key YAMAHA MT-125 2021 Owners Manual

Important manual information
EAU10134
Particularly important information is distinguished in this manual by the following notations:
*Product and specifications are subject to change without notice.This is the safety alert sym
bol. It is use d to alert you to potential personal injury
hazar ds. Ob ey all safety messa ges that follow this sym bol to avoi d possi ble injury
or death.
A WARNING in dicates a hazar dous situation which, if not avoi ded , coul d result in
d eath or serious injury.
A NOTICE in dicates special precautions that must be taken to avoi d d ama ge to the
vehicle or other property.
A TIP provides key information to make procedures easier or clearer.
WARNING
NOTICETIP
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Instrument and control functions
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3
EAU10462
Main switch/steerin g lockThe main switch/steering lock controls
the ignition and lighting systems, and is
used to lock the steering. The various
positions are described below.
EAU85050
ON
All electrical circuits are supplied with
power and the vehicle lights are turned
on. The engine can be started. The key
cannot be removed.TIP To prevent battery discharge, do
not leave the key in the on position
without the engine running.
 The headlight comes on automat-
ically when the engine is started. 
The headlight will stay on until the
key is turned to “OFF”, even if the
engine stalls.
EAU10662
OFF
All electrical systems are off. The key
can be removed.
WARNING
EWA10062
Never turn the key to “OFF” or
“LOCK” while the vehicle is movin g.
Otherwise the electrical systems will
b e switche d off, which may result in
loss of control or an acci dent.
EAU10696
LOCK
The steering is locked and all electrical
systems are off. The key can be re-
moved. To lock the steering
1. Turn the handlebars all the way to
the left or right.
2. With the key in the “OFF” position, push the key in and turn it to
“LOCK”.
3. Remove the key.TIPIf the steering will not lock, try turning
the handlebars back to the right or left
slightly.1. Push.
2. Turn.12
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Instrument and control functions
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To unlock the steering
From the “LOCK” position, push the
key and turn it to “OFF”.
EAU4939N
In
dicator li ghts an d warnin g
lig hts
EAU11022
Turn si gnal in dicator li ght “ ”
This indicator light flashes when a turn
signal light is flashing.
EAU11061
Neutral in dicator li ght “ ”
This indicator light comes on when the
transmission is in the neutral position.
EAU11081
Hi gh beam in dicator li ght “ ”
This indicator light comes on when the
high beam of the headlight is switched
on.
EAU11449
Coolant temperature warnin g
li g ht “ ”
This warning light comes on when the
engine is overheating. If this occurs,
stop the engine immediately and allow
the engine to cool. (See page 6-36.)
For vehicles with a radiator fan, the ra-
diator fan(s) automatically switch on or
off according to the coolant tempera-
ture.TIPWhen the vehicle is turned on, the light
will 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 the vehicle. NOTICE
ECA10022
Do not continue to operate the en-
g ine if it is overheatin g.
1. Push.
2. Turn.12
1. Shift light
2. Turn signal indicator light “ ”
3. High beam indicator light “ ”
4. Anti-lock Brake System (ABS) warning
light “ ”
5. Malfunction indicator light “ ”
6. Coolant temperature warning light “ ”
7. Neutral indicator light “ ”ZAUM15665 6 7
2
3
4
1
ABS
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Instrument and control functions
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3
TIPWhen the vehicle is turned on, the light
will come on for a few seconds and
then go off. If the light does not come
on, have a Yamaha dealer check the
vehicle.
EAUM4011
Multi-function meter unit
WARNING
EWA12423
Be sure to stop the vehicle before
makin g any settin g chan ges to the
multi-function meter unit. Chan gin g
settin gs while ri din g can distract the
operator an d increase the risk of an
acci dent.The multi-function meter unit is
equipped with the following:
 a speedometer
 a clock
 a fuel meter
 a VVA indicator
 a tachometer 
a transmission gear display
 a multi-function display
 a shift timing indicator light
 a self diagnostic device
TIPExcept when accessing the
brightness screen and shift timing
indicator light control mode or
when displaying the welcome
screen, the key must be turned
to “ ” before you can use the
“SELECT” and “RESET” buttons
to adjust the multi-function meter.
 For the UK: To switch between ki-
lometers and miles, press and
hold the “SELECT” button.
1. “SELECT” button
2. “RESET” buttonZAUM1567
1
2
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Instrument and control functions
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3 Speed
ometer
The speedometer shows the vehicle’s
traveling speed.
Clock mo de
The clock uses a 12-hour time system. To set the clock
1. Push and hold the “SELECT” and
“RESET” button together.
2. When the hour digits start flash- ing, use the “RESET” button to set
the hours.
