2019 YAMAHA NMAX 125 engine oil

Periodic maintenance an d a djustment
6-10
6 To install the spark plu
g
1. Clean the surface of the spark plug gasket and its mating sur-
face, and then wipe off any grime
from the spark plug threads.
2. Install the spark plug with the spark plug wrench, and then tight-
en it to the specified torque.
TIP
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
specified torque as soon as possible.
3. Install the spark plug cap.
TIP
Install the spark plug cap so that it is
positioned as shown in the illustration
and the spark plug lead does not con-
tact any surrounding parts.
4. Install the panels.
EAU66991
Engine oil an d oil strainer
The engine oil level should be checked
before each ride. In addition, the oil
must be changed and the oil strainer
cleaned at the intervals specified in the
periodic maintenance and lubrication
chart.
To check the en gine oil level
1. Place the vehicle on the center- stand. A slight tilt to the side can
result in a 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 engine oil filler
cap, wipe the engine oil dipstick
clean, insert it back into the oil filler
hole (without screwing it in), and
then remove it again to check the
oil level. WARNING! The muffler
an d muffler protector become
very hot d uring use. To avoi d
possi ble burns, let the muffler
an d protector cool b efore re-
moving the oil filler cap.
[EWA17810]
TIP
The engine oil should be between the
tip of the dipstick and the maximum
level mark.
Tightenin g torque:
Spark plug: 13 N·m (1.3 kgf·m, 9.4 lb·ft)
1. Spark plug cap
2. Spark plug lead
1
2
UBV3E0E0.book Page 10 Monday, September 26, 2016 3:42 PM

Periodic maintenance an d a djustment
6-11
6
4. If the engine oil is not between the
tip of the dipstick and the maxi-
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 chan ge the en gine oil an d clean
the oil strainer 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 engine oil drain bolts A and B
to drain the oil from the crankcase.
NOTICE: When removin g the
en gine oil d rain bolt B, the O-
rin g, compression sprin g, an d
oil strainer will fall out. Take
care not to lose these parts.
[ECAT1022]
4. Clean the engine oil strainer with solvent, and then check it for dam-
age and replace it if necessary.
5. Install the engine oil strainer, com- pression spring, new O-ring and
engine oil drain bolt B.
TIP
Make sure that the O-ring is properly
seated.
6. Install engine oil drain bolt A andits new gasket, and then tighten
both drain bolts to their specified
torques.
7. Refill with the specified amount of the recommended engine oil, and
then install and tighten the oil filler
cap.
1. Engine oil filler cap
2. Engine oil dipstick
3. Maximum level mark
4. Tip of the engine oil dipstick
1
2
3
4
1. Engine oil drain bolt A
2. Gasket
3. Oil strainer
4. Compression spring
5. O-ring
6. Engine oil drain bolt B
Tightenin g torque:
Engine oil drain bolt A: 20 N·m (2.0 kgf·m, 14 lb·ft)
Engine oil drain bolt B:
32 N·m (3.2 kgf·m, 23 lb·ft)
1
3
4
5
6
2
UBV3E0E0.book Page 11 Monday, September 26, 2016 3:42 PM

Periodic maintenance an d a djustment
6-12
6
TIP
Be sure to wipe off spilled oil on any
parts after the engine and exhaust sys-
tem have cooled down.
NOTICE
ECA11621
 In or der to prevent clutch slip-
pa ge (since the en gine oil also
lu bricates the clutch), do not
mix any chemical additives. Do
not use oils with a diesel speci-
fication of “CD” or oils of a hi gh-
er quality than specifie d. In
a ddition, do not use oils la bele d
“ENERGY CONSERVING II” or
hi gher.
 Make sure that no forei gn mate-
rial enters the crankcase.
8. Start the engine, and then let it idle for several minutes while checking
it for oil leakage. If oil is leaking,
immediately turn the engine off
and check for the cause.
9. Turn the engine off, and then check the oil level and correct it if
necessary.
10. Reset the oil change tripmeter and oil change indicator “OIL”. (See
page 3-6 for reset procedures.)
EAU20067
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 final transmission oil filler cap and its O-ring from the fi-
nal transmission case.
5. Remove the final transmission oil drain bolt and its gasket to drain
the oil from the final transmission
case.
Recommen ded en gine oil:
See page 8-1.
Oil quantity: 0.90 L (0.95 US qt, 0.79 Imp.qt)
1. Final transmission oil filler cap
2. O-ring
1
2
UBV3E0E0.book Page 12 Monday, September 26, 2016 3:42 PM

