2003 YAMAHA TMAX spark plugs replace

6-3
PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU03685
Periodic maintenance and lubrication chartPeriodic maintenance and lubrication chart
NOTE:
8 8
The annual checks must be performed every year, except if a kilometer-based maintenance is performed instead.
8From 50,000 km, repeat the maintenance intervals starting from 10,000 km.
8Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools, data and
technical skills.
NO. ITEM CHECK OR MAINTENANCE JOBODOMETER READING (× 1,000 km)
ANNUAL
CHECK
1 10203040
1
*Fuel line•Check fuel hoses and vacuum hose for cracks or damage.√√√√ √
2
*Fuel filter•Check condition.√√
3 Spark plugs•Check condition.
•Clean and regap.√√
•Replace.√√
4
*Valves•Check valve clearance.
•Adjust.Every 40,000 km
5 Air filter element•Clean.√√
•Replace.√√
6
*V-belt case air filter
elements•Clean.√√
•Replace.√√
7
*Front brake•Check operation, fluid level and vehicle for fluid leakage.
(See NOTE on page 6-5.)√√√√√ √
•Replace brake pads.Whenever worn to the limit
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6-11
PERIODIC MAINTENANCE AND MINOR REPAIR
6To check the spark plugs
1. Check that the porcelain insula-
tor around the center electrode
on each spark plug is a medium-
to-light tan (the ideal color when
the scooter is ridden normally).
2. Check that all spark plugs
installed in the engine have the
same color.
NOTE:
If any spark plug shows a distinctly
different color, the engine could be
defective. Do not attempt to diagnose
such problems yourself. Instead,
have a Yamaha dealer check the
scooter.
3. Check each spark plug for elec-
trode erosion and excessive car-
bon or other deposits, and
replace it if necessary.
NOTE:
If a torque wrench is not available
when installing a spark plug, a good
estimate of the correct torque is
1/4–1/2 turn past finger tight.
However, the spark plug should be
tightened to the specified torque as
soon as possible.
4. Install the spark plug cap. To install a spark plug
1. Measure the spark plug gap with
a wire thickness gauge and, if
necessary, adjust the gap to
specification.
2. Clean the surface of the spark
plug gasket and its mating sur-
face, and then wipe off any grime
from the spark plug threads.
3. Install the spark plug with the
spark plug wrench, and then
tighten it to the specified torque.
a
a. Spark plug gap
Specified spark plug:
CR7E (NGK)
Spark plug gap:
0.7–0.8 mm
Tightening torque:
Spark plug:
12.5 Nm (1.25 m·kgf)
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PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU02990
Troubleshooting chartsTroubleshooting charts
Starting problems or poor engine performanceEW000125
w
Keep away open flames and do not smoke while checking or working on the fuel system.
Check the fuel level in
the fuel tank.
1. FuelThere is enough fuel.
There is no fuel.Check the compression.
Supply fuel.
The engine does not start.
Check the compression.
Operate the electric starter.
2. CompressionThere is compression.
There is no compression.Check the ignition.
Have a Yamaha dealer
check the vehicle.
Remove the spark plugs
and check the electrodes.
3. IgnitionWipe off with a dry cloth and correct the
spark plug gaps, or replace the spark plugs.
Have a Yamaha dealer check the vehicle.
The engine does not start.
Have a Yamaha dealer
check the vehicle.
The engine does not start.
Check the battery.
Operate the electric starter.
4. BatteryThe engine turns over
quickly.
The engine turns over
slowly.The battery is good.
Check the battery lead connections,
and charge the battery if necessary.
Dry
WetOpen the throttle halfway and operate
the electric starter.
5GJ-28199-E2 9/9/02 9:15 AM Page 80

INDEX
F
Front and rear brake levers ..................6-25
Front and rear brake pads, checking ....6-26
Front fork, checking ..............................6-30
Fuel ......................................................3-10
Fuel consumption, tips for reducing .......5-3
Fuel gauge .............................................3-4
Fuel tank cap ..........................................3-9
Fuses, replacing ...................................6-34
H
Handlebar switches ................................3-6
Dimmer switch .....................................3-6
Engine stop switch ...............................3-7
Hazard switch ......................................3-7
Horn switch ..........................................3-7
Pass switch ..........................................3-6
Start switch ..........................................3-7
Turn signal switch ................................3-7
Headlight bulb, replacing ......................6-35
Headlight variations ................................3-8
Helmet holder .......................................3-13
I
Identification numbers ............................9-1
Ignition circuit cut-off system ................3-15
Indicator lights ........................................3-2
High beam indicator light .....................3-3
Oil change indicator light .....................3-2
Turn signal indicator lights ...................3-3
V-belt replacement indicator light ........3-3K
Key identification number .......................9-1
M
Main switch/steering lock .......................3-1
Model label .............................................9-2
P
Parking ...................................................5-4
Part locations ..........................................2-1
Periodic maintenance and lubrication
chart .....................................................6-3
Pre-operation check list ..........................4-1
R
Rider backrest, adjusting ......................3-12
S
Safe-riding points ...................................1-2
Seat ......................................................3-11
Self-diagnosis device .............................3-6
Sidestand .............................................3-14
Spark plugs, checking ............................6-9
Specifications .........................................8-1
Speedometer unit ...................................3-4
Starting off ..............................................5-2
Starting the engine .................................5-1
Steering, checking ................................6-31
Storage ...................................................7-4
Storage compartments .........................3-14A
Acceleration and deceleration ................5-2
Air filter element, cleaning ....................6-19
Anti-theft alarm (optional) .......................3-6
B
Battery ..................................................6-32
Brake fluid level, checking ....................6-27
Brake fluid, changing ............................6-28
Brake lever, front ....................................3-9
Brake lever, rear .....................................3-9
Brake levers, lubricating .......................6-29
Braking ...................................................5-3
C
Carburetors, adjusting ..........................6-21
Care ........................................................7-1
Centerstand and sidestand, checking and
lubricating ..........................................6-29
Chain drive oil .......................................6-15
Clock ......................................................3-5
Conversion table ....................................8-5
Coolant ..................................................6-17
Coolant temperature gauge ....................3-5
Cowlings and panels, removing and
installing ...............................................6-6
E
Engine break-in ......................................5-4
Engine idling speed ..............................6-21
Engine oil and oil filter cartridge ...........6-12
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