3. Push the “SELECT” button and the minutes will start flashing.
4. Use the “RESET” button to set the minutes.
5. Push the “SELECT” button to start the clock.
Fuel meter
The fuel meter indicates the amount of
fuel in the fuel tank. The display seg-
ments of the fuel meter disappear to-
wards “E” (empty) as the fuel level decreases. When the last segment
start flashing, refuel as soon as possi-
ble.
When the key is turned to “ ”, the dis-
play segments of the fuel meter will
sweep once across the fuel level range
and then return to the current amount
in order to test the electrical circuit.
TIPThe fuel meter is equipped with a self-
diagnostic function. If a problem is de-
tected in the fuel meter electrical cir-
cuit, the fuel meter will flash
repeatedly. If this occurs, have a
Yamaha dealer check the vehicle.VVA in dicator
1. Speedometer
1. ClockZAUM1568
1
ZAUM1569
1
1. Fuel meterZAUM1570
1
1. VVA (variable valve actuation) indicatorZAUM1571
1
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Instrument and control functions
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3
Bri
ghtness screen an d shift timin g
in dicator li ght control mo de
This mode cycles through five control
functions in the order listed below.  Brightness screen: the multi-func-
tion meter unit can be adjusted for
the brightness screen.
 Shift timing light flashing pattern:
this function allows you to choose
whether or not the indicator light
will come on and whether it should
flash or stay on when activated.
 Shift timing light activation point:
this function allows you to select
the engine speed at which the in-
dicator light is activated. 
Shift timing light deactivation
point: this function allows you to
select the engine speed at which
the indicator light is deactivated.
 Shift timing light brightness: this
function allows you to adjust the
brightness of the indicator light.
To adjust the brightness screen and
shift timing indicator light1. Turn the key to “ ”.
2. Push and hold the “SELECT” but- ton.
3. Turn the key to “ ”, and then re- lease the “SELECT” button after
five seconds. After that push the
“SELECT” button again. The
brightness screen can now be ad-
justed.
To set the brightness screen1. Push the “RESET” button to select the desired brightness level.
2. Push the “SELECT” button to confirm the selected brightness
screen level. The brightness
screen light changes to the shift
flashing pattern setting mode. To set the shift flashing pattern
1. Push the “RESET” button to select
one of the following flashing pat-
tern settings: On: the indicator light stays
on when activated. (This set-
ting is selected when the indi-
cator light stays on.)
 Flash: the indicator light
flashes when activated. (This
setting is selected when the
indicator light flashes four
times per second.)
 Off: the indicator light is deac-
tivated; in other words, it
does not come on or flash.
(This setting is selected when
the indicator light flashes
once every two seconds.)
2. Push the “SELECT” button to con- firm the selected flashing pattern.
The shift timing indicator light
changes to the activation point
setting mode.
The tachometer will show the current
setting r/min for the activation point
and deactivation point setting modes.
1. Shift timing indicator light
2. Brightness level displayZAUM1580
21
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Instrument and control functions
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3 To set the shift activation point
TIPThe shift timing indicator light activa-
tion point can be set between 9000
r/min and 13000 r/min. The indicator
light can be set in increments of 500
r/min.1. Push the “RESET” button to select
the desired engine speed for acti-
vating the indicator light.
2. Push the “SELECT” button to con- firm the selected engine speed.
The control mode changes to the
deactivation point setting mode.
To set the shift deactivation pointTIP The shift timing indicator light de-
activation point can be set be-
tween 9000 r/min and 13000
r/min. The indicator light can be
set in increments of 500 r/min.
 Be sure to set the deactivation
point to a higher engine speed
than for the activation point, other-
wise the shift timing indicator light
will not come on.
1. Push the “RESET” button to select
the desired engine speed for de-
activating the indicator light.
2. Push the “SELECT” button to con- firm the selected engine speed.
The control mode changes to the
brightness setting mode.
To adjust the shift brightness1. Push the “RESET” button to select the desired shift indicator light
brightness level.
2. Push the “SELECT” button to con- firm the selected brightness level.
The display exits the shift timing
light control mode and returns to
the standard multi-function dis-
play mode.
Welcome screen
The welcome screen greets the rider
when the key is turned to “ ” with the
messages “Hi Buddy” and “see you”
when the key is turned to “ ”. The
user name “Buddy” is set as the facto-
ry default, but it can be set to your
name. To set the user name
1. Turn the key to “ ”.
2. Push and hold the “RESET” but-
ton.
3. Turn the key to “ ”, and then re- lease the “RESET” button after
four seconds.
4. When the first character starts flashing, push the “SELECT” but-
ton to display the next alpha nu-
merical character, push the
“RESET” button to switch to the
previous character.
