stop start YAMAHA NMAX 155 2021 Owners Manual

DIC183
GPD155-A
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Read this manual carefully
before operating this vehicle.
MOTORCYCLE
OWNER’S MANUAL
Specifications
Consumer information
Motorcycle care and storage
Periodic maintenance and adjustment
For your safety – pre-operation checks
Instrument and control functions Special features
Stop and Start System Smart key system Description
Safety information
Operation and important riding points
[English (E)]
13Index
BAL-F8199-E0BAL-F8199-E0
BBD-F8199-E0

Table of contentsSafety information ............................ 1-1
Further safe-riding points ............... 1-5
Description ....................................... 2-1
Left view ......................................... 2-1
Right view ....................................... 2-2
Controls and instruments ............... 2-3
Smart key system ........................... 3-1
Smart key system ........................... 3-1
Operating range of the smart key system .................................. 3-2
Handling of the smart key and mechanical keys ......................... 3-3
Smart key ....................................... 3-4
Replacing the smart key battery..... 3-6
Main switch .................................... 3-7
Stop an d Start System ..................... 4-1
Stop and Start System ................... 4-1
Stop and Start System operation ... 4-1
Special features .............................. 5-1
CCU (Communication Control Unit) ................................ 5-1
Instrument an d control functions ... 6-1
Indicator lights and warning lights............................................ 6-1
Multi-function meter unit ................ 6-3
Handlebar switches ...................... 6-10 Front brake lever ........................... 6-11
Rear brake lever ............................ 6-11
ABS ............................................... 6-12
Traction control system ................ 6-13
Fuel tank cap ................................ 6-14
Fuel ............................................... 6-15
Fuel tank overflow hose ................ 6-17
Catalytic converter ........................ 6-17
Seat ............................................... 6-17
Helmet holders .............................. 6-18
Storage compartments ................. 6-19
Adjusting the shock absorber
assemblies ................................. 6-20
Power outlet ................................. 6-21
Sidestand ...................................... 6-22
Ignition circuit cut-off system ....... 6-22
For your safety – pre-operation
checks ............................................... 7-1
Operation an d important ri din g
points ................................................. 8-1
Engine break-in ............................... 8-1
Starting the engine .......................... 8-2
Starting off ...................................... 8-2
Acceleration and deceleration ........ 8-3
Braking ............................................ 8-3
Tips for reducing fuel consumption ................................ 8-3
Parking ........................................... 8-4 Perio
dic maintenance an d
a d justment ........................................ 9-1
Tool kit ............................................ 9-1
Periodic maintenance chart for the emission control system ....... 9-2
General maintenance and lubrication chart .......................... 9-3
Removing and installing panels ...... 9-7
Checking the spark plug................. 9-9
Canister ........................................ 9-11
Engine oil and oil strainer ............. 9-11
Why Yamalube.............................. 9-13
Final transmission oil .................... 9-13
Coolant ......................................... 9-15
Air filter and V-belt case
air filter elements ....................... 9-16
Checking the throttle grip
free play..................................... 9-19
Valve clearance............................. 9-19
Tires .............................................. 9-19
Cast wheels .................................. 9-21
Checking the front and rear brake lever free play .................. 9-21
Checking the front and rear brake pads ................................ 9-22
Checking the brake fluid level ...... 9-23
Changing the brake fluid .............. 9-24
Checking the V-belt ...................... 9-24
Checking and lubricating the
cables ........................................ 9-25UBBDE0E0.book Page 1 Wednesday, June 2, 2021 2:57 PM

Smart key system
3-8
3taken place), the main switch can be
turned while the smart key system indi-
cator light is on (approximately 4 sec-
onds).
WARNING
EWA18720
Never turn the main switch to
“OFF”, “ ”, or “OPEN” while the ve-
hicle is movin
g. Otherwise the elec-
trical systems will b e switched off,
which may result in loss of control or
an acci dent.TIPDo not push the main switch knob re-
peatedly or turn the main switch back
and forth excessively (beyond normal
use). To protect the main switch from
damage, the smart key system will
temporarily disable, and the smart key
system indicator light will flash. If this
occurs, wait until the indicator light
stops flashing, and then operate the
main switch.The main switch positions are de-
scribed below.
EAU76502
ON
All electrical circuits are supplied with
power, and the engine can be started.
To turn the vehicle power on1. Turn the smart key on and bring it
within operating range.
2. Push the main switch knob and the smart key indicator light will
come on for approximately 4 sec-
onds.
3. While the smart key system indi- cator light is on, turn the main
switch to “ON”. All of the turn sig-
nal lights will flash twice and the
vehicle power will turn on.
TIPIf the vehicle battery voltage is
low, the turn signal lights will not
flash.
 See “Emergency mode” on page
9-38 for information on turning the
vehicle power on without the
smart key.
EAU76511
OFF
All electrical systems are off.
To turn the vehicle power off1. With the smart key turned on and
within operating range, turn the
main switch to “OFF”.
