2021 YAMAHA MT-125 fuel consumption

Table of contentsSafety information ............................ 1-1
Description ....................................... 2-1
Left view ......................................... 2-1
Right view ....................................... 2-2
Controls and instruments ............... 2-3
Instrument an d control functions ... 3-1
Main switch/steering lock............... 3-1
Indicator lights and warning lights............................................ 3-2
Multi-function meter unit ................ 3-4
Handlebar switches ...................... 3-12
Clutch lever .................................. 3-13
Shift pedal .................................... 3-14
Brake lever.................................... 3-14
Brake pedal .................................. 3-14
ABS .............................................. 3-15
Fuel tank cap ................................ 3-16
Fuel ............................................... 3-16
Fuel tank breather hose and overflow hose ............................ 3-18
Catalytic converter ....................... 3-19
Seat .............................................. 3-19
Helmet holder ............................... 3-20
Sidestand ..................................... 3-20
Ignition circuit cut-off system ....... 3-21 For your safety – pre-operation
checks
............................................... 4-1
Operation an d important ri din g
points ................................................. 5-1
Engine break-in ............................... 5-1
Starting the engine .......................... 5-2
Shifting ............................................ 5-3
Tips for reducing fuel consumption ................................ 5-4
Parking ............................................ 5-4
Perio dic maintenance an d
a d justment ........................................ 6-1
Tool kit ............................................ 6-2
Periodic maintenance chart for the emission control system .............. 6-3
General maintenance and lubrication chart ........................... 6-4
Removing and installing cowlings... 6-8
Checking the spark plug ................. 6-8
Canister ........................................... 6-9
Engine oil and oil filter element ..... 6-10
Why Yamalube .............................. 6-12
Coolant.......................................... 6-13
Replacing the air filter element
and cleaning the check hose..... 6-14
Adjusting the engine idling speed ......................................... 6-15
Adjusting the throttle grip free play ............................................ 6-16 Valve clearance............................. 6-16
Tires .............................................. 6-17
Cast wheels .................................. 6-19
Adjusting the clutch lever free
play ............................................ 6-19
Checking the front brake lever free play..................................... 6-20
Adjusting the brake pedal free
play ............................................ 6-21
Brake light switches ..................... 6-21
Checking the front and rear brake pads .......................................... 6-22
Checking the brake fluid level ...... 6-22
Changing the brake fluid .............. 6-24
Drive chain slack........................... 6-24
Cleaning and lubricating the drive chain.......................................... 6-25
Checking and lubricating the cables ........................................ 6-26
Checking and lubricating the
throttle grip and cable ............... 6-26
Checking and lubricating the brake and shift pedals............... 6-27
Checking and lubricating the brake and clutch levers ............. 6-27
Checking and lubricating the
sidestand................................... 6-28
Lubricating the rear suspension ... 6-28
Checking the front fork ................. 6-29
Checking the steering................... 6-29
Checking the wheel bearings ....... 6-30UB6GE1E0.book Page 1 Thursday, July 30, 2020 1:08 PM

Instrument and control functions
3-6
3
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.
Tachometer
The tachometer allows the rider to
monitor the engine speed and keep it
within the ideal power range.
NOTICE
ECA23050
Do not operate the en
gine in the ta-
chometer hi gh-r/min zone. Hi
gh-r/min zone: 11000 r/min an d
a b ove
Transmission gear display
This display shows the selected gear.
The neutral position is indicated by “ ”
and by the neutral indicator light. Multi-function
display
The multi-function display is equipped
with the following:  an odometer
 two tripmeters
 a fuel reserve tripmeter
 an instantaneous fuel consump-
tion display
 an average fuel consumption dis-
play
 an average speed display
 a brightness screen and shift tim-
ing indicator light control mode
 welcome screen display
 a self diagnostic device
Push the “SELECT” button to switch
the display between the odometer
mode “ODO”, tripmeters mode “TRIP
1. Tachometer
2. Tachometer red zoneZAUM1572
1 2
1. Neutral indicator light “ ”
2. Transmission gear displayZAUM15731
2
1. Multi-function displayZAUM1574
1
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Instrument and control functions
3-7
3 1” and “TRIP 2”, instantaneous fuel
consumption mode “km/L” or “L/100
km”, average fuel consumption mode
“AVE_ _._ km/L” or “AVE_ _._ L/100
km” and average speed mode “AVE_
_._ km/h” in the following order:
ODO
→ TRIP 1 → TRIP 2 → km/L or
L/100 km → AVE_ _._ km/L or AVE_ _._
L/100 km → AVE_ _._ km/h → ODO
For the UK:
Push the “SELECT” button to switch
the display between the odometer
mode “ODO”, tripmeters mode “TRIP
1” and “TRIP 2”, instantaneous fuel
consumption mode “km/L” or “L/100
km” or “MPG”, average fuel consump-
tion mode “AVE_ _._ km/L”, “AVE_ _._
L/100 km” or “AVE_ _ _._ MPG” and
average speed mode “AVE_ _._ km/h”
or “AVE_ _._ MPH” in the following or-
der:
ODO → TRIP 1 → TRIP 2 → km/L or
L/100 km or MPG → AVE_ _._ km/L or
AVE_ _._ L/100 km or AVE_ _ _._
MPG → AVE_ _._ km/h or AVE_ _._
MPH → ODO Push the “RESET” button to switch
display backward.
