
Instrument and control functions
3-15
3
EAU60621
SeatTo open the seat
1. Place the vehicle on the center- stand.
2. Insert the key into the main switch, and then turn it counterclockwise
to “SEAT OPEN”.
MW125 MW125A
TIPDo not push inward when turning the
key.3. Fold the seat up.
To close the seat 1. Fold the seat down, and then push it down to lock it in place.
2. Remove the key.TIPMake sure that the seat is properly se-
cured before riding.
EAUT3711
Passen ger footrestTo use the passenger footrest, pull it
out as shown.
To retract the passenger footrest, push
it back to original position.
1. Open.
1
1. Open.
1
1. Passenger footrest
1
U2CME2E0.book Page 15 Friday, August 21, 2015 9:16 AM

Instrument and control functions
3-19
3
Turn the key on.
Put the sidestand up.Push the start switch while applying
either of the brake levers. The engine will
start.Put the sidestand down.
If the engine stalls:
The sidestand switch is OK.
• The vehicle must be placed on the center-
stand during this inspection.• If a malfunction is noted, have a Yamaha
dealer check the system before riding.
WARNING
U2CME2E0.book Page 19 Friday, August 21, 2015 9:16 AM

Operation and important ri din g points
5-1
5
EAU15952
Read the Owner’s Manual carefully to
become familiar with all controls. If
there is a control or function you do not
understand, ask your Yamaha dealer.
WARNING
EWA10272
Failure to familiarize yourself with
the controls can lead to loss of con-
trol, which coul d cause an acci dent
or injury.
EAU45311
TIPThis model is equipped with a lean an-
gle sensor to stop the engine in case of
a turnover. To start the engine after a
turnover, be sure to turn the main
switch to “OFF” and then to “ON”. Fail-
ing to do so will prevent the engine
from starting even though the engine
will crank when pushing the start
switch.
EAUU1950
Startin g the en gineNOTICE
ECA10251
See pag e 5-4 for en gine break-in in-
structions prior to operatin g the ve-
hicle for the first time.In order for the ignition circuit cut-off
system to enable starting, the side-
stand must be up.
See page 3-18 for more information. 1. Turn the key to “ON”. The following warning lights
should come on for a few sec-
onds, then go off. Engine trouble warning light
Coolant temperature warning
lightNOTICE
ECA15485
If a warnin g li ght does not come on
initially when the key is turne d to
“ON”, or if a warnin g lig ht remains
on, see pa ge 3-3 for the correspon d-
in g warnin g lig ht circuit check.
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Operation and important rid ing points
5-4
5
EAU16831
En gine break-inThere is never a more important period
in the life of your engine than the period
between 0 and 1000 km (600 mi). For
this reason, you should read the fol-
lowing material carefully.
Since the engine is brand new, do not
put an excessive load on it for the first
1000 km (600 mi). The various parts in
the engine wear and polish themselves
to the correct operating clearances.
During this period, prolonged full-throt-
tle operation or any condition that
might result in engine overheating
must be avoided.
EAU61040
0–150 km (0–90 mi)
Avoid prolonged operation above 1/3
throttle.
After every hour of operation, stop the
engine, and then let it cool for five to
ten minutes.
Vary the engine speed from time to
time. Do not operate the engine at one
set throttle position. 150–500 km (90–300 mi)
Avoid prolonged operation above 1/2
throttle.
Rev the engine freely through the
gears, but do not use full throttle at any
time.
500–1000 km (300–600 mi)
Avoid prolonged operation above 3/4
throttle.
1000 km (600 mi) an
d b eyon d
Avoid prolonged full-throttle operation.
Vary the engine speed occasionally.
NOTICE: After 1000 km (600 mi) of
operation, be sure to chan ge the en-
g ine oil an d final transmission oil,
an d to clean the oil strainer.
[ECA16502]
NOTICE
ECA10271
If any en gine trou ble shoul d occur
d uring the en gine break-in perio d,
imme diately have a Yamaha dealer
check the vehicle.
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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Periodic maintenance an d a djustment
6-27
6
battery tends to discharge more quick-
ly if the vehicle is equipped with op-
tional electrical accessories.
NOTICE
ECA16522
To char
ge a VRLA (Valve Re gulate d
Lea d Aci d) battery, a special (con-
stant-voltag e) battery char ger is re-
quire d. Usin g a conventional b attery
char ger will d amage the battery.To store the battery
1. If the vehicle will not be used for more than one month, remove the
battery, fully charge it, and then
place it in a cool, dry place.
NOTICE: When removin g the
b attery, be sure the key is
turne d to “OFF”, then discon-
nect the neg ative lead b efore
d isconnectin g the positive lea d.
[ECA16303]
2. If the battery will be stored for
more than two months, check it at
least once a month and fully
charge it if necessary.
3. Fully charge the battery before in- stallation. NOTICE: When install-
in g the b attery, be sure the key is turne
d to “OFF”, then connect
the positive lea d before con-
nectin g the ne gative lead .
[ECA16841]
4. After installation, make sure that
the battery leads are properly con-
nected to the battery terminals.NOTICE
ECA16531
Always keep the b attery charged .
Storin g a dischar ged battery can
cause permanent b attery damag e.
EAU60984
Replacin g the fusesThe main fuse and the fuse box, which
contains the fuses for the individual cir-
cuits, are located under the seat. (See
page 3-15.)1. Fuse box
2. Spare main fuse
3. Main fuse
1
2
3
U2CME2E0.book Page 27 Friday, August 21, 2015 9:16 AM

