2012 YAMAHA MT-03 maintenance

PERIODIC MAINTENANCE AND MINOR REPAIR
6-38
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EAU25080
Rear wheelEAU25311
To remove the rear wheelEWA10820
WARNING0
●It is advisable to have a Yama-
ha dealer service the wheel.
●Securely support the motorcy-
cle so that there is no danger of
it falling over.
1. Wheel axle nut
2. Drive chain slack adjusting bolt
3. Locknut
4. Drive chain
1. Wheel axle
2. Brake caliper bracket
1. Loosen the axle nut.
2. Lift the rear wheel off the ground
according to the procedure on
page 6-36.
3. Remove the axle nut.
4. Loosen the locknut on each side
of the swingarm.
5. Turn the drive chain slack adjust-
ing bolts fully in direction (a) and
push the wheel forward.
6. Remove the drive chain from the
rear sprocket.
4. Install the brake calipers by in-
stalling the bolts.
NOTE:
Make sure that there is enough space
between the brake pads before in-
stalling the brake calipers onto the
brake discs.
5. Install the brake hose holders by
installing the bolts.
6. Tighten the wheel axle, the front
wheel axle pinch bolt and the
brake caliper bolts to the speci-
fied torques.
Tightening torques:
Wheel axle:
72 Nm (7.2 m·kgf, 52 ft·lbf)
Front wheel axle pinch bolt:
14 Nm (1.4 m·kgf, 10 ft·lbf)
Brake caliper bolt:
40 Nm (4.0 m·kgf, 29 ft·lbf)
7. Push down hard on the handlebar
several times to check for proper
fork operation.

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PERIODIC MAINTENANCE AND MINOR REPAIR
6-39
NOTE:
●If the drive chain is difficult to re-
move, remove the wheel axle first,
and then lift the wheel upward
enough to remove the drive chain
from the rear sprocket.
●The drive chain cannot be disas-
sembled.
7. While supporting the brake
caliper bracket, pull the wheel
axle out, and then remove the
wheel.
ECA11070CAUTION:
Do not apply the brake after the
wheel has been removed together
with the brake disc, otherwise the
brake pads will be forced shut.
EAU34430
To install the rear wheel
1. Install the wheel and the brake
caliper bracket by inserting the
wheel axle from the right-hand
side.
NOTE:
●Make sure that the retainer on the
swingarm is inserted into the slot
in the brake caliper bracket.
●Make sure that there is enough
space between the brake pads
before installing the wheel.
2. Install the drive chain onto the
rear sprocket.
3. Install the axle nut, and then low-
er the rear wheel so that it is on
the ground.
4. Adjust the drive chain slack. (See
page 6-23.)
5. Tighten the axle nut to the speci-
fied torque.
Tightening torque:
Axle nut:
150 Nm (15.0 m·kgf, 108 ft·lbf)
EAU25870
Troubleshooting
Although Yamaha motorcycles receive
a thorough inspection before shipment
from the factory, trouble may occur
during operation. Any problem in the
fuel, compression, or ignition systems,
for example, can cause poor starting
and loss of power.
The following troubleshooting charts
represent quick and easy procedures
for checking these vital systems your-
self. However, should your motorcycle
require any repair, take it to a Yamaha
dealer, whose skilled technicians have
the necessary tools, experience, and
know-how to service the motorcycle
properly.
Use only genuine Yamaha replace-
ment parts. Imitation parts may look
like Yamaha parts, but they are often
inferior, have a shorter service life and
can lead to expensive repair bills.

PERIODIC MAINTENANCE AND MINOR REPAIR
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EAU25921Troubleshooting charts
Starting problems or poor engine performance
WARNING0
Keep away open flames and do not smoke while checking or working on the fuel system.
1. Fuel
2. Compression
3. Ignition
4. Battery
Check the fuel level in the
fuel tank.
Operate the electric
starter.
Remove the spark plug
and check the electrodes.
Operate the electric
starter.
There is enough
fuel.
There is
compression.
Wet.
The engine turns
over quickly.
There is no fuel.
There is no
compression.
Dry.
The engine turns
over slowly.
Check the
compression.
Check the ignition.
Wipe off with a dry cloth and correct
the spark plug gap, or replace the
spark plug.
The battery is good.
Have a Yamaha dealer check the
vehicle.
Check the battery lead connections,
and charge the battery if necessary.
Open the throttle halfway and
operate the electric starter.
The engine does not start.
Check the battery.
The engine does
not start. Have a
Yamaha dealer
check the vehicle.
Supply fuel.
Have a Yamaha dealer check
the vehicle.
The engine does not start.
Check the compression.
6-40

