2003 YAMAHA TMAX engine overheat

3-5
EAU03124
Coolant temperature gaugeCoolant temperature gauge
This gauge indicates the coolant tem-
perature when the main switch is on.
The engine operating temperature
will vary with changes in weather and
engine load. If the needle points to
the red mark, stop your scooter and
let the engine cool. (See page 6-38
for details.)
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Do not operate the engine if it is
overheated.
INSTRUMENT AND CONTROL FUNCTIONS
3
21
1. Coolant temperature gauge
2. Red mark
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ClockClock
The digital clock shows the time
regardless of the main switch posi-
tion.
To set the clock:
1. Push or hold the hour setting
button “h” to change the hours.
2. Push or hold the minute setting
button “m” to change the min-
utes.
1 23
1. Digital clock
2. Hour setting button “h”
3. Minute setting button “m”
NOTE:
To set the clock after the power
source has been cut, first set the time
to 1:00 AM, and then set the clock to
the correct time.
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5-4
OPERATION AND IMPORTANT RIDING POINTS
5
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Engine break-inEngine break-in
There is never a more important peri-
od in the life of your engine than the
period between 0 and 1,600 km. 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 1,600 km. The various parts in
the engine wear and polish them-
selves to the correct operating clear-
ances. During this period, prolonged
full-throttle operation or any condition
that might result in engine overheat-
ing must be avoided.
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0–1,000 km
Avoid prolonged operation above 1/3
throttle.
1,000–1,600 km
Avoid prolonged operation above 1/2
throttle.
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After 1,000 km of operation, the
engine oil must be changed, and
the oil filter cartridge replaced.
1,600 km and beyond
The vehicle can now be operated
normally.
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If any engine trouble should occur
during the engine break-in period,
immediately have a Yamaha dealer
check the vehicle.
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ParkingParking
When parking, stop the engine, and
then remove the key from the main
switch.
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8 8
Since the engine and exhaust
system can become very hot,
park in a place where pedestri-
ans or children are not likely
to touch them.
8 8
Do not park on a slope or on
soft ground, otherwise the
scooter may overturn.
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6-18
PERIODIC MAINTENANCE AND MINOR REPAIR
6 4. If the coolant is at or below the
minimum level mark, open the
reservoir cap, add coolant to the
maximum level mark, and then
close the reservoir cap.
1
1. Coolant reservoir cap
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Never attempt to remove the radia-
tor cap when the engine is hot.
5. Install the coolant reservoir cover
by installing the screw.
NOTE:
The radiator fan is automatically
switched on or off according to the
coolant temperature in the radiator. If
the engine overheats, see page 6-38
for further instructions.
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8
8
If coolant is not available, use
distilled water or soft tap water
instead. Do not use hard water
or salt water since it is harmful
to the engine.
8 8
If water has been used instead
of coolant, replace it with
coolant as soon as possible,
otherwise the engine may not
be sufficiently cooled and the
cooling system will not be pro-
tected against frost and corro-
sion.
8 8
If water has been added to the
coolant, have a Yamaha dealer
check the antifreeze content of
the coolant as soon as possi-
ble, otherwise the effective-
ness of the coolant will be
reduced.
Coolant reservoir capacity
(up to the maximum level mark):
0.35 L
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6-38
PERIODIC MAINTENANCE AND MINOR REPAIR
6 Engine overheating
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8 8
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.
8 8
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
hissing sound has stopped, press down on the cap while turning it counterclockwise, and then remove the
cap.
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 NOTE.)
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.
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.
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