If the last segment of the fuel meter
starts flashing, the display automati-
cally changes to the fuel reserve trip-
meter mode “TRIP F” and starts
counting the distance traveled from
that point. In that case, push the “SE-
LECT” button to switch the display be-
tween the various tripmeter, odometer,
instantaneous fuel consumption, aver-
age fuel consumption, and average
speed modes in the following order:
TRIP F
→ km/L or L/100 km → AVE_
_._ km/L or AVE_ _._ L/100 km → AVE_
_._ km/h → ODO → TRIP 1 → TRIP 2
→ TRIP F
For the UK:
TRIP F → km/L, L/100 km or MPG →
AVE_ _._ km/L, AVE_ _._ L/100 km or
AVE_ _ _._ MPG → AVE_ _._ km/h or
AVE_ _._ MPH → ODO → TRIP 1 →
TRIP 2 → TRIP F To reset a tripmeter, select it by push-
ing the “SELECT” button and then
push and hold the “RESET” button.
If you do not reset the fuel reserve trip-
meter manually, it resets itself auto-
matically and the display returns to the
prior mode after refueling and traveling
5 km (3 mi).
O
dometer mo de
The odometer shows the total distance
traveled by the vehicle. It will lock at
999999 and cannot be reset.
1. OdometerZAUM1575
1
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Instrument and control functions
3-8
3
Tripmeters mo
de
The tripmeters shows the total dis-
tance traveled since they were last re-
set.
To reset a tripmeter, push and hold the
“RESET” button.
TIP The tripmeters will reset and con-
tinue counting after 9999.9 is
reached. To reset the tripmeters,
while it is being displayed, push
and hold the “RESET” button.
Instantaneous fuel consumption
mo de
Shows the current fuel consumption
when the vehicle is traveling at least 10
km/h (6 mi/h).
The instantaneous fuel consumption
can be set to either “km/L”, “L/100 km”
or “MPG” (for the UK).
To switch the instantaneous fuel con-
sumption display between “km/L”,
“L/100 km” and “MPG” (for the UK),
push and hold the “SELECT” button.  “km/L”: The distance that can be
traveled on 1.0 L of fuel under the
current riding conditions is shown. 
“L/100 km”: The amount of fuel
necessary to travel 100 km under
the current riding conditions is
shown.
 “MPG” (for the UK): The distance
that can be traveled on
1.0 Imp.gal of fuel under the cur-
rent riding conditions is shown.
TIPIf traveling at speeds under 10
km/h (6 mi/h), “_ _._” is displayed.
 The instantaneous fuel consump-
tion function should be used for
general reference only. Do not use
this figure to estimate the distance
that can be traveled on the current
tank of fuel.
1. TripmeterZAUM1576
1
1. Instantaneous fuel consumption displayZAUM1577
1
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Instrument and control functions
3-9
3 Averag
e fuel consumption mod e
Show the average fuel consumption
since it was last reset.
The average fuel consumption can be
set to either “AVE_ _._ km/L”, “AVE_
_._ L/100 km” or “AVE_ _ _._ MPG” (for
the UK).
To switch the average fuel consump-
tion display between “AVE_ _._ km/L”,
“AVE_ _._ L/100 km” or “AVE_ _ _._
MPG” (for the UK), push and hold the
“SELECT” button.  “AVE_ _._ km/L”: The average dis-
tance that can be traveled on 1.0 L
of fuel is shown.
 “AVE_ _._ L/100 km”: The average
amount of fuel necessary to travel
100 km is shown. 
“AVE_ _ _._ 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
display, push and hold the “RESET”
button.
TIP After resetting the average fuel
consumption, “_ _._” will be
shown until the vehicle has trav-
eled 1 km (0.6 mi).
The average fuel consumption
function should be used for gener-
al reference only. Do not use this
figure to estimate the distance
that can be traveled on the current
tank of fuel.
Averag e speed mode
Shows the vehicle’s traveling speed
since it was last reset.
To reset the average speed display,
push and hold the “RESET” button un-
til the average speed flashes, and then
push the button again.
1. Average fuel consumption displayZAUM1578
1
1. Average speed displayZAUM1579
1
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Operation and important rid ing points
5-4
5 The neutral indicator light should
come on and then the clutch lever
can be released.
