2021 YAMAHA TMAX check engine

Periodic maintenance an d a djustment
8-19
8
EAU21386
Checkin g the throttle grip free
playMeasure 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 clearanceThe 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.TIPThis service must be performed when
the engine is cold.
EAU77621
TiresTires are the only contact between the
vehicle and the road. Safety in all con-
ditions of riding depends on a relatively
small area of road contact. Therefore, it
is essential to maintain the tires in good
condition at all times and replace them
at the appropriate time with the speci-
fied tires.
Tire air pressure
The tire air pressure should be
checked and, if necessary, adjusted
before each ride.
WARNING
EWA10504
Operation of this vehicle with im-
proper tire pressure may cause se-
vere injury or death from loss of
control.  The tire air pressure must be
checked and a djuste d on col d
tires (i.e., when the temperature
of the tires equals the amb ient
temperature).
 The tire air pressure must be
a d juste d in accor dance with the
ri din g speed and with the total
1. Throttle grip free playThrottle g rip free play:
1.0–3.0 mm (0.04–0.12 in)
1
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Periodic maintenance an d a djustment
8-36
8
If the smart key system does not work
after checking the above items, have a
Yamaha dealer check the smart key system.
TIPSee Emergency mode on page 8-39
for information on starting the engine
without the smart key.
UB3TE1E0.book Page 36 Friday, September 11, 2020 8:48 AM

Periodic maintenance an d a djustment
8-37
8
EAU86350
Trou bleshootin g chart
Check the fuel level in
the fuel tank.1. Fuel
There is enough fuel.
There is no fuel.
Check the battery.
Supply fuel.
The engine does not start.
Check the battery.
Try starting the engine.4. Compression
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.
Remove the spark plug
and check the electrodes.3. Ignition
Wipe off with a dry cloth and correct the
spark plug gap, or replace the spark plug(s). Have a Yamaha dealer check the vehicle.
The engine does not start.
Check the compression.
Operate the electric starter.2. Battery
The engine turns over
quickly.
The engine turns over
slowly.
The battery is good.
DryWet
Try starting the engine.
Check the battery lead connections,
and charge the battery if necessary.
The engine does not start.
Check the ignition.
UB3TE1E0.book Page 37 Friday, September 11, 2020 8:48 AM

Periodic maintenance an d a djustment
8-38
8
EAU86420
En gine overheatin g
WARNING
EWAT1041
Do not remove the ra diator cap when the en gine an d ra diator are hot. Scal din g hot flui d an d steam may be
b lown out un der pressure, which coul d cause serious injury. Be sure to wait until the en gine has coole d.
 Place a thick rag , like a towel, over the ra diator cap, an d then slowly rotate the cap counterclockwise to the
d etent to allow any resi dual pressure to escape. When the hissin g soun d has stopped , press down on the cap
while turnin g it counterclockwise, an d then remove the cap.TIPIf coolant is not available, tap water can be temporarily used instead, provided that it is changed to the recommended cool-
ant as soon as possible.
Wait until the
engine has cooled.
Check the coolant level in the
reservoir and radiator.
The coolant level
is OK.The coolant level is low.
Check the cooling system
for leakage.
Have a Yamaha dealer checkand repair the cooling system.Add coolant. (See TIP.)
Start the engine. If the engine overheats again,
have a
Yamaha dealer check
and repair the cooling system.
There is
leakage.
There is
no leakage.
UB3TE1E0.book Page 38 Friday, September 11, 2020 8:48 AM

Scooter care and storage
9-4
9
1. Make all necessary repairs and
perform any outstanding mainte-
nance.
2. Follow all instructions in the Care section of this chapter.
3. Fill up the fuel tank, adding fuel stabilizer according to product in-
structions. Run the engine for 5
minutes to distribute treated fuel
through the fuel system.
4. For vehicles equipped with a fuel cock: Turn the fuel cock lever to
the off position.
5. For vehicles with a carburetor: To prevent fuel deposits from build-
ing up, drain the fuel in the carbu-
retor float chamber into a clean
container. Retighten the drain bolt
and pour the fuel back into the fuel
tank.
6. Use a quality engine fogging oil according to product instructions
to protect internal engine compo-
nents from corrosion. If engine
fogging oil is not available, per-
form the following steps for each
cylinder:a. Remove the spark plug cap and spark plug. b. Pour a teaspoonful of engine
oil into the spark plug bore.
c. Install the spark plug cap onto the spark plug, and then place
the spark plug on the cylinder
head so that the electrodes are
grounded. (This will limit spark-
ing during the next step.)
d. Turn the engine over several times with the starter. (This will
coat the cylinder wall with oil.)
WARNING! To prevent dam-
a g e or injury from sparkin g,
make sure to groun d the
spark plu g electro des while
turnin g the en gine over.
[EWA10952]
e. Remove the spark plug cap
from the spark plug, and then
install the spark plug and the
spark plug cap.
7. Lubricate all control cables, piv- ots, levers and pedals, as well as
the sidestand and centerstand (if
equipped).
8. Check and correct the tire air pressure, and then lift the vehicle
so that all wheels are off the
ground. Otherwise, turn the wheels a little once a month in or-
der to prevent the tires from be-
coming degraded in one spot.
9. Cover the muffler outlet with a plastic bag to prevent moisture
from entering it.
10. Remove the battery and fully charge it, or attach a maintenance
charger to keep the battery opti-
mally charged. NOTICE: Confirm
that the battery an d its char ger
are compati ble. Do not char ge a
VRLA battery with a convention-
al char ger.
[ECA26330]
TIP If the battery will be removed,
charge it once a month and store
it in a temperate location between
0-30 °C (32-90 °F).
 See page 8-30 for more informa-
tion on charging and storing the
battery.
UB3TE1E0.book Page 4 Friday, September 11, 2020 8:48 AM

