engine YAMAHA MAJESTY S 125 2015 Owner's Guide

PERIODIC MAINTENANCE AND ADJUSTMENT
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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
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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
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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
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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.



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SCOOTER CARE AND STORAGE
EAU37834
Matte color cautionNOTICE
ECA15193
Some models are equipped with
matte colored finished parts. Be
sure to consult a Yamaha dealer for
advice on what products to use be-
fore cleaning the vehicle. Using a
brush, harsh chemical products or
cleaning compounds when cleaning
these parts will scratch or damage
their surface. Wax also should not
be applied to any matte colored fin-ished parts.
EAU26096
CareWhile the open design of a scooter re-
veals the attractiveness of the technol-
ogy, it also makes it more vulnerable.
Rust and corrosion can develop even if
high-quality components are used. A
rusty exhaust pipe may go unnoticed
on a car, however, it detracts from the
overall appearance of a scooter. Fre-
quent and proper care does not only
comply with the terms of the warranty,
but it will also keep your scooter looking
good, extend its life and optimize its
performance.
Before cleaning1. Cover the muffler outlet with a plastic bag after the engine has
cooled down.
2. Make sure that all caps and covers as well as all el ectrical couplers
and connectors, including the
spark plug cap, are tightly in-
stalled.
3. Remove extremely stubborn dirt, like oil burnt onto the crankcase,
with a degreasing agent and a
brush, but never apply such prod- ucts onto seals, gaskets and wheel
axles. Always rinse the dirt and de-
greaser off with water.
Cleaning
NOTICE
ECA10784

Avoid using strong acidic wheel
cleaners, especially on spoked
wheels. If such products are
used on hard-to-remove dirt, do
not leave the cleaner on the af-
fected area any longer than in-
structed. Also, thoroughly rinse
the area off with water, immedi-
ately dry it, and then apply a cor-
rosion protection spray.

Improper cleaning can damage
plastic parts (such as cowlings,
panels, windshields, headlight
lenses, meter lenses, etc.) and
the mufflers. Use only a soft,
clean cloth or sponge with wa-
ter to clean plastic. However, if
the plastic parts cannot be thor-
oughly cleaned with water, di-
luted mild detergent with water
may be used. Be sure to rinse
off any detergent residue using



SCOOTER CARE AND STORAGE
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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.



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789
SPECIFICATIONS
EAU5091K
Dimensions:Overall length:2030 mm (79.9 in)
Overall width: 715 mm (28.1 in)
Overall height: 1295 mm (51.0 in)
Seat height:
795 mm (31.3 in)
Wheelbase: 1405 mm (55.3 in)
Ground clearance: 93 mm (3.66 in)
Minimum turning radius:
2100 mm (82.7 in)Weight:Curb weight:148 kg (326 lb)Engine:Engine type:Liquid cooled 4-stroke, SOHC
Cylinder arrangement: Single cylinder
Displacement:
125 cm
3
Bore × stroke:
52.0 × 58.7 mm (2.05 × 2.31 in)
Compression ratio: 11.0 : 1
Starting system:
Electric starter
Lubrication system: Wet sump
Engine oil:Type:
SAE 10W-40
Recommended engine oil grade: API service SG type or higher, JASO stan-
dard MA or MB
*Engine oil quantity: Periodic oil change:
0.95 L (1.00 US qt, 0.84 Imp.qt)Final transmission oil:Type:SAE 10W-30 type SE motor oil
Quantity:
0.20 L (0.21 US qt, 0.18 Imp.qt)Cooling system:Coolant reservoir capacity (up to the maxi-
mum level mark):0.25 L (0.26 US qt, 0.22 Imp.qt)
Radiator capacity (including all routes): 0.56 L (0.59 US qt, 0.49 Imp.qt)
Air filter:Air filter element:Oil-coated paper elementFuel:Recommended fuel:Regular unleaded gasoline
Fuel tank capacity:
7.4 L (1.96 US gal, 1.63 Imp.gal)Fuel injection:*Throttle body:ID mark:52S1 01Spark plug(s):Manufacturer/model:
NGK / CPR8EA
Spark plug gap: 0.8–0.9 mm (0.031–0.035 in)Clutch:Clutch type:
Dry, centrifugal automaticTransmission:Primary reduction ratio:1.000
Final drive:
Gear
Secondary reduction ratio: 8.787 (45 / 13 × 33 / 13)
Transmission type: V-belt automaticChassis:Frame type:Backbone
Caster angle: 26.00 °
–20 –10 0 1020 30 40 50 C
10 30 50 70 90 110
0 130 F
SAE 10W-30
SAE 15W-40SAE 20W-40SAE 20W-50
SAE 10W-40SAE 10W-50



