warning YAMAHA XT660Z 2008 User Guide

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INSTRUMENT AND CONTROL FUNCTIONS
3-15
EAUB1550
Adjusting the front fork
1. Spring preload adjusting bolt
(a) Increasing the spring preload
(b) Decreasing the spring preload
This front fork is equipped with spring
preload adjusting bolt.

EWA10180
WARNING0
Always adjust both fork legs equal-
ly, otherwise poor handling and
loss of stability may result.
Adjust the spring preload as follows.
To increase the spring preload and
thereby harden the suspension, turn
the adjusting bolts on each fork leg in
direction (a). To decrease the spring
preload and thereby soften the sus-
pension, turn the adjusting bolts on
each fork leg in direction (b).

Maximum (hard):0 complete turns in direction (b)*
Standard: 22 complete turns in direction (b)*
Minimum (soft): 27 complete turns in direction (b)*
* With the adjusting bolt fully turned in
direction (a)
NOTE:
Use the 10 mm hexagon wrench in-
cluded in the owner’s tool kit to turn
the adjusting bolts.

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INSTRUMENT AND CONTROL FUNCTIONS
3-16
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Adjust the spring preload as follows.
To increase the spring preload and
thereby harden the suspension, turn
the adjusting ring in direction (a).
To decrease the spring preload and
thereby soften the suspension, turn
the adjusting ring in direction (b).
NOTE:
Align the appropriate notch in the ad-
justing ring with the position indicator
on the shock absorber.
EWAB0020
WARNING0
Never adjust the spring preload un-
til the exhaust system has cooled
down.

EWA10220
WARNING0
This shock absorber contains high-
ly pressurized nitrogen gas. For
proper handling, read and under-
stand the following information be-
fore handling the shock absorber.
The manufacturer cannot be held
responsible for property damage or
personal injury that may result from
improper handling.
●Do not tamper with or attempt
to open the gas cylinder.
●Do not subject the shock ab-
sorber to an open flame or oth-
er high heat sources, otherwise
it may explode due to exces-
sive gas pressure.
●Do not deform or damage the
gas cylinder in any way, as this
will result in poor damping per-
formance.
●Always have a Yamaha dealer
service the shock absorber.

EAUB1460
Adjusting the shock
absorber assembly
1. Spring preload adjusting ring
2. Position indicator
(a) Increasing the spring preload
(b) Decreasing the spring preload
This shock absorber assembly is
equipped with a spring preload adjust-
ing ring.
ECA10100CAUTION:
Never attempt to turn an adjusting
mechanism beyond the maximum
or minimum settings.

Spring preload setting: Minimum (soft):1
Standard: 2
Maximum (hard): 9

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EWA10240
WARNING0
The vehicle must not be ridden
with the sidestand down, or if the
sidestand cannot be properly
moved up (or does not stay up),
otherwise the sidestand could con-
tact the ground and distract the
operator, resulting in a possible
loss of control. Yamaha’s ignition
circuit cut-off system has been de-
signed to assist the operator in ful-
filling the responsibility of raising
the sidestand before starting off.
Therefore, check this system regu-
larly as described below and have
a Yamaha dealer repair it if it does
not function properly.

EAU15301
Sidestand
1. Sidestand
The sidestand is located on the left
side of the frame. Raise the sidestand
or lower it with your foot while holding
the motorcycle upright.
NOTE:
The built-in sidestand switch is part of
the ignition circuit cut-off system,
which cuts the ignition in certain situa-
tions. (See further down for an expla-
nation of the ignition circuit cut-off sys-
tem.)

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INSTRUMENT AND CONTROL FUNCTIONS
3-17
EAU15312
Ignition circuit cut-off
system
The ignition circuit cut-off system
(comprising the sidestand switch,
clutch switch and neutral switch) has
the following functions.
●It prevents starting when the
transmission is in gear and the
sidestand is up, but the clutch
lever is not pulled.
●It prevents starting when the
transmission is in gear and the
clutch lever is pulled, but the side-
stand is still down.
●It cuts the running engine when
the transmission is in gear and
the sidestand is moved down.
Periodically check the operation of the
ignition circuit cut-off system accord-
ing to the following procedure.
EWA10250
WARNING0
If a malfunction is noted, have a
Yamaha dealer check the system
before riding.

