2012 YAMAHA CYGNUS 125 maintenance

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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**
12
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 flames or sparks in
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EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
the area, including pilot lights from
water heaters or furnaces. Gasoline
or gasoline vapors can ignite or
explode, causing severe injury or
property damage.
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EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
EAUT1982
Troubleshooting chart
Check the fuel level in
the fuel tank.1. Fuel
There is enough fuel.
There is no fuel.
Check the compression.
Supply fuel.
The engine does not start.
Check the compression.
Operate the electric starter.2. Compression
There is compression.
There is no compression.
Check the ignition.
Have a Yamaha dealer
check the vehicle.
Remove the spark plug
and check the electrodes.3. Ignition
Wipe off with a dry cloth and correct the
spark plug gap, or replace the spark plug.
Have a Yamaha dealer check the vehicle.
The engine does not start.
Have a Yamaha dealer
check the vehicle.
The engine does not start.
Check the battery.
Operate the electric starter.4. Battery
The engine turns over
quickly.
The engine turns over
slowly.
The battery is good.Check the battery lead connections,
and charge the battery if necessary.
DryWet
Operate the electric starter.
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INDEXAAcceleration and deceleration ................... 5-2
Air fi lter and V-belt case air fi lter
elements ............................................... 6-13
Auxiliary light bulb, replacing .................. 6-29BBattery ..................................................... 6-24
Brake fl uid, changing .............................. 6-20
Brake fl uid level, checking ...................... 6-19
Brake lever, front ....................................... 3-6
Brake lever, rear ....................................... 3-6
Brake levers, lubricating .......................... 6-21
Brake lever free play, checking ............... 6-18
Brake pads and shoes, checking ............ 6-19
Braking ...................................................... 5-2CCables, checking and lubricating ............ 6-21
Care .......................................................... 7-1
Catalytic converters .................................. 3-9
Centerstand and sidestand, checking and
lubricating ............................................. 6-22DDimmer switch .......................................... 3-6EEngine break-in ......................................... 5-3
Engine oil and oil strainer ........................ 6-10
Engine trouble warning light ...................... 3-2FFinal transmission oil .............................. 6-12
Front fork, checking ................................ 6-23
Fuel ........................................................... 3-7
Fuel consumption, tips for reducing .......... 5-3
Fuel tank cap ............................................ 3-7
Fuses, replacing ...................................... 6-26
HHandlebar switches ................................... 3-5
Headlight bulb, replacing ........................ 6-27
High beam indicator light .......................... 3-2
Horn switch ............................................... 3-6IIdentifi cation numbers ............................... 9-1
Ignition circuit cut-off system ................... 3-12
Indicator and warning lights ...................... 3-2KKeyhole cover ........................................... 3-2
Kickstarter ................................................. 3-9MMaintenance, emission control system ..... 6-3
Maintenance and lubrication, periodic ...... 6-4
Main switch/steering lock .......................... 3-1
Matte color, caution ................................... 7-1
Model label ................................................ 9-1
Multi-function display ................................ 3-3PPanels, removing and installing ................ 6-7
Parking ...................................................... 5-4
Part locations ............................................ 2-1RRear brake lever free play, adjusting ...... 6-18SSafe-riding points ...................................... 1-5
Safety information ..................................... 1-1
Seat ......................................................... 3-10
Sidestand ................................................ 3-11
Spark plug, checking ................................. 6-8
Specifi cations ............................................ 8-1
Speedometer ............................................ 3-3
Starting off ................................................. 5-2Starting the engine .................................... 5-1
Start switch ............................................... 3-6
Steering, checking .................................. 6-23
Storage ..................................................... 7-4
Storage compartments ............................ 3-10
TTail/brake light bulb or rear turn signal light
bulb, replacing ...................................... 6-28
Throttle grip and cable, checking and
lubricating ............................................. 6-21
Throttle grip free play, checking .............. 6-15
Tires ........................................................ 6-16
Tool kit ...................................................... 6-2
Troubleshooting ...................................... 6-29
Troubleshooting chart ............................. 6-31
Turn signal indicator light .......................... 3-2
Turn signal light bulb (front), replacing .... 6-28
Turn signal switch ..................................... 3-6VValve clearance ...................................... 6-15
Vehicle identifi cation number .................... 9-1WWheels .................................................... 6-17
Wheel bearings, checking ....................... 6-24
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