5. Push and hold the “SELECT” but- ton to confirm the selected char-
acter. The second character will
start flashing. Repeat this process1. Hyphen
2. SpaceZAUM1581
AB C Y Z
012
9
-_
1
2
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Instrument and control functions
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3
EAU63040
ABSThe Yamaha ABS (Anti-lock Brake
System) features a dual electronic con-
trol system, which acts on the front and
rear brakes independently.
Operate the brakes with ABS as you
would conventional brakes. If the ABS
is activated, a pulsating sensation may
be felt at the brake lever or brake ped-
al. In this situation, continue to apply
the brakes and let the ABS work; do
not “pump” the brakes as this will re-
duce braking effectiveness.
WARNING
EWA16051
Always keep a sufficient d istance
from the vehicle ahea d to match the
ri din g speed even with ABS.
 The ABS performs best with
lon g b rakin g d istances.
 On certain surfaces, such as
rou gh or g ravel roa ds, the b rak-
in g d istance may b e longer with
the ABS than without.The ABS is monitored by an ECU,
which will revert the system to conven-
tional braking if a malfunction occurs.
TIP The ABS performs a self-diagno-
sis test each time the vehicle first
starts off after the key is turned to
“ON” and the vehicle has traveled
at a speed of 10 km/h (6 mi/h) or
higher. During this test, a “click-
ing” noise can be heard from the
hydraulic control unit, and if the
brake lever or brake pedal is even
slightly applied, a vibration can be
felt at the lever and pedal, but
these do not indicate a malfunc-
tion.
 This ABS has a test mode which
allows the owner to experience
the pulsation at the brake lever or
brake pedal when the ABS is op-
erating. However, special tools are
required, so please consult your
Yamaha dealer.NOTICE
ECA20100
Be careful not to damag e the wheel
sensor or wheel sensor rotor; other-
wise, improper performance of the
ABS will result.
1. Front wheel sensor rotor
2. Front wheel sensor
1. Rear wheel sensor
2. Rear wheel sensor rotorZAUM173412ZAUM1590
12
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Instrument and control functions
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EAU13077
Fuel tank capTo open the fuel tank cap
Open the fuel tank cap lock cover, in-
sert the key, and then turn it 1/4 turn
clockwise. The lock will be released
and the fuel tank cap can be opened.
To close the fuel tank cap
With the key still inserted, push down
the fuel tank cap. Turn the key 1/4 turn
counterclockwise, remove it, and then
close the lock cover.
TIPThe fuel tank cap cannot be closed un-
less the key is in the lock. In addition,
the key cannot be removed if the cap is
not properly closed and locked.
WARNING
EWA11092
Make sure that the fuel tank cap is
properly close d after fillin g fuel.
Leakin g fuel is a fire hazar d.
EAU13222
FuelMake sure there is sufficient gasoline in
the tank.
WARNING
EWA10882
Gasoline an d gasoline vapors are
extremely flammab le. To avoid fires
an d explosions an d to re duce the
risk of injury when refuelin g, follow
these instructions.1. Before refueling, turn off the en- gine and be sure that no one is sit-
ting on the vehicle. Never refuel
while smoking, or while in the vi-
cinity of sparks, open flames, or
other sources of ignition such as
the pilot lights of water heaters
and clothes dryers.
2. Do not overfill the fuel tank. When refueling, be sure to insert the
pump nozzle into the fuel tank filler
hole. Stop filling when the fuel
reaches the bottom of the filler
tube. Because fuel expands when
it heats up, heat from the engine or
the sun can cause fuel to spill out
of the fuel tank.
1. Fuel tank cap lock cover
2. Unlock.
1
2
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Instrument and control functions
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3
EAU13435
Catalytic converterThe exhaust system contains catalytic
converter(s) to reduce harmful exhaust
emissions.
WARNING
EWA10863
The exhaust system is hot after op-
eration. To prevent a fire hazar d or
b urns:
 Do not park the vehicle near
possi ble fire hazard s such as
g rass or other materials that
easily burn.
 Park the vehicle in a place
where ped estrians or chil dren
are not likely to touch the hot
exhaust system.
 Make sure that the exhaust sys-
tem has cooled down before
d oin g any maintenance work.
 Do not allow the en gine to i dle
more than a few minutes. Lon g
i d lin g can cause a b uild-up of
heat.
EAU57992
SeatTo remove the seat 1. Open the seat lock cover, insert the key into the seat lock, and then
turn the key counterclockwise.
2. While holding the key in that posi- tion, slide the seat backward and
then lift the rear of the seat up, and
then pull the seat off.
To install the seat 1. Insert the projections into the seat holders as shown. 2. Push the rear of the seat down to
lock it in place.
3. Remove the key.
TIPMake sure that the seat is properly se-
cured before riding.
1. Seat lock cover
2. Seat lock
3. Turn.
1 2 3
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