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PRE-OPERATION CHECKS
4-1
EAU15593
The condition of a vehicle is the owner’s responsibility. Vital components can start to deteriorate quickly and unexpected-
ly, even if the vehicle remains unused (for example, as a result of exposure to the elements). Any damage, fluid leakage
or loss of tire air pressure could have serious consequences. Therefore, it is very important, in addition to a thorough vi-
sual inspection, to check the following points before each ride.
NOTE:
Pre-operation checks should be made each time the vehicle is used. Such an inspection can be accomplished in a very
short time; and the added safety it assures is more than worth the time involved.
EWA11150
WARNING0
If any item in the Pre-operation check list is not working properly, have it inspected and repaired before operat-
ing the vehicle.

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OPERATION AND IMPORTANT RIDING POINTS
EAU15950
EWA10270
WARNING0
●Become thoroughly familiar
with all operating controls and
their functions before riding.
Consult a Yamaha dealer re-
garding any control or function
that you do not thoroughly un-
derstand.
●Never start the engine or oper-
ate it in a closed area for any
length of time. Exhaust fumes
are poisonous, and inhaling
them can cause loss of con-
sciousness and death within a
short time. Always make sure
that there is adequate ventila-
tion.
●Before starting out, make sure
that the sidestand is up. If the
sidestand is not raised com-
pletely, it could contact the
ground and distract the opera-
tor, resulting in a possible loss
of control.

EAUB1570
Starting the engine
In order for the ignition circuit cut-off
system to enable starting, one of the
following conditions must be met:
●The transmission is in the neutral
position.
●The transmission is in gear with
the clutch lever pulled and the
sidestand up.
EWA10290
WARNING0
●Before starting the engine,
check the function of the igni-
tion circuit cut-off system ac-
cording to the procedure de-
scribed on page 3-18.
●Never ride with the sidestand
down.
1. Turn the key to “ON” and make sure that the engine stop switch is
set to “
I”.

ECAB0070CAUTION:
The following warning lights and in-
dicator lights should come on for a
few seconds, then go off.
●Neutral indicator light
●Turn signal indicator light
●High beam indicator light
●Engine trouble warning light
●Coolant temperature warning
light
●Immobilizer system indicator
light
If a warning or indicator light does
not go off, see page 3-3 for the cor-
responding warning and indicator
light circuit check.
2. Shift the transmission into the neutral position.
NOTE:
When the transmission is in the neu-
tral position, the neutral indicator light
should be on, otherwise have a Yama-
ha dealer check the electrical circuit.
5-1

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OPERATION AND IMPORTANT RIDING POINTS
ECA10310CAUTION:
●Keep the engine speed out of
the tachometer red zone.
●If any engine trouble should oc-
cur during the engine break-in
period, immediately have a
Yamaha dealer check the
vehicle.
5-4
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EAU17212
Parking
When parking, stop the engine, and
then remove the key from the main
switch.
EWA10310
WARNING0
●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.
●Do not park on a slope or on
soft ground, otherwise the ve-
hicle may overturn.
ECA10380CAUTION:
Never park in an area where there
are fire hazards such as grass or
other flammable materials.

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PERIODIC MAINTENANCE AND MINOR REPAIR
EAU17240
Safety is an obligation of the owner.
Periodic inspection, adjustment and
lubrication will keep your vehicle in the
safest and most efficient condition
possible. The most important points of
inspection, adjustment, and lubrica-
tion are explained on the following
pages.
The intervals given in the periodic
maintenance and lubrication chart
should be simply considered as a gen-
eral guide under normal riding condi-
tions. However, DEPENDING ON THE
WEATHER, TERRAIN, GEOGRAPHI-
CAL LOCATION, AND INDIVIDUAL
USE, THE MAINTENANCE INTER-
VALS MAY NEED TO BE SHORT-
ENED.
EWA10320
WARNING0
If you are not familiar with motorcy-
cle maintenance work, have a
Yamaha dealer do it for you.

EAU17380
Owner’s tool kit
1. Owner’s tool kit
The owner’s tool kit is located under
the seat. (See page 3-14).
The service information included in
this manual and the tools provided in
the owner’s tool kit are intended to as-
sist you in the performance of preven-
tive maintenance and minor repairs.
However, additional tools such as a
torque wrench may be necessary to
perform certain maintenance work
correctly.

