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PERIODIC M\fINTEN\fNCE \fND \fDJ\bSTMENT
7-13
TIP
The coolant should be between the
\fini\fu\f and \faxi\fu\f level \fa\bks.
1. Coolant \bese\bvoi\b
2. Maxi\fu\f level \fa\bk
3. Mini\fu\f level \fa\bk
4. Rese\bvoi\b cap
3. If the coolant is at o\b below the\fini\fu\f level \fa\bk, \be\fove pan-
el E (See page 7-7.), \be\fove the
\bese\bvoi\b cap, add coolant to the
\faxi\fu\f level \fa\bk, and then in-
stall the \bese\bvoi\b cap and the
panel. W\fRNING! Remove only
the coolant reservoir cap. Nev-
er attempt to remove the radia-
tor cap when the engine is hot.
NOTICE: If coolant is not avail-
able, use distilled water or soft
tap water instead. Do not use
hard water or salt water since it
is harmful to the engine. If wa-
ter 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 an-
tifreeze content of the coolant
as soon as possible, otherwise
the effectiveness of the coolant
will be reduced.
Coolant reservoir capacity
(up to the maximum\M level mark): 0.50 L (0.52 US qt\w) (0.44 I\fp.
EAU33031
Changing the coolant
The coolant \fust be changed at the
inte\bvals specified in the pe\biodic
\faintenance and lub\bication cha\bt.
Have a Ya\faha deale\b change the
coolant. W\fRNING! Never attempt
to remove the radiator cap when
the engine is hot.\M
XT660Z 05-07 ING-AUS:MY03 04-06 ING 11-05-2009 10:09 Pagina 7-13
Page 83 of 100

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PERIODIC M\fINTEN\fNCE \fND \fDJ\bSTMENT
7-41
Engine overheatingEWA10400
W\fRNING0
●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 cau\Mse serious injury. Be sure to wait until th\Me engine has coole\Md.
●\ffter 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 hiss-
ing sound has stopped, press down on the cap while turning it counterclockwise, and then remove the cap.
TIP
If coolant is not a\failable, ta\b water can be tem\borarily used instead, \bro\fided that it is changed to the recommended
coolant as soon as \b\sossible.
Wait until the
engine has cooled.Check the coolant le\fel
in the reser\foir and radiator.
The coolant le\fel is low.
Check the cooling
system for leakage.
The coolant le\fel
is OK.
There is
leakage.
There is no
leakage.
Ha\fe a Yamaha dealer check
and re\bair the cooling system.
Start the engine. If the engine o\ferheats again, ha\fe
a Yamaha dealer check and re\bair the coo\sling system.
Add coolant. (See TIP.)
XT660Z 05-07 ING-AUS:MY03 04-06 ING 11-05-2009 10:10 Pagina 7-41
Page 88 of 100

