check engine YAMAHA MT-03 2020 Owner's Manual

Periodic maintenance and adjustment
6-15
6
EAU21386
Checking the throttle grip free
play
Measure the throttle grip free play as
shown.
Periodically check the throttle grip free
play and, if necessary, have a Yamaha
dealer adjust it.
EAU21403
Valve clearance
The valves are an important engine
component, and since valve clearance
changes with use, they must be
checked and adjusted at the intervals
specified in the periodic maintenance
chart. Unadjusted valves can result in
improper air-fuel mixture, engine
noise, and eventually engine damage.
To prevent this from occurring, have
your Yamaha dealer check and adjust
the valve clearance at regular intervals.
TIP
This service must be performed when
the engine is cold.1. Throttle grip free play
Throttle grip free play:
3.0–5.0 mm (0.12–0.20 in)
1
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Periodic maintenance and adjustment
6-23
6
EAU22762
Drive chain slack
The drive chain slack should be
checked before each ride and adjusted
if necessary.
EAU74253To check the drive chain slack
1. Place the motorcycle on the side-
stand.
TIP
When checking and adjusting the drive
chain slack, there should be no weight
on the motorcycle.
2. Shift the transmission into the
neutral position.
3. Measure the drive chain slack as
shown.
4. If the drive chain slack is incorrect,
adjust it as follows. NOTICE: Im-
proper drive chain slack will
overload the engine as well as
other vital parts of the motorcy-
cle and can lead to chain slip-
page or breakage. To prevent
this from occurring, keep the
drive chain slack within the
specified limits.
[ECA10572]EAU62983
To adjust the drive chain slack
Consult a Yamaha dealer before ad-
justing the drive chain slack.
1. Remove the drive chain puller cap,
and then loosen the axle nut and
the locknut on each side of the
swingarm.
2. To tighten the drive chain, turn the
drive chain slack adjusting nut on
each side of the swingarm in di-
rection (a). To loosen the drive
chain, turn the adjusting nut on
each side of the swingarm in di-
rection (b), and then push the rear
wheel forward.
1. Drive chain slack
Drive chain slack:
35.0–45.0 mm (1.38–1.77 in)
1
1. Axle nut
2. Locknut
3. Drive chain puller cap
1. Drive chain slack adjusting nut
2
3
1
1(a)
(b)
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Periodic maintenance and adjustment
6-34
65. Insert a new bulb into the socket.
6. Install the socket (together with
the bulb) by pushing it in.
7. Install the rear fender lower panel
by installing the bolts and screws.
8. Install the mudguard by installing
the quick fasteners.
EAU24351
Supporting the motorcycle
Since this model is not equipped with a
centerstand, follow these precautions
when removing the front and rear
wheel or performing other mainte-
nance requiring the motorcycle to
stand upright. Check that the motorcy-
cle is in a stable and level position be-
fore starting any maintenance. A
strong wooden box can be placed un-
der the engine for added stability.
To service the front wheel
1. Stabilize the rear of the motorcy-
cle by using a motorcycle stand
or, if an additional motorcycle
stand is not available, by placing a
jack under the frame in front of the
rear wheel.
2. Raise the front wheel off the
ground by using a motorcycle
stand.
To service the rear wheel
Raise the rear wheel off the ground by
using a motorcycle stand or, if a motor-
cycle stand is not available, by placing
a jack either under each side of the
frame in front of the rear wheel or under
each side of the swingarm.
1. License plate light bulb
2. License plate light bulb socket
2
1
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Periodic maintenance and adjustment
6-36
6
EAU86390
Troubleshooting chart
1. FuelThere is enough fuel.
There is no fuel.
Check the battery.
Supply fuel.
The engine turns over
quickly.
The engine turns over
slowly.
Try starting the
engine.
The engine does not
start.
Check the battery.
Wipe off with a dry
cloth and correct the
spark plug gap, or
replace the spark
plug(s).
Check the battery
lead connections,
and charge the
battery if necessary.
2. BatteryThe battery is good.
The engine does not
start.
Check the ignition.
3. IgnitionWet
Dry
There is compression.
There is no
compression.
The engine does not start.
Have a Yamaha dealer check the vehicle.
Have a Yamaha dealer check the vehicle.
The engine does not
start.
Check the
compression.Have a Yamaha
dealer check the
vehicle.
Remove the spark
plug and check
the electrodes.
Operate the electric
starter.
Try starting the
engine.
Check the fuel level
in the fuel tank.
4. Compression
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Periodic maintenance and adjustment
6-37
6
EAU86430Engine overheating
WARNING
EWAT1041
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.
Place a thick rag, like a towel, over the radiator cap, and then slowly ro-
tate the cap counterclockwise to the detent to allow any residual pres-
sure to escape. When the hissing sound has stopped, press down on the
cap while turning it counterclockwise, and then remove the cap.