Periodic maintenance an d a djustment
6-13
6
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 forei gn 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
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.
EAUN1090To check the coolant level1. Place the vehicle on the center- stand.
TIP
The coolant level must be
checked on a cold engine since
the level varies with engine tem-
perature.
 Make sure that the vehicle is posi-
tioned straight up when checking
the coolant level. A slight tilt to the
side can result in a false reading.
2. Check the coolant level through
the check window.
TIP
The coolant should be between the
minimum and maximum level marks.
1. Final transmission oil drain bolt
2. Gasket
Tightening torque:
Final transmission oil drain bolt: 20 N·m (2.0 kgf·m, 14 lb·ft)
Recommen ded final transmission
oil: See page 8-1.
Oil quantity: 0.15 L (0.16 US qt, 0.13 Imp.qt)
12
1. Coolant level check window
2. Maximum level mark
3. Minimum level mark
1
2
3
UBV3E0E0.book Page 13 Monday, September 26, 2016 3:42 PM

Scooter care and stora ge
7-1
7
EAU37834
Matte color caution
NOTICE
ECA15193
Some mo dels are equipped with
matte colore d finishe d parts. Be
sure to consult a Yamaha dealer for
a d vice on what pro ducts to use be-
fore cleanin g the vehicle. Usin g a
b rush, harsh chemical prod ucts or
cleanin g compoun ds when cleanin g
these parts will scratch or damag e
their surface. Wax also shoul d not
b e applied to any matte colored fin-
ishe d parts.
EAUN1000
Care
While 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 look-
ing good, extend its life and optimize
its performance.
Before cleanin g
1. Cover the muffler outlet with a plastic bag after the engine has
cooled down.
2. Make sure that all caps and cov- ers as well as all electrical cou-
plers 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 degreaser off with water.
Cleanin g
NOTICE
ECA10784
Avoi d usin g stron g aci dic wheel
cleaners, especially on spoke d
wheels. If such pro ducts are
use d on har d-to-remove dirt, do
not leave the cleaner on the af-
fected area any lon ger than in-
UBV3E0E0.book Page 1 Monday, September 26, 2016 3:42 PM

Scooter care and stora ge
7-4
7
EAU36564
Stora ge
Short-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
scooter.
NOTICE
ECA10821
 Storin g the scooter in a poorly
ventilate d room or coverin g it
with a tarp, while it is still wet,
will allow water an d humi dity to
seep in an d cause rust.
 To prevent corrosion, avoi d
d amp cellars, sta bles ( because
of the presence of ammonia)
an d areas where stron g chemi-
cals are store d.
Lon g-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 protect 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 damag e or injury
from sparkin g, make sure to
g roun d the spark plu g elec-
tro des while turnin g the en-
g ine over.
[EWA10952]
4. Lubricate all control cables and
the pivoting points of all levers and
pedals as well as of the side-
stand/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
6-30.
UBV3E0E0.book Page 4 Monday, September 26, 2016 3:42 PM

Specifications
8-1
8
Dimensions:
Overall length:1955 mm (77.0 in)
Overall width:
740 mm (29.1 in)
Overall height: 1115 mm (43.9 in)
Seat height: 765 mm (30.1 in)
Wheelbase:
1350 mm (53.1 in)
Ground clearance: 135 mm (5.31 in)
Minimum turning radius: 2.0 m (6.56 ft)
Wei ght:
Curb weight:
127 kg (280 lb)
Engine:
Combustion cycle:
4-stroke
Cooling system:
Liquid cooled
Valve train: SOHC
Number of cylinders: Single cylinder
Displacement:
125 cm³ (GPD125-A)
155 cm³ (GPD150-A)
Bore × stroke:
52.0 × 5 8 . 7 m m (2 . 0 5 × 2.31 in) (GPD125-A)
58.0 × 5 8 . 7 m m (2 . 2 8 × 2.31 in) (GPD150-A)
Compression ratio:
10.5 : 1 (GPD150-A)
11.2 : 1 (GPD125-A)
Starting system:
Electric starter
Lubrication system: Wet sump
Engine oil:
Recommended brand:
YAMALUBE
SAE viscosity grades: 10W-40
Recommended engine oil grade: API service SG type or higher, JASO
standard MA or MB Engine oil quantity:
Oil change:
0.90 L (0.95 US qt, 0.79 Imp.qt)
Final transmission oil:
Type: Motor oil SAE 10W-30 type SE or higher or
Gear oil SAE 85W GL-3
Quantity: 0.15 L (0.16 US qt, 0.13 Imp.qt)
Coolant quantity:
Coolant reservoir (up to the maximum level
mark):
0.25 L (0.26 US qt, 0.22 Imp.qt)
Radiator (including all routes):
0.46 L (0.49 US qt, 0.40 Imp.qt)
Air filter:
Air filter element:Oil-coated paper element
Fuel:
Recommended fuel:Regular unleaded gasoline (Gasohol [E10]
acceptable)
Fuel tank capacity: 6.6 L (1.7 US gal, 1.5 Imp.gal)
Fuel reserve amount: 1.4 L (0.37 US gal, 0.31 Imp.gal)
Fuel injection:
Throttle body:ID mark:
2DS1 00
Spark plu g(s):
Manufacturer/model:
NGK/CPR8EA-9
Spark plug gap:
0.8–0.9 mm (0.031–0.035 in)
Clutch:
Clutch type:Dry, centrifugal, shoe
Drivetrain:
Primary reduction ratio:1.000
Final drive: Gear
Secondary reduction ratio:
10.208 (56/16 x 35/12)
Transmission type: V-belt automatic
Chassis:
Frame type:
Underbone
UBV3E0E0.book Page 1 Monday, September 26, 2016 3:42 PM