WARNING
EWA17380

Improper brakin g can cause
loss of control or traction. Al-
ways use b oth brakes an d apply
them smoothly.
 Make sure that the motorcycle
and the en gine have sufficiently
slowe d b efore shiftin g to a low-
er gear. En gag in g a lower gear
when the vehicle or en gine
speed is too hi gh coul d make
the rear wheel lose traction or
the en gine to over-rev. This
coul d cause loss of control, an
acci dent an d injury. It coul d also
cause en gine or drive train dam-
a g e.
EAU16811
Tips for re ducin g fuel con-
sumptionFuel consumption depends largely on
your riding style. Consider the follow-
ing tips to reduce fuel consumption:
 Shift up swiftly, and avoid high en-
gine speeds during acceleration.
 Do not rev the engine while shift-
ing down, and avoid high engine
speeds with no load on the en-
gine.
 Turn the engine off instead of let-
ting it idle for an extended length
of time (e.g., in traffic jams, at traf-
fic lights or at railroad crossings).
EAU17214
Parkin gWhen parking, stop the engine, and
then remove the key from the main
switch.
WARNING
EWA10312
Since the en gine an d exhaust
system can become very hot,
park in a place where pe destri-
ans or chil dren are not likely to
touch them an d b e burne d.
 Do not park on a slope or on soft
groun d, otherwise the vehicle
may overturn, increasin g the
risk of a fuel leak an d fire.
 Do not park near grass or other
flammab le materials which
mi ght catch fire.
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10-1
10
IndexAABS ....................................................... 3-15
ABS warning light ................................... 3-3
Air filter element and check hose,
replacing and cleaning ....................... 6-14BBattery .................................................. 6-30
Brake and clutch levers, checking and lubricating ........................................... 6-27
Brake and shift pedals, checking and lubricating ........................................... 6-27
Brake fluid, changing ............................ 6-24
Brake fluid level, checking .................... 6-22
Brake lever ............................................ 3-14
Brake light switches.............................. 6-21
Brake pedal........................................... 3-14
Brake pedal free play, adjusting ........... 6-21CCables, checking and lubricating ......... 6-26
Canister................................................... 6-9
Care ........................................................ 7-1
Catalytic converter ................................ 3-19
Clutch lever ........................................... 3-13
Clutch lever free play, adjusting ........... 6-19
Coolant ................................................. 6-13
Coolant temperature warning light ......... 3-2
Cowlings, removing and installing .......... 6-8DData recording, vehicle ........................... 9-2
Diagnostic connector.............................. 9-2
Dimmer switch ...................................... 3-13
Drive chain, cleaning and lubricating .... 6-25
Drive chain slack................................... 6-24
EEngine break-in ...................................... 5-1
Engine idling speed .............................. 6-15
Engine oil and oil filter element ............ 6-10
Engine overheating ............................... 6-36
Engine serial number .............................. 9-1FFront and rear brake pads, checking ... 6-22
Front brake lever free play, checking ... 6-20
Front fork, checking ............................. 6-29
Fuel ....................................................... 3-16
Fuel consumption, tips for reducing ...... 5-4
Fuel tank breather hose and overflow hose ................................................... 3-18
Fuel tank cap ........................................ 3-16
Fuses, replacing ................................... 6-31HHandlebar switches .............................. 3-12
Helmet holder ....................................... 3-20
High beam indicator light ....................... 3-2
Horn switch .......................................... 3-13IIdentification numbers ............................ 9-1
Ignition circuit cut-off system ............... 3-21
Indicator lights and warning lights ......... 3-2LLicense plate light bulb, replacing........ 6-33MMain switch/steering lock....................... 3-1
Maintenance and lubrication, periodic ... 6-4
Maintenance, emission control system.................................................. 6-3
Malfunction indicator light (MIL) ............. 3-3
Matte color, caution ............................... 7-1 Model label .............................................9-1
Multi-function meter unit .........................3-4
NNeutral indicator light ..............................3-2PParking ....................................................5-4
Part locations ..........................................2-1
Pass switch ...........................................3-13RRear suspension, lubricating ................6-28SSafety information ...................................1-1
Seat .......................................................3-19
Shifting ....................................................5-3
Shift light .................................................3-3
Shift pedal .............................................3-14
Sidestand ..............................................3-20
Sidestand, checking and lubricating.....6-28
Spark plug, checking ..............................6-8
Specifications .........................................8-1
Start/Engine stop switch .......................3-13
Starting the engine ..................................5-2
Steering, checking ................................6-29
Storage ...................................................7-3
Supporting the motorcycle ...................6-34TTail/brake light ......................................6-32
Throttle grip and cable, checking and
lubricating ...........................................6-26
Throttle grip free play, adjusting ...........6-16
Tires ......................................................6-17
Tool kit ....................................................6-2
Troubleshooting ....................................6-34
Troubleshooting chart ...........................6-35
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