Page 55 of 98

PERIODIC MAINTENANCE AND ADJUSTMENT
6-11
6 tion, otherwise hot engine oil
could spout out and cause dam-
age or injury. Always let the en-
gine oil cool down sufficiently
before removing the oil filler
cap.
[EWA17640]
TIPThe engine oil tank is located in-
side of the frame.
The engine oil should be between
the minimum and maximum level
marks.4. If the engine oil is below the mini-
mum level mark, add sufficient oil
of the recommended type to raiseit to the correct level. NOTICE: Do
not operate the vehicle until you
know that the engine oil level is
sufficient.
[ECA10012]
5. Install the oil filler cap.
To change the engine oil (with or
without oil filter element replace-
ment)
1. Start the engine, warm it up for
several minutes, and then turn it
off.
2. Remove the engine guard by re-
moving 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 filler cap
2. Maximum level mark
3. Minimum level mark
1. Screw
2. Engine guard
1. Engine oil drain bolt (crankcase)
1. Engine oil drain bolt (oil tank)ZAUM1262ZAUM1263
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Page 66 of 98

PERIODIC MAINTENANCE AND ADJUSTMENT
6-22
6Rear brake (for XT660Z)
Rear brake (for XT660ZA)
TIPThe rear brake fluid reservoir is located
under the seat. (See page 3-16.)
WARNING
EWA16011
Improper maintenance can result in
loss of braking ability. Observe
these precautions:
Insufficient brake fluid may al-
low air to enter the brake sys-
tem, reducing braking
performance.
Clean the filler cap before re-
moving. Use only DOT 4 brake
fluid from a sealed container.
Use only the specified brake flu-
id; otherwise, the rubber seals
may deteriorate, causing leak-
age.
Refill with the same type of
brake fluid. Adding a brake fluid
other than DOT 4 may result in a
harmful chemical reaction.
Be careful that water or dust
does not enter the brake fluid
reservoir when refilling. Water
will significantly lower the boil-
ing point of the fluid and may re-sult in vapor lock, and
dirt may
clog the ABS hydraulic unit
valves.
NOTICE
ECA17641
Brake fluid may damage painted
surfaces or plastic parts. Always
clean up spilled fluid immediately.As the brake pads wear, it is normal for
the brake fluid level to gradually go
down. A low brake fluid level may indi-
cate worn brake pads and/or brake
system leakage; therefore, be sure to
check the brake pads for wear and the
brake system for leakage. If the brake
fluid level goes down suddenly, have a
Yamaha dealer check the cause before
further riding.
1. Minimum level mark
1. Minimum level mark
Specified brake fluid:
DOT 4
U2BDE1E0.book Page 22 Tuesday, December 16, 2014 5:38 PM
Page 76 of 98
![YAMAHA XT660Z 2015 Owners Manual PERIODIC MAINTENANCE AND ADJUSTMENT
6-32
6use a fuse of a higher amperage
rating than recommended to
avoid causing extensive dam-
age to the electrical system and
possibly a fire.
[EWA15132]
3. Turn YAMAHA XT660Z 2015 Owners Manual PERIODIC MAINTENANCE AND ADJUSTMENT
6-32
6use a fuse of a higher amperage
rating than recommended to
avoid causing extensive dam-
age to the electrical system and
possibly a fire.
[EWA15132]
3. Turn](/manual-img/51/53212/w960_53212-75.png)
PERIODIC MAINTENANCE AND ADJUSTMENT
6-32
6use a fuse of a higher amperage
rating than recommended to
avoid causing extensive dam-
age to the electrical system and
possibly a fire.
[EWA15132]
3. Turn the key to “ON” and turn on
the electrical circuit in question to
check if the device operates.4. If the fuse immediately blows
again, have a Yamaha dealer
check the electrical system.
EAUB1583
Replacing a headlight bulbThis model is equipped with halogen
bulb headlights. If a headlight bulb
burns out, replace it as follows.NOTICE
ECA10651
Take care not to damage the follow-
ing parts:
Headlight bulb
Do not touch the glass part of
the headlight bulb to keep it free
from oil, otherwise the transpar-
ency of the glass, the luminosity
of the bulb, and the bulb life will
be adversely affected. Thor-
oughly clean off any dirt and fin-
gerprints on the headlight bulb
using a cloth moistened with al-
cohol or thinner.
Headlight lens
Do not affix any type of tinted
film or stickers to the headlight
lens.
Do not use a headlight bulb of a
wattage higher than specified.
Specified fuses:
Main fuse:
30.0 A
Parking lighting fuse:
10.0 A
Signaling system fuse:
10.0 A
Headlight fuse:
20.0 A
Ignition fuse:
10.0 A
Fuel injection system fuse:
10.0 A
Radiator fan motor fuse:
7.5 A
Backup fuse:
10.0 A
ABS motor fuse:
XT660ZA 30.0 A
ABS solenoid fuse:
XT660ZA 20.0 A
ABS control unit fuse:
XT660ZA 5.0 A
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Page 90 of 98