1. Push.
2. Turn.1 2
1. Turn.
1
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Stop and Start System
4-1
4
EAU76825
Stop an d Start SystemThe Stop and Start System stops the
engine automatically when the vehicle
is stopped in order to prevent noise,
control exhaust emissions, and reduce
fuel consumption.
When the rider turns the throttle grip
slightly, the engine restarts automati-
cally and the vehicle starts off.NOTICE
ECA23961
When parkin g the vehicle or leavin g
the vehicle unatten ded , be sure to
turn the main switch off. If the Stop
an d Start System is left turne d on,
the battery could become dis- char
ged an d it may not be possi ble
to restart the en gine due to insuffi-
cient battery volta ge.
TIP Although the engine normally
stops at the same time as the ve-
hicle, there may be a delay when
operating the vehicle under 10
km/h, such as in heavy traffic.
 If you think the battery voltage is
low because the engine cannot be
started using the starter switch or
for some other reason, do not turn
on the Stop and Start System.
 Have a Yamaha dealer check the
battery at the intervals specified in
the periodic maintenance chart.
EAU76671
Stop an d Start System opera-
tion
EAU76687
Activatin g the Stop an d Start Sys-
tem 1. Turn the main switch on.
2. Set the Stop and Start System switch to “ ”.
1. Stop and Start System indicator light “ ”
1
ON
A
AAA
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Stop and Start System
4-2
4 3. The Stop and Start System acti-
vates and the indicator light
comes on when the following con-
ditions are met: The Stop and Start System
switch is set to “ ”.
 After the engine was warmed
up, the engine was left idling
for a certain period.
 The vehicle has traveled at a
speed of 10 km/h or higher.
4. To turn off the Stop and Start Sys- tem, set the Stop and Start Sys-
tem switch to “ ”.
TIPTo preserve battery power, the
Stop and Start System may not
activate.
 If the Stop and Start System does
not activate, have a Yamaha deal-
er check the battery.
EAU76832
Stop the en gine
The engine will stop automatically
when the following conditions are met:  The Stop and Start System switch
is set to “ ”.
 The “ ” indicator light on the
multi-function meter is on.
 The vehicle is stopped with the
throttle grip fully returned. At this time, the “ ” indicator light
starts flashing to indicate that the en-
gine is currently stopped by the Stop
and Start System.
EAU76704
Restart the en
gine
If the throttle grip is turned while the
Stop and Start System indicator light is
flashing, the engine will automatically
restart and the “ ” indicator light will
stop flashing.
1. On
A1
A
AAA
A
A
1. On
2. Flashing
A
1
2
A
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Stop and Start System
4-3
4
WARNING
EWA18731
Do not turn the throttle g rip too
much or too quickly when the Stop
an d Start System is activate d an d
the en gine is stoppe d. Otherwise,
the vehicle coul d start movin g unex-
pected ly after the en gine restarts.
TIP When the sidestand is lowered,
the Stop and Start System is de-
activated.
 If the Stop and Start System does
not operate correctly, have a
Yamaha dealer check the vehicle.
EAU76711
Precautions when usin g the Stop
an d Start System
In order to prevent accidents due to
improper operation, carefully read and
observe the following precautions.
WARNING
EWA18741
When walkin g while pushin g the ve-
hicle, be sure to turn the main switch
off. If the vehicle is pushe d while the Stop an
d Start System is left turned
on, the en gine coul d start an d the
vehicle coul d start movin g if the
throttle grip is turne d acci dentally.
WARNING
EWA18751
When placin g the vehicle on the
centerstan d, be sure to turn the
main switch off. If the vehicle is
placed on the centerstand while the
Stop an d Start System is left turned
on, the en gine coul d start an d the
vehicle coul d start movin g if the
throttle grip is turne d acci dentally.
1. Flashing
2. Off
1
2
A
OFF
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Stop and Start System
4-4
4
WARNING
EWA18771
 When leavin g the vehicle unat-
ten ded , b e sure to turn the main
switch off.
 Do not leave the Stop an d Start
System turne d on when parkin g
the vehicle. Otherwise, the en-
g ine coul d start an d the vehicle
coul d start movin g if the throttle
g rip is turne d acci dentally.
WARNING
EWA18781
Before performin g maintenance, b e
sure to turn the main switch off. If
maintenance is performed while the
Stop an d Start System is turne d on,
the en gine coul d start an d the vehi-
cle coul d start movin g if the throttle
g rip is turne d.
OFF
OFFOFF
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Instrument and control functions
6-1
6
EAU77123
In dicator lig hts and warning
lig hts
EAU88900
Turn si gnal in dicator li ghts “ ”
an d“”
Each indicator light will flash when its
corresponding turn signal lights are
flashing.
EAU88910
Hi gh beam in dicator li ght “ ”
This indicator light comes on when the
high beam of the headlight is switched
on.
EAU88712
Malfunction in dicator li ght
(MIL) “ ”
This light comes on or flashes if a prob-
lem is detected in the engine or other
vehicle control system. If this occurs,
have a Yamaha dealer check the on-
board diagnostic system. The electri-
cal circuit of the warning light can be
checked by turning the vehicle power
on. The light should come on for a few
seconds, and then go off. If the light
does not come on initially when the ve-
hicle power is turned on, or if the light
remains on, have a Yamaha dealer
check the vehicle.
