2021 YAMAHA XMAX 125 check engine

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 ....................................... 3-5
Replacing the smart key battery..... 3-6
Main switch .................................... 3-8
Stop an d Start System ..................... 4-1
Stop and Start System ................... 4-1
Stop and Start System operation ... 4-1
Instrument an d control functions ... 5-1
Indicator lights and warning lights............................................ 5-1
Speedometer .................................. 5-3
Tachometer .................................... 5-3
Multi-function display ..................... 5-4
Handlebar switches ...................... 5-12
Front brake lever .......................... 5-14
Rear brake lever ........................... 5-14 Anti-lock brake system (ABS) ....... 5-14
Traction control system ................ 5-15
Fuel tank cap ................................ 5-17
Fuel ............................................... 5-18
Fuel tank overflow hose ................ 5-20
Catalytic converter ........................ 5-20
Storage compartments ................. 5-20
Windshield .................................... 5-22
Handlebar position ....................... 5-25
Adjusting the shock absorber
assemblies ................................. 5-25
Auxiliary DC jack .......................... 5-26
Sidestand ...................................... 5-27
Ignition circuit cut-off system ....... 5-27
For your safety – pre-operation
checks ............................................... 6-1
Operation an d important ri din g
points ................................................. 7-1
Engine break-in ............................... 7-1
Starting the engine .......................... 7-2
Starting off ...................................... 7-3
Acceleration and deceleration ........ 7-3
Braking ............................................ 7-3
Tips for reducing fuel consumption ................................ 7-4
Parking ........................................... 7-4 Perio
dic maintenance an d
a d justment ........................................ 8-1
Tool kit ............................................ 8-2
Periodic maintenance chart for the emission control system ............. 8-3
General maintenance and lubrication chart .......................... 8-4
Removing and installing the
panel............................................ 8-8
Checking the spark plug................. 8-9
Canister ........................................ 8-10
Engine oil and oil strainer ............. 8-10
Final transmission oil .................... 8-12
Coolant ......................................... 8-13
Air filter and V-belt case air filter elements .................................... 8-14
Checking the throttle grip free
play ............................................ 8-17
Valve clearance............................. 8-17
Tires .............................................. 8-17
Cast wheels .................................. 8-19
Checking the front and rear brake lever free play ............................ 8-19
Checking the front and rear brake pads .......................................... 8-20
Checking the brake fluid level ...... 8-21
Changing the brake fluid .............. 8-22
Checking the V-belt ...................... 8-22
Checking and lubricating the
cables ........................................ 8-23UB9YE0E0.book Page 1 Wednesday, January 6, 2021 3:03 PM

Safety information
1-3
1Avoi
d Car bon Monoxi de Poisonin g
All engine exhaust contains carbon
monoxide, a deadly gas. Breathing
carbon monoxide can cause head-
aches, dizziness, drowsiness, nausea,
confusion, and eventually death.
Carbon Monoxide is a colorless, odor-
less, tasteless gas which may be pres-
ent even if you do not see or smell any
engine exhaust. Deadly levels of car-
bon monoxide can collect rapidly and
you can quickly be overcome and un-
able to save yourself. Also, deadly lev-
els of carbon monoxide can linger for
hours or days in enclosed or poorly
ventilated areas. If you experience any
symptoms of carbon monoxide poi-
soning, leave the area immediately, get
fresh air, and SEEK MEDICAL TREAT-
MENT.  Do not run engine indoors. Even if
you try to ventilate engine exhaust
with fans or open windows and
doors, carbon monoxide can rap-
idly reach dangerous levels.
 Do not run engine in poorly venti-
lated or partially enclosed areas
such as barns, garages, or car-
ports. 
Do not run engine outdoors where
engine exhaust can be drawn into
a building through openings such
as windows and doors.
Loa din g
Adding accessories or cargo to your
scooter can adversely affect stability
and handling if the weight distribution
of the scooter is changed. To avoid the
possibility of an accident, use extreme
caution when adding cargo or acces-
sories to your scooter. Use extra care
when riding a scooter that has added
cargo or accessories. Here, along with
the information about accessories be-
low, are some general guidelines to fol-
low if loading cargo to your scooter:
The total weight of the operator, pas-
senger, accessories and cargo must
not exceed the maximum load limit.
Operation of an overloa ded vehicle
coul d cause an acci dent.
When loading within this weight limit,
keep the following in mind: 
Cargo and accessory weight
should be kept as low and close to
the scooter as possible. Securely
pack your heaviest items as close
to the center of the vehicle as pos-
sible and make sure to distribute
the weight as evenly as possible
on both sides of the scooter to
minimize imbalance or instability.
 Shifting weights can create a sud-
den imbalance. Make sure that
accessories and cargo are se-
curely attached to the scooter be-
fore riding. Check accessory
mounts and cargo restraints fre-
quently.
• Properly adjust the suspension for your load (suspension-ad-
justable models only), and
check the condition and pres-
sure of your tires.
• Never attach any large or heavy items to the handlebar, front
fork, or front fender. Such items
can create unstable handling or
a slow steering response.
 This vehicle is not desi gne d to
pull a trailer or to be attached to
a si decar.
Maximum loa d:
185 kg (408 lb)
UB9YE0E0.book Page 3 Wednesday, January 6, 2021 3:03 PM

Stop and Start System
4-1
4
EAU76825
Stop and 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 coul d 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 and Start System opera-
tion
EAU76687
Activating 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 “ ”ZAUM1887
1
ZAUM1983
ON
A
AA
ZAUM1888
UB9YE0E0.book Page 1 Wednesday, January 6, 2021 3:03 PM