SPECIFICATIONS
8-1
8
Dimensions:Overall length:
2246 mm (88.4 in)
Overall width:
896 mm (35.3 in)
Overall height:
XT660Z 1477 mm (58.1 in)
XT660ZA 1450 mm (57.1 in)
Seat height:
XT660Z 896 mm (35.3 in)
XT660ZA 865 mm (34.1 in)
Wheelbase:
XT660Z 1500 mm (59.1 in)
XT660ZA 1505 mm (59.3 in)
Ground clearance:
XT660Z 260 mm (10.24 in)
XT660ZA 205 mm (8.07 in)
Minimum turning radius:
XT660Z 1958 mm (77.1 in)
XT660ZA 1980 mm (78.0 in)Weight:Curb weight:
XT660Z 206 kg (454 lb)
XT660ZA 215 kg (474 lb)Engine:Engine type:
Liquid cooled 4-stroke, SOHC
Cylinder arrangement:
Single cylinder
Displacement:
660 cm³
Bore × stroke:
100.0 × 84.0 mm (3.94 × 3.31 in)Compression ratio:
10.0 : 1
Starting system:
Electric starter
Lubrication system:
Dry sump
Engine oil:Recommended brand:
YAMALUBE
Type:
SAE 10W-30, 10W-40, 15W-40, 20W-40 or
20W-50
Recommended engine oil grade:
API service SE type or higher, JASO
standard MA
Engine oil quantity:
Without oil filter element replacement:
2.50 L (2.64 US qt, 2.20 Imp.qt)
With oil filter element replacement:
2.60 L (2.75 US qt, 2.29 Imp.qt)
Coolant quantity:Coolant reservoir (up to the maximum level
mark):
0.50 L (0.53 US qt, 0.44 Imp.qt)
Radiator (including all routes):
1.70 L (1.80 US qt, 1.50 Imp.qt)Air filter:Air filter element:
Dry elementFuel:Recommended fuel:
Premium unleaded gasoline only
Fuel tank capacity:
23.0 L (6.07 US gal, 5.06 Imp.gal)
Fuel reserve amount:
XT660Z 6.7 L (1.77 US gal, 1.47 Imp.gal)
XT660ZA 5.8 L (1.53 US gal, 1.28 Imp.gal)Fuel injection:Throttle body:
ID mark:
5YK2 11Spark plug(s):Manufacturer/model:
NGK/CR7E
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)Clutch:Clutch type:
Wet, multiple-discTransmission:Primary reduction ratio:
75/36 (2.083)
Final drive:
Chain
–20 –10 0
1020 30 40 50 C 10 30 50 70 90 110 0 130 F
SAE 10W-30
SAE 15W-40SAE 20W-40SAE 20W-50
SAE 10W-40SAE 10W-50
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Page 92 of 98

SPECIFICATIONS
8-3
8
Rear brake:Type:
Single disc brake
Operation:
Right foot operation
Specified brake fluid:
DOT 4Front suspension:Type:
Telescopic fork
Spring/shock absorber type:
Coil spring/oil damper
Wheel travel:
XT660Z 210 mm (8.3 in)
XT660ZA 160 mm (6.3 in)Rear suspension:Type:
Swingarm (link suspension)
Spring/shock absorber type:
Coil spring/gas-oil damper
Wheel travel:
XT660Z 200 mm (7.9 in)
XT660ZA 145 mm (5.7 in)Electrical system:Ignition system:
TCI
Charging system:
AC magnetoBattery:Model:
XT660Z GT9B-4
XT660ZA YTZ10SVoltage, capacity:
XT660Z 12 V, 8.0 Ah
XT660ZA 12 V, 8.6 Ah
Headlight:Bulb type:
Halogen bulbBulb voltage, wattage × quantity:Headlight:
12 V, 55.0 W × 2
Tail/brake light:
LED
Front turn signal light:
12 V, 10.0 W × 2
Rear turn signal light:
12 V, 10.0 W × 2
Auxiliary light:
12 V, 3.0 W × 2
License plate light:
12 V, 5.0 W × 1
Meter lighting:
LED
Neutral indicator light:
LED
High beam indicator light:
LED
Turn signal indicator light:
LED
Coolant temperature warning light:
LED
Engine trouble warning light:
LED
ABS warning light:
XT660ZA LEDImmobilizer system indicator light:
LED
Fuses:Main fuse:
30.0 A
Headlight fuse:
20.0 A
Signaling system fuse:
10.0 A
Ignition fuse:
10.0 A
Parking lighting fuse:
10.0 A
Radiator fan motor fuse:
7.5 A
Fuel injection system fuse:
10.0 A
ABS control unit fuse:
XT660ZA 5.0 A
ABS motor fuse:
XT660ZA 30.0 A
ABS solenoid fuse:
XT660ZA 20.0 A
Backup fuse:
10.0 A
U2BDE1E0.book Page 3 Tuesday, December 16, 2014 5:38 PM