Yamaha Nmax 125 Manual

							
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PERIODIC MAINTENANCE AND ADJUSTMENT
Steering, checking
Wheel bearings, checking
EAU45511
Checking the steeringWorn or loose steering bearings may
cause danger. Therefore, the operation
of the steering must be checked as fol-
lows at the intervals specified in the
periodic maintenance and lubrication
chart.1. Place the vehicle on the centerstand.
WARNING! To  avoid  injury,  se-
curely support the vehicle so
there is no danger of it falling
over.
[EWA10751]
2. Hold the lower ends of the front forklegs and try to move them forward
and backward. If any free play can
be felt, have a Yamaha dealer check
or repair the steering.
6-24
EAU23290
Checking the wheel bearingsThe front and rear wheel bearings must
be checked at the intervals specified in
the periodic maintenance and lubrication
chart. If there is play in the wheel hub or
if the wheel does not turn smoothly,
have a Yamaha dealer check the wheel
bearings. 
						

							
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6-25
Battery
EAUT2691
Battery
1
1. BatteryThis model is equipped with a VRLA
(Valve Regulated Lead Acid) battery.
There is no need to check the electro-
lyte or to add distilled water. However,
the battery lead connections need to be
checked and, if necessary, tightened.
ECA10620
NOTICENever attempt to remove the battery
cell seals, as this would permanently
damage the battery.
EWA10760
WARNING
8
8 8
8
8 Electrolyte is poisonous and dan-
gerous since it contains sulfuric
acid, which causes severe burns.
Avoid any contact with skin, eyes
or clothing and always shield
your eyes when working near
batteries. In case of contact, ad-
minister the following FIRST AID.
9
9 9
9
9 EXTERNAL: Flush with
plenty of water.
9
9 9
9
9 INTERNAL: Drink large
quantities of water or milk
and immediately call a
physician.
9
9 9
9
9 EYES: Flush with water for
15 minutes and seek prompt
medical attention.
8
8 8
8
8 Batteries produce explosive hy-
drogen gas. Therefore, keep
sparks, flames, cigarettes, etc.,
away from the battery and pro-
vide sufficient ventilation when
charging it in an enclosed space.
8
8 8
8
8 KEEP THIS AND ALL BATTERIES OUT OF THE REACH OF CHIL-
DREN.
The battery is located under panel A.
Remove the panel to access the bat-
tery. (See page 6-8.)
To charge the battery
Have a Yamaha dealer charge the bat-
tery as soon as possible if it seems to
have discharged. Keep in mind that the
battery tends to discharge more quickly
if the vehicle is equipped with optional
electrical accessories.
ECA16520
NOTICETo charge a VRLA (Valve Regulated
Lead Acid) battery, a special (con-
stant-voltage) battery charger is re-
quired. Using a conventional battery
charger will damage the battery. If you
do not have access to a constant-volt-
age battery charger, have a Yamaha
dealer charge your battery. 
						

							
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-26
To store the battery1. If the vehicle will not be used for more than one month, remove the
battery, fully charge it, and then
place it in a cool, dry place.
NOTICE:
 When removing the bat-
tery, be sure the key is turned to
“OFF”, then disconnect the
negative lead before disconnect-
ing the positive lead.
[ECA16302]
2. If the battery will be stored for more than two months, check it at least
once a month and fully charge it if
necessary.
3. Fully charge the battery before in- stalling it.
4. After installing the battery, make sure that the battery leads are prop-
erly connected to the battery ter-
minals.
5. Turn the key from “ON” to “OFF” three times in three-second inter-
vals to initialize the idle speed con-
trol system.
ECA16530
NOTICEAlways keep the battery charged. Stor-
ing a discharged battery can cause
permanent battery damage.
EAUT2681
Replacing the fuses
1
1. Fuse boxThe fuse box is located beside the bat-
tery compartment under panel A. (See
page 6-8.)
If a fuse is blown, replace it as follows.1. Turn the key to “OFF” and turn off the electrical circuit in question.
Fuses, replacing 
						