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. Stop and Start System indicator light “ ”
A
ZAUM1889
1
A
AAAA
A
ZAUM1890
AA
A
1. On
2. Flashing
A
1
2
A
UB9YE0E0.book Page 2 Wednesday, January 6, 2021 3:03 PM

Instrument and control functions
5-1
5
EAU4939P
In dicator li ghts an d warnin g
li g hts
EAU88680
Turn si gnal in dicator li ghts “ ”
an d“”
Each indicator light will flash when its
corresponding turn signal lights are
flashing.
EAU88690
Hi gh beam in dicator li ght “ ”
This indicator light comes on when the
high beam of the headlight is switched
on.
EAU88711
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 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 vehicle pow-
er 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 controlled for
the on-board diagnostic system to de-
tect deterioration and malfunction of
the emission control system. Due to
this specification, the MIL may come
on or flash for vehicle modifications,
lack of maintenance, or excessive or
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 drivetrain specifi-
cations (chain, sprockets, wheels,
tires, etc.).
 Do not remove or alter the O2 sen-
sor, air induction system, or ex-
haust parts (catalysts or EXUP,
etc.).
 Maintain proper V-belt and drive
belt (if equipped).
1. Turn signal indicator lights “ ” and “ ”
2. High beam indicator light “ ”
3. ABS warning light “ ”
4. Malfunction indicator light “ ”
5. Traction control system indicator
light “ ”
6. Stop and Start System indicator light “ ”
7. Smart key system indicator light “ ”ZAUM1896
1
234
567
UB9YE0E0.book Page 1 Wednesday, January 6, 2021 3:03 PM

Instrument and control functions
5-2
5

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 lig ht “ ”
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 li ght does not
turn off after reachin g 10 km/h (6
mi/h), or if the warnin g lig ht comes
on while ri din g:
 Use extra caution to avoi d pos-
si ble wheel lock durin g emer-
g ency brakin g.
 Have a Yamaha dealer check
the vehicle as soon as possi ble.
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 in dicator
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 5-15.)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 “ ”, this indicator light may not
come on. (See page 4-1.)
A
UB9YE0E0.book Page 2 Wednesday, January 6, 2021 3:03 PM

Instrument and control functions
5-5
5 5. Push the “TRIP” switch for three
seconds, and then release it. The
minute digits will start flashing.
6. Use the “TRIP” switch to set the minutes.
7. Push the “TRIP” switch for three seconds, and then release it to
start the clock.
Fuel meter
The fuel meter indicates the amount of
fuel in the fuel tank. The segments of
the fuel meter disappear from “F” (full)
towards “E” (empty) as the fuel level
decreases. When the last segment of
the fuel meter starts flashing, refuel as
soon as possible.
TIP If a problem is detected in the fuel
meter, the all segments will flash
repeatedly. If this occurs, have a
Yamaha dealer check the vehicle.
 When approximately 2.3 L (0.61
US gal, 0.51 Imp.gal) of fuel re-
mains in the fuel tank, the last seg-
ment of the fuel meter will start
flashing. The display will automat-
ically change to the fuel reserve
tripmeter “F Trip” and start count-
ing the distance traveled from that
point.Coolant temperature meter The coolant temperature meter indi-
cates the temperature of the coolant.
If the top segment flashes, stop the ve-
hicle, then stop the engine, and let the
engine cool. (See page 8-33.)
NOTICE
ECA10022
Do not continue to operate the en-
g
ine if it is overheatin g.TIP If a problem is detected in the
coolant temperature meter, all
segments will flash repeatedly. If
this occurs, have a Yamaha dealer
check the vehicle as soon as pos-
sible.
 The coolant temperature varies
with changes in the weather and
engine load.
1. Fuel meterZAUM14831
1. Coolant temperature meterZAUM1484
1
UB9YE0E0.book Page 5 Wednesday, January 6, 2021 3:03 PM

Instrument and control functions
5-10
5
This display shows the current charge
state of the battery.
TIP
If the engine turns over slowly
when using the start switch, have
a Yamaha dealer charge the bat-
tery.
 If “---” appears in the battery volt-
age display, have a Yamaha deal-
er check the battery.Traction control system display
This display shows the current status
of the traction control system. (See
page 5-15.)  “TCS ON”: the system is on
 “TCSOFF”: the system is off
TIPIf only “TCS” is displayed, there is a
communication error within the vehi-
cle. Have a Yamaha dealer check the
vehicle as soon as possible.Avera ge fuel consumption display
This function calculates the average
fuel consumption since it was last re-
set.
The average fuel consumption can be
displayed as either “Consump-
tion/Average_ _._ km/L”, “Consump-
tion/Average_ _._ L/100 km” or
“Consumption/Average_ _ _._ MPG”
(for the UK). 
“Consumption/Average_ _._
km/L”: The average distance that
can be traveled on 1.0 L of fuel is
shown.
 “Consumption/Average_ _._
L/100 km”: The average amount
of fuel necessary to travel 100 km
is shown.
 “Consumption/Average_ _ _._
MPG” (for the UK): The average
distance that can be traveled on
1.0 Imp.gal of fuel is shown.
To reset the average fuel consumption,
push the “INFO” switch for at least
three seconds.
TIPAfter resetting the average fuel con-
sumption, “_ _._” will be shown until
the vehicle has traveled 1 km (0.6 mi).
1. Traction control system displayZAUM1493
1
1. Average fuel consumption displayZAUM1494
1
UB9YE0E0.book Page 10 Wednesday, January 6, 2021 3:03 PM