Consumer information
11-2
11
The model label is affixed to the inside
of the rear storage compartment. (See
page 5-23.) Record the information on
this label in the space provided. This
information will be needed when order-
ing spare parts from a Yamaha dealer.
EAU69910
Dia
gnostic connectorThe diagnostic connector is located as
shown.
EAU85300
Vehicle data recor din gThis 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
1. Diagnostic connector
1
https://www.yamaha-motor.eu/eu/
privacy/privacy-policy.aspx
UB3TE1E0.book Page 2 Friday, September 11, 2020 8:48 AM

12-1
12
Index
AABS warning light ................................... 5-3
Acceleration and deceleration ................ 7-3
Air filter element and check hose,
replacing and cleaning ....................... 8-17
Air filter element, V-belt ........................ 8-18
Anti-lock brake system (ABS)............... 5-19
Auxiliary DC jack .................................. 5-26BBattery .................................................. 8-30
Brake fluid, changing............................ 8-26
Brake fluid level, checking.................... 8-25
Brake lever, front .................................. 5-17
Brake lever, rear ................................... 5-18
Brake levers, lubricating ....................... 8-28
Braking ................................................... 7-3CCables, checking and lubricating ......... 8-27
Canister ................................................ 8-12
Care ........................................................ 9-1
Catalytic converter ............................... 5-22
Centerstand and sidestand, checking and lubricating ................................... 8-28
Coolant ................................................. 8-15
Cruise control indicator lights................. 5-3
Cruise control switches .......................... 5-2
Cruise control system............................. 4-1DData recording, vehicle......................... 11-2
Diagnostic connector ........................... 11-2
Dimmer/Pass switch............................... 5-1
D-mode (drive mode).............................. 4-3
Drive belt .............................................. 8-26
Drive mode switch .................................. 5-2
EEmergency mode ................................. 8-39
Engine break-in ...................................... 7-1
Engine idling speed, checking ............. 8-18
Engine oil and oil filter cartridge........... 8-12
Engine overheating .............................. 8-38
Engine serial number ........................... 11-1
Engine stop switch................................. 5-2FFront and rear brake lever free play, checking ............................................ 8-22
Front and rear brake pads, checking ... 8-24
Front fork, checking ............................. 8-29
Fuel ...................................................... 5-20
Fuel consumption, tips for reducing ...... 7-4
Fuel tank cap........................................ 5-20
Fuel tank overflow hose ....................... 5-22
Fuses, replacing ................................... 8-32HHandlebar switches ............................... 5-1
Hazard switch ........................................ 5-2
High beam indicator light ....................... 5-3
Horn switch ............................................ 5-1
How to lock the centerstand ................ 3-10
How to lock the steering ........................ 3-9IIdentification numbers ......................... 11-1
Ignition circuit cut-off system .............. 5-28
Indicator lights and warning lights ......... 5-2KKey, handling of smart and mechanical key ....................................................... 3-3LLicense plate light bulb, replacing ....... 8-34
MMaintenance and lubrication, periodic ... 8-5
Maintenance, emission control system .................................................. 8-3
Malfunction indicator light (MIL) ............. 5-3
Matte color, caution................................ 9-1
Menu switch ........................................... 5-2
Model label ........................................... 11-1
Multi-function display ............................. 5-5OOperating range of the smart key system .................................................. 3-2PPanels, removing and installing .............. 8-9
Parking.................................................... 7-4
Parking mode ....................................... 3-13
Part locations.......................................... 2-1
Powering off the vehicle ......................... 3-8
Powering on the vehicle ......................... 3-7
Power on/Starter switch ......................... 5-2RRear brake lock cable, adjusting .......... 8-23
Rear brake lock, checking .................... 8-23
Rear brake lock lever ............................ 5-18
Rear view mirrors .................................. 5-24SSafe-riding points ................................... 1-5
Safety information................................... 1-1
Select switch .......................................... 5-2
Shock absorber assembly .................... 5-25
Sidestand.............................................. 5-27
Smart key................................................ 3-5
Smart key battery, replacing................... 3-6
Smart key system ................................... 3-1
UB3TE1E0.book Page 1 Friday, September 11, 2020 8:48 AM

Index
12-2
12
Smart key system indicator light ............ 5-4
Smart key system, troubleshooting ...... 8-35
Spark plugs, checking .......................... 8-11
Special features ...................................... 4-1
Specifications ....................................... 10-1
Speedometer .......................................... 5-4
Starting off .............................................. 7-3
Starting the engine.................................. 7-2
Steering, checking ................................ 8-30
Storage ................................................... 9-3
Storage compartment and fuel tank
access ................................................ 3-11
Storage compartments ......................... 5-23TTachometer ............................................. 5-5
Throttle grip and cable, checking and
lubricating ........................................... 8-27
Throttle grip free play, checking ........... 8-19
Tires ...................................................... 8-19
Tool kit .................................................... 8-2
Traction control system .......................... 4-4
Traction control system indicator light ... 5-4
Troubleshooting .................................... 8-35
Troubleshooting chart........................... 8-37
Turn signal indicator lights ...................... 5-2
Turn signal switch ................................... 5-1VValve clearance..................................... 8-19
Vehicle identification number ............... 11-1
Vehicle lights ......................................... 8-34WWheel bearings, checking..................... 8-30
Wheels .................................................. 8-21
YYamalube ............................................. 8-15
UB3TE1E0.book Page 2 Friday, September 11, 2020 8:48 AM