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INSTRUMENT AND CONTROL FUNCTIONS
3-7
Clock mode
1. Clock
2. “SELECT” button
3. “RESET” button
NOTE:
The clock is displayed even when the
key is turned to "OFF".
T
o set the clock:
1. Push the "SELECT" button for atleast four seconds.
2. When the hour digits start flash- ing, push the "RESET" button to
set the hours.
3. Push the "SELECT" button, and the minute digits will start flashing.
4. Push the "RESET" button to set the minutes.
5. Push the "SELECT" button and then release it to start the clock.
Fuel meter
1. Fuel meter
With the key in the "ON" position, the
fuel meter indicates the amount of fuel
in the fuel tank. When the key is turned
to "ON", all of the display segments of
the fuel meter will appear one after the
other and then disappear in order to
test the electrical circuit. The display
segments of the fuel meter disappear
towards "E" (Empty) as the fuel level
decreases. When only one segment is
left near "E" (Empty), refuel as soon
as possible.
NOTE:
This fuel meter is equipped with a self-
diagnosis system. If the electrical circuit
is defective, all the segments will start
flashing. If this occurs, have a Yamaha
dealer check the electrical circuit.
Self-diagnosis devices
1. Engine trouble warning light “ U”
2. Immobilizer system indicator light “ ”
This model is equipped with a self-di-
agnosis device for various electrical
circuits.
If any of those circuits are defective,
the engine trouble warning light will
start flashing. If this occurs, have a
Yamaha dealer check the vehicle.
This model is also equipped with a
self-diagnosis device for the immobi-
lizer system.
If any of the immobilizer system cir-
cuits are defective, the immobilizer
system indicator light will start flash-
ing.
If this occurs, have a Yamaha dealer
check the vehicle.
XT660Z 01-03 ING 28-07-2008 14:13 Pagina 3-7
Page 26 of 97

INSTRUMENT AND CONTROL FUNCTIONS
3-10
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EAU12733
Hazard switch “r”
With the key in the “ON” or Fposition,
use this switch to turn on the hazard
lights (simultaneous flashing of all turn
signal lights).
The hazard lights are used in case of
an emergency or to warn other drivers
when your vehicle is stopped where it
might be a traffic hazard.
ECA10061CAUTION:
Do not use the hazard lights for an
extended length of time with the
engine not running, otherwise the
battery may discharge.
EAU12820
Clutch lever
1. Clutch lever
The clutch lever is located at the left
handlebar grip. To disengage the
clutch, pull the lever toward the han-
dlebar grip. To engage the clutch, re-
lease the lever. The lever should be
pulled rapidly and released slowly for
smooth clutch operation.
The clutch lever is equipped with a
clutch switch, which is part of the igni-
tion circuit cut-off system. (See page
3-17).
1
EAU12870
Shift pedal
1. Shift pedal
The shift pedal is located on the left
side of the engine and is used in com-
bination with the clutch lever when
shifting the gears of the 5-speed con-
stant-mesh transmission equipped on
this motorcycle.
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INSTRUMENT AND CONTROL FUNCTIONS
3-11
EAU26822
Brake lever
1. Brake lever
2. Position adjusting dial
3. Arrow mark
4. Distance
The brake lever is located at the right
handlebar grip. To apply the front
brake, pull the lever toward the han-
dlebar grip.
The brake lever is equipped with a po-
sition adjusting dial. To adjust the dis-
tance between the brake lever and the
handlebar grip, turn the adjusting dial
while holding the lever pushed away
from the handlebar grip. Make sure
that the appropriate setting on the ad-
justing dial is aligned with the “˙”
mark on the brake lever.
EAU12941
Brake pedal
1. Brake pedal
The brake pedal is on the right side of
the motorcycle. To apply the rear
brake, press down on the brake pedal.
1
EAU13072
Fuel tank cap
1. Lock cover
2. Open
To open the fuel tank cap
Open the fuel tank cap lock cover, in-
sert the key into the lock, and then turn
it 1/4 turn clockwise. The lock will be re-
leased and the fuel tank cap can be
opened.
XT660Z 01-03 ING 10-03-2008 16:11 Pagina 3-11
Page 40 of 97

OPERATION AND IMPORTANT RIDING POINTS
3. Start the engine by pushing thestart switch.
NOTE:
If the engine fails to start, release the
start switch, wait a few seconds, and
then try again. Each starting attempt
should be as short as possible to pre-
serve the battery. Do not crank the en-
gine more than 10 seconds on any one
attempt.
ECA11040CAUTION:
For maximum engine life, never ac-
celerate hard when the engine is
cold!
NOTE:
The engine is warm when it quickly re-
sponds to the throttle.
EAU16671
Shifting
1. Shift pedal
N. Neutral position
Shifting gears lets you control the
amount of engine power available for
starting off, accelerating, climbing
hills, etc.
The gear positions are shown in the il-
lustration.
NOTE:
To shift the transmission into the neu-
tral position, press the shift pedal down
repeatedly until it reaches the end of its
travel, and then slightly raise it.
ECA10260CAUTION:
●Even with the transmission in
the neutral position, do not
coast for long periods of time
with the engine off, and do not
tow the motorcycle for long
distances. The transmission is
properly lubricated only when
the engine is running. Inade-
quate lubrication may damage
the transmission.
●Always use the clutch while
changing gears to avoid dam-
aging the engine, transmission,
and drive train, which are not
designed to withstand the
shock of forced shifting.
5-2
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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, a\
nd 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.)
XT660Z 04-06 ING 11-03-2008 8:31 Pagina 6-41