2011 YAMAHA CYGNUS 125 Owners Manual

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EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
Recommended lubricants:
Front brake lever:
Silicone grease
Rear brake lever:
Lithium-soap-based grease
EAU23213
Checking and lubricating the
centerstand and sidestandZAUM00**The operation of the centerstand and
sidestand should be checked before
each ride, and the pivots and metal-
to-metal contact surfaces should be
lubricated if necessary.
EWA10741
WARNING
If the centerstand or sidestand
does not move up and down
smoothly, have a Yamaha dealer
check or repair it. Otherwise, the
centerstand or sidestand could
contact the ground and distract the
operator, resulting in a possible
loss of control.
Recommended lubricant:
Lithium-soap-based grease
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EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
EAU23272
Checking the front forkThe condition and operation of the
front fork must be checked as follows
at the intervals specifi ed in the period-
ic maintenance and lubrication chart.
To check the condition
Check the inner tubes for scratches,
damage and excessive oil leakage.
To check the operation
1. Place the vehicle on a level sur-
face and hold it in an upright
position. WARNING! To avoid
injury, securely support the ve-
hicle so there is no danger of it
falling over.
[EWA10751]
2. While applying the front brake,
push down hard on the handle-
bars several times to check if the
front fork compresses and re-
bounds smoothly.
ZAUM00**
ECA10590
NOTICEIf any damage is found or the front
fork does not operate smoothly,
have a Yamaha dealer check or re-
pair it.
EAU45511
Checking the steeringWorn or loose steering bearings may
cause danger. Therefore, the opera-
tion of the steering must be checked
as follows at the intervals specifi ed in
the periodic maintenance and lubrica-
tion chart.
1. Place the vehicle on the cen-
terstand. WARNING! To avoid
injury, securely support the ve-
hicle so there is no danger of it
falling over.
[EWA10751]
2. Hold the lower ends of the front
fork legs and try to move them
forward and backward. If any free
play can be felt, have a Yamaha
dealer check or repair the steer-
ing.
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EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
ZAUM00**
EAU23291
Checking the wheel bearingsThe front and rear wheel bearings
must be checked at the intervals
specifi ed in the periodic maintenance
and lubrication chart. If there is play in
the wheel hub or if the wheel does not
turn smoothly, have a Yamaha dealer
check the wheel bearings.
EAUT1857
BatteryZAUM00**
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1. BatteryThis model is equipped with a VRLA
(Valve Regulated Lead Acid) battery.
There is no need to check the electro-
lyte or to add distilled water. However,
the battery lead connections need to
be checked and, if necessary, tight-
ened.TIPThe battery is located behind panel D.
(See page 6-8.)
EWA10760
WARNING
●
Electrolyte is poisonous and
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6-25
EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
dangerous since it contains
sulfuric acid, which causes se-
vere burns. Avoid any contact
with skin, eyes or clothing and
always shield your eyes when
working near batteries. In case
of contact, administer the fol-
lowing FIRST AID.
• EXTERNAL: Flush with plen-
ty of water.
• INTERNAL: Drink large quan-
tities of water or milk and im-
mediately call a physician.
• EYES: Flush with water for
15 minutes and seek prompt
medical attention.
●
Batteries produce explosive
hydrogen gas. Therefore, keep
sparks, ames, cigarettes, etc.,
away from the battery and pro-
vide suf cient ventilation when
charging it in an enclosed
space.
●
KEEP THIS AND ALL BATTER-
IES OUT OF THE REACH OF
CHILDREN.
To charge the battery
Have a Yamaha dealer charge the
battery as soon as possible if it seems
to have discharged. Keep in mind that
the battery tends to discharge more
quickly if the vehicle is equipped with
optional electrical accessories.
ECA16520
NOTICETo charge a VRLA (Valve Regulated
Lead Acid) battery, a special (con-
stant-voltage) battery charger is
required. Using a conventional bat-
tery charger will damage the bat-
tery. If you do not have access to a
constant-voltage battery charger,
have a Yamaha dealer charge your
battery.
To store the battery
1. If the vehicle will not be used for
more than one month, remove
the battery, fully charge it, and
then place it in a cool, dry place.
NOTICE:
When removing the
battery, be sure the key is
turned to “OFF”, then discon-
nect the negative lead before
disconnecting the positive
lead.
[ECA16302]
2. If the battery will be stored for
more than two months, check it
at least once a month and fully
charge it if necessary.
3. Fully charge the battery before
installation.
4. Before installation, make sure
that the battery leads are properly
connected to the battery termi-
nals.
ECAT1053
NOTICE●
Always keep the battery
charged. Storing a discharged
battery can cause permanent
battery damage.
●
After installing the battery, be
sure to turn the main switch
from “ON” to “OFF” three
times in 3 seconds intervals to
initialize the idle speed control
system.
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EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
EAUT1915
Replacing the fusesThe main fuse box is located above
the battery.ZAUM00**
1
1. Main fuseThe fuse box, which contains the fus-
es for the individual circuits, is located
in the storage compartment. (See
page 3-10.)