Periodic maintenance an d a djustment
6-28
6 MW125 MW125A
If a fuse is blown, replace it as follows.1. Turn the key to “OFF” and turn off the electrical circuit in question.
2. Open the seat. (See page 3-15.)
3. Remove the fuse box cover as shown. 4. Remove the blown fuse, and then
install a new fuse of the specified
amperage. WARNING! Do not
use a fuse of a hi gher ampera ge
ratin g than recommen ded to
avoi d causin g extensive d am-
a g e to the electrical system an d
possi bly a fire.
[EWA15132]
1. Backup fuse (for clock)
2. Signaling system fuse
3. Headlight fuse
4. Spare fuse
123
4
1. Backup fuse (for clock)
2. Signaling system fuse
3. Headlight fuse
4. ABS control unit fuse
5. ABS motor fuse
6. ABS solenoid fuse
7. Spare fuse
12345
6
7
1. Fuse box cover
1
U2CME2E0.book Page 28 Friday, August 21, 2015 9:16 AM

Periodic maintenance an d a djustment
6-29
6
5. Turn the key to “ON” and turn on the electrical circuit in question to
check if the device operates.
6. If the fuse immediately blows again, have a Yamaha dealer
check the electrical system.
7. Install the fuse box cover, and then close the seat.
EAU23765
Replacin g the hea dlig ht bul bThis model is equipped with a halogen
bulb headlight. If the headlight bulb
burns out, replace it as follows.NOTICE
ECA10651
Take care not to damag e the follow-
in g parts:
Hea dlig ht bul b
Do not touch the glass part of
the hea dlig ht bul b to keep it free
from oil, otherwise the transpar-
ency of the g lass, the luminosity
of the b ulb, an d the b ulb life will
b e ad versely affected . Thor-
ou ghly clean off any d irt and fin-
g erprints on the hea dlig ht bul b
using a cloth moistene d with al-
cohol or thinner.
Hea dlig ht lens
Do not affix any type of tinted
film or stickers to the head light
lens.
Do not use a hea dlig ht bul b of a
watta ge hi gher than specifie d.
1. Disconnect the headlight coupler,
and then remove the headlight
bulb cover.
2. Unhook the headlight bulb holder, and then remove the burnt-out
bulb.
Specifie d fuses:
Main fuse:
20.0 A
Headlight fuse:
15.0 A (MW125)
20.0 A (MW125A)
Signaling system fuse:
10.0 A
ABS motor fuse: 30.0 A (MW125A)
ABS solenoid fuse: 20.0 A (MW125A)
ABS control unit fuse:
10.0 A (MW125A)
Backup fuse: 10.0 A
1. Do not touch the glass part of the bulb.
1. Headlight coupler
2. Headlight bulb cover
12
U2CME2E0.book Page 29 Friday, August 21, 2015 9:16 AM

10-1
10
Index
AABS (for ABS models) .......................... 3-11
ABS warning light (for ABS models) ....... 3-4
Acceleration and deceleration ................ 5-3
Air filter and V-belt case air filter
elements ............................................. 6-14
Auxiliary DC connector ......................... 3-20
Auxiliary lights....................................... 6-30BBattery .................................................. 6-26
Brake fluid, changing............................ 6-22
Brake fluid level, checking.................... 6-20
Brake lever, front .................................. 3-10
Brake lever, rear ................................... 3-10
Brake levers, lubricating ....................... 6-23
Braking ................................................... 5-3CCables, checking and lubricating ......... 6-22
Care ........................................................ 7-1
Catalytic converter ............................... 3-14
Centerstand and sidestand, checking and lubricating .................... 6-23
Coolant ................................................. 6-13
Coolant temperature warning light ......... 3-4DDimmer switch...................................... 3-10EEngine break-in ...................................... 5-4
Engine oil and oil strainer ..................... 6-10
Engine serial number .............................. 9-1
Engine trouble warning light ................... 3-4FFinal transmission oil ............................ 6-12
Front and rear brake pads, checking ... 6-20 Front brake lever free play, checking ... 6-19
Front fork, checking ............................. 6-24
Fuel ...................................................... 3-13
Fuel consumption, tips for reducing ...... 5-3
Fuel tank cap........................................ 3-12
Fuses, replacing ................................... 6-27
HHandlebar switches ............................... 3-9
Headlight bulb, replacing ..................... 6-29
High beam indicator light ....................... 3-4
Horn switch .......................................... 3-10IIdentification numbers ........................... 9-1
Ignition circuit cut-off system .............. 3-18
Indicator lights and warning lights ......... 3-3KKeyhole shutter ...................................... 3-3LLeaning system, checking ................... 6-26
Luggage hook ...................................... 3-17MMain 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 ........................ 3-5PPanel, removing and installing ............... 6-8
Parking ................................................... 5-4
Part locations ......................................... 2-1
Passenger footrest ............................... 3-15
RRear brake lever free play, checking .... 6-19SSafe-riding points ................................... 1-5
Safety information................................... 1-1
Seat....................................................... 3-15
Self-diagnosis device ............................. 3-5
Sidestand.............................................. 3-17
Spark plug, checking .............................. 6-8
Specifications ......................................... 8-1
Starting off .............................................. 5-2
Starting the engine ................................. 5-1
Start switch ........................................... 3-10
Steering, checking ................................ 6-25
Steering tie rod, checking..................... 6-25
Storage ................................................... 7-4
Storage compartment........................... 3-16TTail/brake light ...................................... 6-30
Throttle grip and cable,
checking and lubricating .................... 6-22
Throttle grip free play, checking ........... 6-16
Tires ...................................................... 6-17
Tool kit .................................................... 6-2
Troubleshooting .................................... 6-31
Troubleshooting charts ......................... 6-32
Turn signal indicator lights...................... 3-3
Turn signal light bulb ............................ 6-31
Turn signal switch ................................. 3-10VValve clearance..................................... 6-16
Vehicle identification number ................. 9-1
U2CME2E0.book Page 1 Friday, August 21, 2015 9:16 AM