SPECIFICATIONS
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789
Meter lighting:LED
High beam indicator light:
LED
Turn signal indicator light: LED
Coolant temperature warning light: LED
Engine trouble warning light:
LEDFuses:Main fuse:20.0 A
Signaling system fuse:
7.5 A× 2
Ignition fuse: 7.5 A
Backup fuse: 7.5 A



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CONSUMER INFORMATION
EAU53562
Identification numbersRecord the vehicle identification num-
ber, engine serial number, and the
model label information in the spaces
provided below. These identification
numbers are needed when registering
the vehicle with the authorities in your
area and when ordering spare parts
from a Yamaha dealer.
VEHICLE IDENTIFICATION NUM-
BER:
ENGINE SERIAL NUMBER:
MODEL LABEL INFORMATION:
EAU26411
Vehicle identification number
The vehicle identification number is
stamped into the frame.TIPThe vehicle identification number is
used to identify your vehicle and may
be used to register it with the licensingauthority in your area.
EAU26441
Engine serial number
The engine serial number is stamped
into the crankcase.
EAU26501
Model label
1. Vehicle identification number
1
1. Engine serial number
1. Model label
1
1



INDEXAAcceleration and deceleration....................5-2
Air filter and V-belt case air filter
elements ................................................6-15
Auxiliary light ............................................6-30BBattery......................................................6-25
Brake fluid, changing ...............................6-22
Brake fluid level, checking .......................6-21
Brake lever, front........................................3-7
Brake lever, rear ........................................3-7
Brake levers, lubricating...........................6-23
Braking .......................................................5-3CCables, checking and lubricating .............6-22
Care ...........................................................7-1
Catalytic converter ...................................3-10
Centerstand and sidestand, checking and
lubricating ..............................................6-23
Coolant.....................................................6-13
Coolant temperature warning light .............3-3DDimmer switch ...........................................3-7EEngine break-in ..........................................5-3
Engine idling speed, checking .................6-16
Engine oil .................................................6-10
Engine serial number .................................9-1
Engine trouble warning light.......................3-3FFinal transmission oil ...............................6-12
Front and rear brak e lever free play,
checking ................................................6-20
Front and rear brake pads, checking .......6-20 Front fork, checking ................................. 6-24
Front turn signal light ............................... 6-28
Fuel............................................................ 3-8
Fuel consumption, tips
for reducing........... 5-3
Fuel gauge................................................. 3-4
Fuel tank breather hose and overflow hose ........................................................ 3-9
Fuel tank cap ............................................. 3-8
Fuses, replacing ...................................... 6-27
HHandlebar switches ................................... 3-6
Headlight bulb, replacing ......................... 6-28
Helmet holder .......................................... 3-11
High beam indicator light ........................... 3-2
Horn switch ................................................ 3-7IIdentification numbers ............................... 9-1
Ignition circuit cut-off system ................... 3-15
Indicator lights and warning lights ............. 3-2KKeyhole cover ............................................ 3-2LLicense plate light bulb, replacing ........... 6-30
Luggage hook .......................................... 3-14MMain switch/steering lock........................... 3-1
Maintenance and lubrication, periodic ....... 6-5
Maintenance, emission control system...... 6-4
Matte color, caution ................................... 7-1
Model label ................................................ 9-1
Multi-function display ................................. 3-4PPanels, removing and installing ................. 6-8
Parking ...................................................... 5-4 Part locations ............................................ 2-1
Passenger footrest .................................. 3-11
Pass switch ............................................... 3-7
SSafe-riding points ...................................... 1-5
Safety information ..................................... 1-1
Seat ......................................................... 3-10
Shock absorber assembly ....................... 3-13
Sidestand ................................................ 3-14
Spark plug, checking ................................. 6-9
Specifications ............................................ 8-1
Starting off ................................................. 5-2
Starting the engine .................................... 5-1
Start switch................................................ 3-7
Steering, checking................................... 6-25
Storage...................................................... 7-4
Storage compartments ............................ 3-12TTachometer ............................................... 3-3
Tail/brake light ......................................... 6-28
Throttle grip and cable, checking and
lubricating ............................................. 6-22
Throttle grip free play, checking .............. 6-17
Tires ........................................................ 6-17
Tool kit....................................................... 6-2
Troubleshooting ...................................... 6-30
Troubleshooting charts............................ 6-32
Turn signal indicator lights ........................ 3-2
Turn signal light bulb (rear), replacing..... 6-29
Turn signal switch ..................................... 3-7VValve clearance....................................... 6-17
Vehicle identification number .................... 9-1