10-1
10
Index
A
ABS ....................................................... 3-11
ABS warning light ................................... 3-3
Acceleration and deceleration ................ 5-3
Air filter and V-belt case air filter
elements ............................................. 6-17
Auxiliary light bulb, replacing ................ 6-34
B
Battery .................................................. 6-30
Brake fluid, changing ............................ 6-26
Brake fluid level, checking .................... 6-25
Brake lever, front .................................. 3-10
Brake lever, rear.................................... 3-11
Brake levers, lubricating ....................... 6-28
Brake light ............................................. 6-35
Braking.................................................... 5-3
C
Cables, checking and lubricating ......... 6-27
Care ........................................................ 7-1
Catalytic converter ................................ 3-15
Centerstand and sidestand, checking and lubricating .................... 6-28
Coolant ................................................. 6-13
Coolant temperature warning light ......... 3-3
D
Data recording, vehicle ........................... 9-2
Diagnostic connector.............................. 9-2
Dimmer switch ........................................ 3-9
E
Engine break-in....................................... 5-4
Engine oil and oil strainer...................... 6-10
Engine serial number .............................. 9-1
Engine trouble warning light ................... 3-3
F
Final transmission oil ............................ 6-12
Front and rear brake lever free play, checking ............................................. 6-23
Front and rear brake pads, checking.... 6-24
Front fork, checking .............................. 6-29
Fuel ....................................................... 3-13
Fuel consumption, tips for reducing ....... 5-4
Fuel tank cap ........................................ 3-12
Fuel tank overflow hose ........................ 3-15
Fuses, replacing.................................... 6-32
H
Handlebar switches ................................ 3-9
Headlight............................................... 6-33
High beam indicator light........................ 3-3
Horn switch ........................................... 3-10
I
Identification numbers ............................ 9-1
Ignition circuit cut-off system............... 3-18
Indicator lights and warning lights ......... 3-3
K
Keyhole shutter ...................................... 3-2
M
Main switch/steering lock....................... 3-1
Maintenance and lubrication, periodic ... 6-4
Maintenance, emission control system.................................................. 6-3
Matte color, caution ............................... 7-1
Model label ............................................. 9-1
Multi-function meter unit ........................ 3-4
P
Panels, removing and installing.............. 6-7
Parking ................................................... 5-5
Part locations ......................................... 2-1
S
Safe-riding points ................................... 1-5
Safety information .................................. 1-1
Seat ...................................................... 3-16
Sidestand ............................................. 3-17
Spark plug, checking ............................. 6-9
Specifications ......................................... 8-1
Starting off.............................................. 5-2
Starting the engine ................................. 5-1
Start switch .......................................... 3-10
Steering, checking................................ 6-29
Storage ................................................... 7-4
Storage compartments ........................ 3-16
T
Taillight bulb, replacing ........................ 6-35
Throttle grip and cable, checking and lubricating .................... 6-27
Throttle grip free play, checking........... 6-19
Tires ...................................................... 6-20
Tool kit.................................................... 6-2
Troubleshooting ................................... 6-39
Troubleshooting charts ........................ 6-40
Turn signal indicator lights ..................... 3-3
Turn signal light bulb (front), replacing ............................................ 6-37
Turn signal light bulb (rear), replacing ............................................ 6-38
Turn signal switch .................................. 3-9
V
Valve clearance .................................... 6-20
V-belt, checking ................................... 6-26
Vehicle identification number ................. 9-1
UBV3E0E0.book Page 1 Monday, September 26, 2016 3:42 PM