NOTICE
ECA26820
If the MIL starts flashin g, re duce en-
g ine spee d to prevent exhaust sys-
tem damag e.TIPThe engine is sensitively monitored by
the on-board diagnostic system to de-
tect deterioration and malfunction of
the emission control system. Therefore
the MIL may come on or flash due to
vehicle modifications, lack of mainte-
nance, or excessive/improper use of
the vehicle. To prevent this, observe
these precautions.
 Do not attempt to modify the soft-
ware of the engine control unit.
 Do not add any electrical acces-
sories that interfere with engine
control.
 Do not use aftermarket accesso-
ries or parts such as suspension,
spark plugs, injectors, exhaust
system, etc.
 Do not change the drivetrain
specifications (chain, sprockets,
wheels, tires, etc.).
1. Left turn signal indicator light “ ”
2. Incoming notification indicator light “ ”
3. Traction control system indicator
light “ ”
4. ABS warning light “ ”
5. High beam indicator light “ ”
6. Malfunction indicator light “ ”
7. Stop and Start System indicator light “ ”
8. Smart key system indicator light “ ”
9. Incoming call indicator light “ ”
10.Right turn signal indicator light “ ”
4
110
5
6
7
8
23 9
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Instrument and control functions
6-2
6 
Do not remove or alter the O2 sen-
sor, air induction system, or ex-
haust parts (catalysts or EXUP,
etc.).
 Maintain V-belt and drive belt (if
equipped) properly.
 Maintain correct tire pressure.
 Do not operate the vehicle in an
extreme manner. For example, re-
peated or excessive opening and
closing of the throttle, racing,
burnouts, wheelies, etc.
EAU88890
ABS warnin g li ght “ ”
This warning light comes on when the
vehicle is first turned on, and goes off
after starting riding. If the warning light
comes on while riding, the anti-lock
brake system may not work correctly.
WARNING
EWA16043
If the ABS warnin g lig ht does not
turn off after reachin g 10 km/h (6
mi/h), or if the warnin g li ght comes
on while ri din g:
 Use extra caution to avoi d pos-
si ble wheel lock d uring emer-
g ency brakin g. 
Have a Yamaha dealer check
the vehicle as soon as possib le.
TIPThe ABS warning light may come on
while revving the engine with the vehi-
cle on its centerstand, but this does
not indicate a malfunction.
EAU88930
Traction control system indicator
li g ht “ ”
This indicator light will flash when trac-
tion control has engaged.
If the traction control system is turned
off, this indicator light will come on.
(See page 6-13.)TIPWhen the vehicle is turned on, the light
should come on for a few seconds and
then go off. If the light does not come
on, or if the light remains on, have a
Yamaha dealer check vehicle.
EAUN2770
Smart key system in dicator
li g ht “ ”
This indicator light communicates the
status of the smart key system. When
the smart key system is operating nor-
mally, this indicator light will be off. If
there is an error in the smart key sys-
tem, the indicator light will flash. The
indicator light will also flash when com-
munication between the vehicle and
smart key takes place and when cer-
tain smart key system operations are
carried out.
EAUN2830
Stop an d Start System in dicator
li g ht “ ”
This indicator light comes on when the
Stop and Start System activates. The
indicator light will flash when the en-
gine is automatically stopped by the
Stop and Start System.TIPEven if the Stop and Start Switch is set
to Ž, this indicator light may not
come on. (See page 4-1.)
A
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Instrument and control functions
6-5
6
EAUN2920
Clock
The clock uses a 12-hour time system.
To set the clock1. Push the “MENU” switch until the
hour digits start flashing.
2. Use the “MENU” switch to set the hours.
3. Push the “MENU” switch until the minute digits start flashing.
4. Use the “MENU” switch to set the minutes.
5. Push the “MENU” switch until the minute digits stop flashing. The
setting is confirmed.
TIPWhen CCU and smartphone is con-
nected after vehicle power on, the
clock is automatically adjusted.
EAU86860
Coolant temperature meter
This meter shows the temperature of
the coolant, and thereby the condition
of the engine. The segments come on
from “C” (cold) to “H” (hot) as the en-
gine temperature increases. If the hot
segment flashes, stop the engine as
soon as possible, and let the engine
cool. (See page 9-37.)
TIPIf a problem is detected in the electrical
circuit, all segments will flash repeat-
edly. Have a Yamaha dealer check the
vehicle.
EAU86870
VVA in dicator
This model is equipped with variable
valve actuation (VVA) for good fuel
economy and acceleration in both the
low-speed and high-speed ranges.
The VVA indicator comes on when the
variable valve actuation system has
switched to the high-speed range.
To turn the VVA indicator on or off1. Turn the vehicle off.
1. Clock
1
1. Coolant temperature meter
1
1. VVA (variable valve actuation) indicator
1
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