ZAUM00**
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1. Lid
2. Backup fuse
3. Ignition fuse
4. Signaling system fuse
5. Taillight fuse
6. Headlight fuseIf a fuse is blown, replace it as follows.
1. Turn the key to “OFF” and turn off
the electrical circuit in question.
2. Remove the blown fuse, and then
install a new fuse of the specifi ed
amperage. WARNING! Do not
use a fuse of a higher amper-
age rating than recommended
to avoid causing extensive
damage to the electrical sys-
tem and possibly a re.
[EWA15131]

NOTICE:
After removing and
installing the main fuse, be sure to turn the main switch
from “ON” to “OFF” three
times in 3 seconds intervals to
initialize the idle speed control
system.
[ECAT1062]
Speci ed fuses:
Main fuse:
20 A
Headlight fuse:
15 A
Signaling system fuse:
15 A
Ignition fuse:
7.5 A
Backup fuse:
7.5 A
Taillight fuse:
7.5 A3. 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.
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EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
EAUT2134
Replacing the headlight bulbThis model is equipped with a halogen
bulb headlight. If the headlight bulb
burns out, replace it as follows.
ECA10650
NOTICETake 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 transparency
of the glass, the luminosity of the
bulb, and the bulb life will be ad-
versely affected. Thoroughly clean
off any dirt and ngerprints on the
headlight bulb using a cloth moist-
ened with alcohol or thinner.
●
Headlight lens
• Do not af x any type of
tinted lm or stickers to the
headlight lens.
• Do not use a headlight bulb
of a wattage higher than
speci ed.1. Place the vehicle on the center-
stand.
2. Remove panel B. (See page 6-7.)
3. Disconnect the headlight coupler,
and then remove the bulb cover.
ZAUM00**
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1. Bulb cover4. Unhook the headlight bulb holder,
and then remove the burnt-out
bulb.
ZAUM00**
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1. Headlight bulb holder5. Place a new headlight bulb into
position, and then secure it with
the bulb holder.
6. Install the headlight bulb cover,
and then connect the coupler.
7. Install the panel.
8. Have a Yamaha dealer adjust the
headlight beam if necessary.
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EAUT1892
Replacing a front turn signal
light bulb
ECA10670
NOTICEIt is advisable to have a Yamaha
dealer perform this job.
1. Place the scooter on the center-
stand.
2. Remove panel A. (See page 6-7.)
3. Remove the socket (together with
the bulb) by turning it counter-
clockwise.
4. Remove the burnt out bulb by
pushing it in and turning it coun-
terclockwise.ZAUM00**
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1. Turn signal light bulb
2. Socket
5. Insert a new bulb into the socket,
push it in, and then turn it clock-
wise until it stops.
6. Install the socket (together with
the bulb) by turning it clockwise.
7. Install the panel.
EAUT1923
Replacing the tail/brake light
bulb or a rear turn signal light
bulbZAUM00**3
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1. Tail/brake light lens
2. Turn signal light lens
3. Rear turn signal light bulb
4. Tail/brake light bulbTail/brake light bulb
1. Remove the tail/brake light lens
by removing the screws.
2. Remove the burnt out bulb by
pushing it in and turning it coun-
terclockwise.
3. Insert a new bulb into the socket,
push it in, and then turn it clock-
wise until it stops.
4. Install the lens by installing the
screws.
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EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENTRear turn signal light bulb
1. Remove the tail/brake light lens
by removing the screws.
2. Remove the turn signal light lens
by removing the screws.
3. Remove the burnt out bulb by
pushing it in and turning it coun-
terclockwise.
4. Insert a new bulb into the socket,
push it in, and then turn it clock-
wise until it stops.
5. Install the turn signal light lens by
installing the screws.
6. Install the tail/brake light lens
by installing the screws.
NO-
TICE:
Do not overtighten the
screws, otherwise the lens may
break.[ECA10681]EAUT1963
Replacing an auxiliary light
bulbZAUM00**
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1. Auxiliary light bulb
2. SocketThis model is equipped with two aux-
iliary lights. If an auxiliary light bulb
burns out, replace it as follows.
1. Remove panel B. (See page 6-7.)
2. Remove the auxiliary light socket
(together with the bulb) by turning
it counterclockwise.
3. Remove the burnt out bulb by
pulling it out.
4. Insert a new bulb into the socket.
5. Install the auxiliary light socket
(together with the bulb) by turning
it clockwise.
6. Install the panel.
EAU25861
TroubleshootingAlthough Yamaha scooters receive a
thorough inspection before shipment
from the factory, trouble may occur
during operation. Any problem in the
fuel, compression, or ignition systems,
for example, can cause poor starting
and loss of power.
The following troubleshooting chart
represents a quick and easy pro-
cedure for checking these vital sys-
tems yourself. However, should your
scooter require any repair, take it to a
Yamaha dealer, whose skilled techni-
cians have the necessary tools, expe-
rience, and know-how to service the
scooter properly.
Use only genuine Yamaha replace-
ment parts. Imitation parts may look
like Yamaha parts, but they are often
inferior, have a shorter service life and
can lead to expensive repair bills.
EWA15141
WARNING
When checking the fuel system, do
not smoke, and make sure there
are no open ames or sparks in
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