SPECIFICATIONS
9-1
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9
1\f
Engin\b oil:Type: SAE10W30 or SAE10W40 or SAE15W40
or SAE\f0W40 or SAE\f0W50
Recomme\bded e\bgi\be oil grade: API service SE, SF, SG type or higher
E\bgi\be oil qua\btity: Without oil filter eleme\bt replaceme\bt:\f.50 L (\f.64 US qt) (\f.19 Imp.qt)
With oil filter eleme\bt replaceme\bt: \f.60 L (\f.73 US qt) (\f.\f6 Imp.qt)
Total amou\bt (dry e\bgi\be): \f.90 L (3.07 US qt) (\f.55 Imp.qt)
Cooling syst\bm:Radiator capacity (i\bcludi\bg all routes): 1.\f L (1.\f6 US qt) (1.05 Imp.qt) (Radiator) +
0.5 L (0.5\f US qt) (0.44 Imp.qt)
(Coola\bt reservoir)
Coola\bt reservoir capacity (up to the
maximum level mark): 0.50 L (0.5\f US qt) (0.44 Imp.qt)
From low to full level: 0.30 L (0.3\f US qt) (0.\f6 Imp.qt)
Air filt\br:Air filter eleme\bt:Paper
Fu\bl:Recomme\bded fuel:Premium u\bleaded gasoli\be o\bly
Fuel ta\bk capacity: \f3.0 L (6.07 US gal) (5.06 Imp.gal)
Fuel reserve amou\bt: 6.7 L (1.76 US gal) (1.46 Imp.gal)
Fu\bl inj\bction:Ma\bufacturer:DENSO
Model: \f97500-0390
Spark plug:Ma\bufacturer/model:NGK/CR7EGap:0.7-0.8 mm (0.0\f8-0.03\f i\b)
Clutch:Clutch type:Wet, multiple-disc
Transmission:Primary reductio\b system:Spur gear
Primary reductio\b ratio: 75/36 (\f.083)
Seco\bdary reductio\b system: Chai\b drive
Seco\bdary reductio\b ratio: 45/15 (3.00)
Tra\bsmissio\b type: Co\bsta\bt mesh 5-speed
Dim\bnsions:Overall le\bgth:\f\f46 mm (88.4\f i\b)
Overall width: 864 mm (34.01 i\b)
Overall height: 1477 mm (58.14 i\b)
Seat height: 896 mm (35.\f7 i\b)
Wheelbase: 1500 mm (59.05 i\b)
Grou\bd cleara\bce: \f60 mm (10.\f3 i\b)
Mi\bimum tur\bi\bg radius: 1958 mm (77.08 i\b)
Basic w\bight:With oil a\bd fuel:\f08.5 kg (459 lb)
Engin\b:E\bgi\be type:Liquid cooled 4-stroke, SOHC
Cyli\bder arra\bgeme\bt: Forward-i\bcli\bed si\bgle cyli\bder
Displaceme\bt: 660.0 cm
3(40.\f7 cu.i\b)
Bore x stroke: 100.0 x 84.0 mm (3.94 x 3.31 i\b)
Compressio\b ratio: 10.00 : 1
Starti\bg system: Electric starter
Lubricatio\b system: Dry sump
-\f0 -10 0 10 \f0 30 40 50 °C
SAE 10W-30
SAE 10W-40
SAE \f0W-40
SAE \f0W-50
SAE 15W-40
XT660Z 08-10 ING-AUS:MY03 07-10 ING 11-05-2009 10:10 Pagina 6
Page 90 of 100

SPECIFICATIONS
9-3
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9
1\f
Rea\b suspension:
Type: Swingarm (lin\f suspension\b
Spring/damper type: Coil spring/gas-oil damper, spring
preload adjustable
Wheel travel: 200 mm (7.87 in\b
Elect\bical system:
Ignition system:Transistorized coil ignition (digital\b
Charging system: A.C. magneto
Batte\by:
Model:GT9B-4
Voltage, capacity: 12 V, 8 Ah
Headlight:
Bulb type:Halogen bulb
Bulb voltage, wattage x quantity:Headlight:12 V, 55 W x 2
Auxiliary light: 12 V, 5 W x 2
Tail/bra\fe light: LED
Front turn signal light: 12 V, 10 W x 2
Rear turn signal light: 12 V, 10 W x 2
Meter lighting: LED (bac\flight\b Neutral indicator light:
LED
Turn signal indicator light: LED
High beam indicator light: LED
Coolant temperature warning light: LED
Engine trouble warning light: LED
Immobilizer system indicator light: LED
Fuses:Main fuse:
30 A
Headlight fuse: 20 A
Signaling system fuse: 10 A
Ignition fuse: 10 A
Par\fing lighting fuse: 10 A
Radiator fan fuse: 7.5 A
Fuel injection system fuse: 10 A
Bac\fup fuse (for odometer, cloc\f and immobilizer\b:
10 A
XT660Z 08-10 ING-AUS:MY03 07-10 ING 11-05-2009 10:10 Pagina 8