							
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PERIODIC MAINTENANCE AND ADJUSTMENT
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1. Spare fuse2. Remove the blown fuse, and theninstall a new fuse of the specified
amperage.  WARNING! Do not use
a fuse of a higher amperage rat-
ing than recommended to avoid
causing extensive damage to the
electrical system and possibly a
fire.
[EWA15131]
Specified fuses: Main fuse:20 A
Ignition fuse:
10 A
Signaling system fuse: 15 A
Headlight fuse: 10 A
Fuel injection system fuse:
10 ATIP
After removing and installing the main
fuse, be sure to turn the main switch
from “ON” to “OFF” three times in three-
second intervals to initialize the idle
speed control system.3. Turn the key to “ON” and turn on
the electrical circuit in question to
check if the device operates.
4. If the fuse immediately blows again, have a Yamaha dealer check the
electrical system.
6-27
EAU34240
Replacing a headlight bulb
1
1. HeadlightThis model is equipped with quartz bulb
headlights. If a headlight bulb burns out,
have a Yamaha dealer replace it and, if
necessary, adjust the headlight beam.
Headlight bulb, replacing 
						

							
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-28
Tail/brake light
Turn signal light bulb, replacing
EAU43040
Tail/brake light
1
1. Tail/brake lightIf the tail/brake light does not come on,
have a Yamaha dealer check its electri-
cal circuit or replace the bulb.
EAU24204
Replacing a turn signal light
bulb1. Remove the turn signal light lensby removing the screw.
1
1. Turn signal light Bulb
1
1. Turn signal light Bulb2. Remove the burnt-out bulb by push-ing it in and turning it counterclock-
wise.
3. Insert a new bulb into the socket, push it in, and then turn it clock-
wise until it stops.
4. Install the lens by installing the screw. 
NOTICE:
 Do not over-
tighten the screw, otherwise the
lens may break.[ECA11191] 
						

							
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-29
Troubleshooting
EAU25861
TroubleshootingAlthough Yamaha scooters receive a
thorough inspection before shipment
from the factory, trouble may occur dur-
ing operation. Any problem in the fuel,
compression, or ignition systems, for
example, can cause poor starting and
loss of power.
The following troubleshooting chart rep-
resents a quick and easy procedure for
checking these vital systems yourself.
However, should your scooter require any
repair, take it to a Yamaha dealer, whose
skilled technicians have the necessary
tools, experience, and know-how to ser-
vice the scooter properly.
Use only genuine Yamaha replacement
parts. Imitation par ts may look like
Yamaha parts, but they are often infe-
rior, have a shorter service life and can
lead to expensive repair bills.
EWA15141
WARNING
When checking the fuel system, do
not smoke, and make sure there are
no open flames or sparks in the area,including pilot lights from water heat-
ers or furnaces. Gasoline or gasoline
vapors can ignite or explode, caus-
ing severe injury or property damage. 
						

							
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PERIODIC MAINTENANCE AND ADJUSTMENT
Troubleshooting chart
6-30
EAUT1981
Troubleshooting chart
Check the fuel level in
the fuel tank.1. Fuel
There is enough fuel.There is no fuel.
Check the compression.
Supply fuel.
The engine does not start. 
Check the compression.
Operate the electric starter.2. Compression
There is compression.
There is no compression.
Check the ignition. 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.
Have a Yamaha dealer
check the vehicle.
The engine does not start.
Check the battery.
Operate the electric starter.4. Battery
The engine turns over 
quickly.
The engine turns over 
slowly.
The battery is good.Check the battery lead connections,
and charge the battery if necessary.
DryWet
Operate the electric starter. 
						

							
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EAU25991
SCOOTER CARE AND STORAGE
7-1
EAU25991
SCOOTER CARE AND STORAGE
EAU37833
Matte color caution
ECA15192
NOTICESome models are equipped with
matte colored finished parts. Be sure
to consult a Yamaha dealer for ad-
vice on what products to use before
cleaning the vehicle.
Using a brush, harsh chemical prod-
ucts or cleaning compounds when
cleaning these parts will scratch or
damage their surface. Wax also
should not be applied to any matte
colored finished parts.
EAU26094
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 over-
all appearance of a scooter. Frequent 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 plas- tic bag after the engine has cooled
down.
2. Make sure that all caps and cov- ers as well as all electrical couplers
and connectors, including the spark
plug cap, are tightly installed.
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
degreaser off with water.
Cleaning
ECA10783
NOTICE●
● ●
●
●
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 affected
area any longer than instructed.
Also, thoroughly rinse the area
off with water, immediately dry it,
and then apply a corrosion pro-
tection 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 water
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
Matte color, caution
Care 
						