TIP
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.Add coolant.
(See TIP.)
The coolant level is
OK.
There is no leakage.
There is leakage.
The coolant level is
low.
Check the cooling
system for 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.
UB6WE0E0.book Page 37 Friday, March 27, 2020 11:37 AM

Consumer information
9-2
9
EAU69910
Diagnostic connector
The diagnostic connector is located as
shown.
EAU85300
Vehicle data recording
This model’s ECU stores certain vehi-
cle data to assist in the diagnosis of
malfunctions and for research, statisti-
cal analysis and development purpos-
es.
Although the sensors and recorded
data will vary by model, the main data
points are:
Vehicle status and engine perfor-
mance data
Fuel-injection and emission-relat-
ed data
This data will be uploaded only when a
special Yamaha diagnostic tool is at-
tached to the vehicle, such as when
maintenance checks or service proce-
dures are performed.
Vehicle data uploaded will be handled
appropriately according to the follow-
ing Privacy Policy.
Privacy Policy
Yamaha will not disclose this data to a
third party except in the following cas-
es. In addition, Yamaha may provide
vehicle data to a contractor in order to
outsource services related to the han-
dling of vehicle data. Even in this case,
Yamaha will require the contractor to
properly handle the vehicle data we
provided and Yamaha will appropriate-
ly manage the data.
With the consent of the vehicle
owner
Where obligated by law
For use by Yamaha in litigation
When the data is not related to an
individual vehicle nor owner
1. FI diagnostic connector
1
https://www.yamaha-motor.eu/eu/
privacy/privacy-policy.aspx
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10-1
10
Index
A
ABS ...................................................... 3-13
ABS warning light ................................... 3-3
Air filter element and check hose,
replacing and cleaning ....................... 6-13
B
Battery .................................................. 6-29
Brake and clutch levers,
checking and lubricating .................... 6-26
Brake and shift pedals,
checking and lubricating .................... 6-26
Brake fluid, changing ........................... 6-22
Brake fluid level, checking ................... 6-21
Brake lever ........................................... 3-12
Brake lever free play, checking ............ 6-19
Brake light switches ............................. 6-20
Brake pedal .......................................... 3-13
C
Cables, checking and lubricating ......... 6-25
Canister .................................................. 6-8
Care ........................................................ 7-1
Catalytic converter ............................... 3-17
Clock ...................................................... 3-5
Clutch lever .......................................... 3-11
Clutch lever free play, adjusting ........... 6-18
Coolant ................................................. 6-12
Coolant temperature meter .................... 3-5
D
Data recording, vehicle .......................... 9-2
Diagnostic connector ............................. 9-2
Dimmer switch ..................................... 3-10
Display units, switching.......................... 3-4
Drive chain, cleaning and lubricating ... 6-24
Drive chain slack .................................. 6-23
E
Engine break-in ...................................... 5-1
Engine oil and oil filter cartridge ............. 6-8
Engine overheating............................... 6-37
Engine serial number.............................. 9-1
Engine trouble warning light................... 3-3
F
Front and rear brake pads, checking ... 6-20
Front fork, checking ............................. 6-28
Fuel....................................................... 3-15
Fuel consumption, tips for reducing ...... 5-4
Fuel meter .............................................. 3-4
Fuel tank cap........................................ 3-14
Fuel tank overflow hose ....................... 3-16
Fuses, replacing ................................... 6-31
H
Handlebar switches .............................. 3-10
Hazard switch ....................................... 3-10
Helmet holders...................................... 3-19
High beam indicator light........................ 3-2
Horn switch........................................... 3-10
I
Identification numbers ............................ 9-1
Ignition circuit cut-off system ............... 3-22
Indicator lights and warning lights .......... 3-2
L
License plate light bulb, replacing ........ 6-33
Luggage strap holders .......................... 3-21
M
Main 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 display ............................. 3-6
Multi-function meter unit ........................ 3-4
N
Neutral indicator light.............................. 3-2
O
Oil pressure warning light ....................... 3-2
P
Parking .................................................... 5-5
Part locations .......................................... 2-1
Pass switch........................................... 3-10
S
Safety information................................... 1-1
Seats ..................................................... 3-17
Shift indicator light .................................. 3-3
Shift indicator light control mode ........... 3-8
Shifting .................................................... 5-3
Shift pedal............................................. 3-12
Shock absorber assembly, adjusting ... 3-20
Sidestand .............................................. 3-22
Sidestand, checking and lubricating .... 6-27
Spark plugs, checking ............................ 6-7
Specifications ......................................... 8-1
Speedometer .......................................... 3-4
Start/Engine stop switch ...................... 3-10
Starting the engine.................................. 5-2
Steering, checking ................................ 6-28
Storage ................................................... 7-4
Storage compartment ........................... 3-20
Supporting the motorcycle ................... 6-34
Swingarm pivots, lubricating ................ 6-27
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