4180
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 then 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. 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 the V-belt air filter case cover by removing the bolts.
1. Screw cover
2. Air filter case cover
3. Air filter check hose
1. Air filter element
2
1 3
1



PERIODIC MAINTENANCE AND ADJUSTMENT
6-16
2
3
4
567
8
9
2. Pull the air filter element out, and
then clean it with compressed air.
NOTICE: To avoid damaging the
air filter element, handle it gen-
tly and carefully, and do not
twist it.
[ECA10522]
3. Insert the element into the air filter case.
4. Install the V-belt air filter case cov- er by installing the bolts.
EAU44735
Checking the engine idling
speedCheck the engine idling speed and, if
necessary, have it corrected by a
Yamaha dealer.
1. Bolt
2. V-belt air filter case cover
1. V-belt case air filter element
2
1
1
1
Engine idling speed:1600–1800 r/min



PERIODIC MAINTENANCE AND ADJUSTMENT
6-17
1
2
3
4
56
7
8
9
EAU21385
Checking the throttle grip free
playThe throttle grip free play should mea-
sure 3.0–5.0 mm (0.12–0.20 in) at the
inner edge of the throttle grip. Periodi-
cally check the throttle grip free play
and, if necessary, have a Yamaha
dealer adjust it.
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.
EAU21879
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-
1. Throttle grip free play
1



PERIODIC MAINTENANCE AND ADJUSTMENT
6-32
2
3
4
567
8
9
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.



PERIODIC MAINTENANCE AND ADJUSTMENT
6-33
1
2
3
4
56
7
8
9Engine 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 us
ed 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.



SCOOTER CARE AND STORAGE
7-4
1
2
3
4
5
67
8
9
EAU36564
StorageShort-term
Always store your scooter in a cool, dry
place and, if necessary, protect it
against dust with a porous cover. Be
sure the engine and the exhaust sys-
tem are cool before covering the scoot-
er.NOTICE
ECA10821

Storing the scooter in a poorly
ventilated room or covering it
with a tarp, while it is still wet,
will allow water and humidity to
seep in and cause rust.

To prevent corrosion, avoid
damp cellars, stables (because
of the presence of ammonia)
and areas where strong chemi-cals are stored.
Long-term
Before storing your scooter for several
months: 1. Follow all the instructions in the “Care” section of this chapter. 2. Fill up the fuel tank and add fuel
stabilizer (if available) to prevent
the fuel tank from rusting and the
fuel from deteriorating.
3. Perform the following steps to pro- tect the cylinder, piston rings, etc.
from corrosion.
a. Remove the spark plug cap and spark plug.
b. Pour a teaspoonful of engine oil into the spark plug bore.
c. Install the spark plug cap onto the spark plug, and then place
the spark plug on the cylinder
head so that the electrodes are
grounded. (This will limit spark-
ing during the next step.)
d. Turn the engine over several times with the starter. (This will
coat the cylinder wall with oil.)
e. Remove the spark plug cap from the spark plug, and then
install the spark plug and the
spark plug cap. WARNING! To
prevent damage or injury
from sparking, make sure to
ground the spark plug elec-
trodes while turning the en-
gine over.
[EWA10952]
4. Lubricate all control cables and the pivoting points of all levers and
pedals as well as of the sidestand/
centerstand.
5. Check and, if necessary, correct the tire air pressure, and then lift
the scooter so that both of its
wheels are off the ground. Alterna-
tively, turn the wheels a little every
month in order to prevent the tires
from becoming degraded in one
spot.
6. Cover the muffler outlet with a plastic bag to prevent moisture
from entering it.
7. Remove the battery and fully charge it. Store it in a cool, dry
place and charge it once a month.
Do not store the battery in an ex-
cessively cold or warm place [less
than 0 ° C (30 °F) or more than 30
° C (90 °F)]. For more information
on storing the battery, see page
6-25.TIPMake any necessary repairs beforestoring the scooter.