							
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SCOOTER CARE AND STORAGE
7-2
any detergent residue using
plenty of water, as it is harmful
to plastic parts.
●
● ●
●
●
Do not use any harsh chemical
products on plastic parts. Be sure
to avoid using cloths or sponges
which have been in contact with
strong or abrasive cleaning prod-
ucts, solvent or thinner, fuel
(gasoline), rust removers or in-
hibitors, brake fluid, antifreeze or
electrolyte.
●
● ●
●
●
Do not use high-pressure wash-
ers or steam-jet cleaners since
they cause water seepage and
deterioration in the following ar-
eas: seals (of wheel and
swingarm bearings, fork and
brakes), electric components
(couplers, connectors, instru-
ments, switches and lights),
breather hoses and vents.
●
● ●
●
●
For vehicles equipped with a
windshield: Do not use strong
cleaners or hard sponges as they
will cause dulling or scratching.
Some cleaning compounds for
plastic may leave scratches on the windshield. Test the product
on a small hidden part of the
windshield to make sure that it
does not leave any marks. If the
windshield is scratched, use a
quality plastic polishing com-
pound after washing.
After normal use
Remove dirt with warm water, a mild
detergent, and a soft, clean sponge, and
then rinse thoroughly with clean water.
Use a toothbrush or bottlebrush for hard-
to-reach areas. Stubborn dirt and insects
will come off more easily if the area is
covered with a wet cloth for a few min-
utes before cleaning.After riding in the rain, near the sea oron salt-sprayed roads
Since sea salt or salt sprayed on the
roads during winter are extremely corro-
sive in combination with water, carry out
the following steps after each ride in the
rain, near the sea or on salt-sprayed
roads.
TIP
Salt sprayed on roads in the winter may
remain well into spring.1. Clean the scooter with cold water
and a mild detergent after the en-
gine has cooled down. 
NOTICE:
 Do
not use warm water since it in-
creases the corrosive action of
the salt.
[ECA10791]
2. Apply a corrosion protection spray on all metal, including chrome- and
nickel-plated, surfaces to prevent
corrosion.
After cleaning 1. Dry the scooter with a chamois or an absorbing cloth.
2. Use a chrome polish to shine chrome, aluminum and stainless-
steel parts, including the exhaust
system. (Even the thermally in-
duced discoloring of stainless-steel
exhaust systems can be removed
through polishing.)
3. To prevent corrosion, it is recom- mended to apply a corrosion pro- 
						

							
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7-3
tection spray on all metal, includ-
ing chrome- and nickel-plated, sur-
faces.
4. Use spray oil as a universal cleaner to remove any remaining dirt.
5. Touch up minor paint damage caused by stones, etc.
6. Wax all painted surfaces.
7. Let the scooter dry completely be- fore storing or covering it.
EWA10942
WARNING
Contaminants on the brakes or tires
can cause loss of control.●
● ●
●
●
Make sure that there is no oil or
wax on the brakes or tires. If nec-
essary, clean the brake discs and
brake linings with a regular brake
disc cleaner or acetone, and
wash the tires with warm water
and a mild detergent.
●
● ●
●
●
Before operating the vehicle, test
its braking performance and cor-
nering behavior.
ECA10800
NOTICE●
● ●
●
●
Apply spray oil and wax spar-
ingly and make sure to wipe off
any excess.
●
● ●
●
●
Never apply oil or wax to any rub-
ber and plastic parts, but treat
them with a suitable care prod-
uct.
●
● ●
●
●
Avoid using abrasive polishing
compounds as they will wear
away the paint.
TIP●
Consult a Yamaha dealer for advice
on what products to use.
●
Washing, rainy weather or humid
climates can cause the headlight
lens to fog. Turning the headlight on
for a short period of time will help
remove the moisture from the lens.
Storage
EAU36561
StorageShort-term
Always store your scooter in a cool, dry
place and, if necessary, protect it against
dust with a porous cover.
ECA10820
NOTICE●
● ●
●
●
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 chemicals 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