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PERIODIC MAINTENANCE AND MINOR REPAIR
6-41
Engine overheatingEWA10400
WARNING0
●Do not remove the radiator cap when the engine and radiator are hot. Scalding hot fluid and steam may be
blown out under pressure, which could cause serious injury. Be sure to wait until the engine has cooled.
●After removing the radiator cap retaining bolt, place a thick rag, like a towel, over the radiator cap, and then
slowly rotate the cap counterclockwise to the detent to allow any residual pressure to escape. When the hiss-
ing sound has stopped, press down on the cap while turning it counterclockwise, and then remove the cap.
NOTE:
If coolant is not available, tap water can be temporarily used instead, provided that it is changed to the recommended
coolant as soon as possible.
Wait until the
engine has cooled.Check the coolant level
in the reservoir and radiator.
The coolant level is low.
Check the cooling
system for leakage.
The coolant level
is OK.
There is
leakage.
There is no
leakage.
Have a Yamaha dealer check
and repair the cooling system.
Start the engine. If the engine overheats again, have
a Yamaha dealer check and repair the cooling system.
Add coolant. (See NOTE.)

INDEX
1
2
3
4
5
6
7
8
9
10
Checking operation procedure .....3-20
Immobilizer system............................3-1
Immobilizer system indicator light ......3-3
Indicator and warning lights ...............3-4
Coolant temperature warning
light .................................................3-4
Engine trouble warning light ...........3-4
Fuel level warning light...................3-4
High beam indicator light ................3-4
Immobilizer system indicator light...3-3
Neutral indicator light......................3-4
Turn signal indicator light................3-4
Indicator lights brightness
control mode...................................3-8
Instruments ........................................2-3
Instrument and control functions ........3-1
K
Key identification number...................9-1
Keys ...................................................3-1
L
License plate light bulb, replacing....6-36
Lubricating the brake and
clutch levers ..................................6-26
Lubricating the brake pedal..............6-26
Lubricating the cables......................6-25
Lubricating the drive chain ...............6-24
Lubricating the sidestand .................6-27
Lubricating the throttle grip and
cable .............................................6-25M
Main switch/steering lock ...................3-2
Model label.........................................9-2
Multi-function meter unit.....................3-5
Clock mode .....................................3-7
Indicator lights brightness
control mode...................................3-8
Odometer, tripmeter modes ............3-6
Self-diagnosis devices....................3-7
Tachometer .....................................3-6
N
Neutral indicator light.........................3-4
O
Odometer, tripmeter modes ...............3-6
Oil filter element...............................6-10
Operation and important riding
points ..............................................5-1
Owner’s tool kit..................................6-1
P
Panels, removing and installing .........6-6
Parking...............................................5-4
Pass switch ........................................3-9
Periodic maintenance and
lubrication chart ..............................6-2
Periodic maintenance and minor
repair...............................................6-1
Pre-operation check list .....................4-2
Pre-operation checks.........................4-1R
Rear wheel.......................................6-38
Installing........................................6-38
Removing......................................6-38
Record the identification numbers .....9-1
S
Safety information..............................1-1
Seats ................................................3-14
Self-diagnosis devices.......................3-7
Shift pedal ........................................3-10
Shifting ...............................................5-2
Shock absorber assembly
(adjusting).....................................3-16
Side suspension, lubricating............6-27
Sidestand.........................................3-18
Sidestand, checking and
lubricating.....................................6-27
Sidestand switch, checking ..............3-20
Spark plug, checking..........................6-6
Specifications .....................................8-1
Start switch.........................................3-9
Starting the engine.............................5-1
Steering, checking............................6-28
Steering lock ......................................3-2
Storage...............................................7-3
Supporting the motorcycle ...............6-36
T
Tachometer ........................................3-6
Tail/brake light bulb, replacing..........6-34
Throttle cable free play, adjusting ....6-15