NOTE:
If you do not have the tools or experi-
ence required for a particular job, have
a Yamaha dealer perform it for you.
EWA10350
WARNING0
Modifications not approved by
Yamaha may cause loss of perfor-
mance and render the vehicle un-
safe for use. Consult a Yamaha
dealer before attempting any
changes.

6-1

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PERIODIC MAINTENANCE AND MINOR REPAIR
6-10
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To change the engine oil
(with or without oil filter element
replacement)
1. Mounting screw
2. Engine guard
1. Start the engine, warm it up for sev- eral minutes, and then turn it off.
2. To reach the drain bolt of the crankcase and the drain bolt of
the oil tank, remove the engine
guard by removing the screws.
3. Place an oil pan under the engine to collect the used oil.
4. Remove the engine oil filler cap and the drain bolt to drain the oil
from the crankcase.
5. Remove the drain bolt to drain the oil from the oil tank.

1. Engine oil crankcase drain bolt
1. Engine oil tank drain bolt
6. Remove the oil filter elementdrain bolt to drain the oil from the
oil filter element.

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ECA10010CAUTION:
Do not operate the vehicle until you
know that the engine oil level is suf-
ficient.
EWA10360
WARNING0
Never remove the engine oil tank
cap after high-speed operation,
otherwise hot engine oil could
spout out and cause damage or in-
jury. Always let the engine oil cool
down sufficiently before removing
the oil tank cap.
4. If the engine oil is below the mini- mum level mark, add sufficient oil
of the recommended type to raise
it to the correct level.
5. Install the oil filler cap.

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PERIODIC MAINTENANCE AND MINOR REPAIR
6-13
NOTE:
The coolant should be between the
minimum and maximum level marks.
1. Coolant reservoir
2. Maximum level mark
3. Minimum level mark
4. Reservoir cap
3. If the coolant is at or below theminimum level mark, remove pan-
el E (See page 6-7.), remove the
reservoir cap, add coolant to the
maximum level mark, and then in-
stall the reservoir cap and the
panel.

ECA10471CAUTION:
● 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.
● If water has been used instead
of coolant, replace it with
coolant as soon as possible,
otherwise the cooling system
will not be protected against
frost and corrosion.
● 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 re-
duced.
Coolant reservoir capacity:
0.50 L (0.52 US qt) (0.44 Imp.qt)
EWA10380
WARNING0
Never attempt to remove the radia-
tor cap when the engine is hot.
NOTE:
●The radiator fan is automatically
switched on or off according to
the coolant temperature in the ra-
diator.
●If the engine overheats, see page
3-4 for further instructions.
EAU33030
Changing the coolant
EWA10380
WARNING0
Never attempt to remove the radia-
tor cap when the engine is hot.
The coolant must be changed at the
intervals specified in the periodic
maintenance and lubrication chart.
Have a Yamaha dealer change the
coolant.

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PERIODIC MAINTENANCE AND MINOR REPAIR
6-16
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EAU21640
Tires
To maximize the performance, durabil-
ity, and safe operation of your motor-
cycle, note the following points regard-
ing the specified tires.
Tire air pressure
The tire air pressure should be
checked and, if necessary, adjusted
before each ride.
EWA10500
WARNING0
●The tire air pressure must be
checked and adjusted on cold
tires (i.e., when the tempera-
ture of the tires equals the am-
bient temperature).
●The tire air pressure must be
adjusted in accordance with
the riding speed and with the
total weight of rider, passenger,
cargo, and accessories ap-
proved for this model.

EAU21382
Checking the throttle cable
free play
1. Throttle cable free play
The throttle cable free play should
measure 3.0-5.0 mm (0.12-0.20 in) at
the throttle grip. Periodically check the
throttle cable free play and, if neces-
sary, have a Yamaha dealer adjust it.

EAU21401
Valve clearance
The valve clearance changes with
use, resulting in improper air-fuel mix-
ture and/or engine noise. To prevent
this from occurring, the valve clear-
ance must be adjusted by a Yamaha
dealer at the intervals specified in the
periodic maintenance and lubrication
chart.

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