2012 YAMAHA CYGNUS 125 check engine

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EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENTTIPThe air filter element should be wet
but not dripping.Recommended oil:
Yamaha foam air filter oil or other
quality foam air fi lter oil5. Insert the element into the air fi l-
ter case.
6. Install the fi lter element holder by
installing the screw.
7. Install the V-belt air filter case
cover by installing the screws.
EAU21401
Valve clearanceThe 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 specifi ed in the
periodic maintenance and lubrication
chart.
EAU21384
Checking the throttle grip
free playThe throttle grip free play should mea-
sure 3 ~ 5 mm (0.12 ~ 0.20 in) at the
inner edge of the throttle grip. Periodi-
cally check the throttle grip free play
and, if necessary, have a Yamaha
dealer adjust it.ZAUM00**
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1. Throttle cable free play
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EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
EAU43641
Lubricating the front and rear
brake leversZAUM00**ZAUM00**
The pivoting points of the front and
rear brake levers must be lubricated
at the intervals specifi ed in the period-
ic maintenance and lubrication chart.
EAU23095
Checking and lubricating the
cablesThe operation of all control cables
and the condition of the cables should
be checked before each ride, and
the cables and cable ends should be
lubricated if necessary. If a cable is
damaged or does not move smoothly,
have a Yamaha dealer check or re-
place it.
WARNING! Damage to the outer
housing of cables may result in
internal rusting and cause inter-
ference with cable movement.
Replace damaged cables as soon
as possible to prevent unsafe
conditions.
[EWA10711]
Recommended lubricant:
Yamaha Chain and Cable Lube or
engine oil
EAU23114
Checking and lubricating the
throttle grip and cableThe operation of the throttle grip
should be checked before each ride.
In addition, the cable should be lubri-
cated by a Yamaha dealer at the inter-
vals specified in the periodic mainte-
nance chart.
The throttle cable is equipped with a
rubber cover. Make sure that the cov-
er is securely installed. Even though
the cover is installed correctly, it does
not completely protect the cable from
water entry. Therefore, use care not to
pour water directly onto the cover or
cable when washing the vehicle. If the
cable or cover becomes dirty, wipe
clean with a moist cloth.
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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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EAU25991
SCOOTER CARE AND STORAGE
2. Fill up the fuel tank and add fuel
stabilizer (if available) to prevent
the fuel tank from rusting and the
fuel from deteriorating.
3. Perform the following steps to
protect the cylinder, piston rings,
etc. from corrosion.
a. Remove the spark plug cap
and spark plug.
b. Pour a teaspoonful of engine
oil into the spark plug bore.
c. Install the spark plug cap onto
the spark plug, and then place
the spark plug on the cylinder
head so that the electrodes are
grounded. (This will limit spark-
ing during the next step.)
d. Turn the engine over several
times with the starter. (This will
coat the cylinder wall with oil.)
e. Remove the spark plug cap
from the spark plug, and then
install the spark plug and the
spark plug cap. WARNING!
To prevent damage or injury
from sparking, make sure to
ground the spark plug elec-
trodes while turning the en-gine over.
[EWA10951]
4. Lubricate all control cables and
the pivoting points of all levers
and pedals as well as of the
sidestand/centerstand.
5. Check and, if necessary, correct
the tire air pressure, and then
lift the scooter so that both of its
wheels are off the ground. Alter-
natively, turn the wheels a little
every month in order to prevent
the tires from becoming degraded
in one spot.
6. Cover the muffler outlet with a
plastic bag to prevent moisture
from entering it.
7. Remove the battery and fully
charge it. Store it in a cool,
dry place and charge it once a
month. Do not store the battery
in an excessively cold or warm
place [less than 0 °C (30 °F) or
more than 30 °C (90 °F)]. For
more information on storing the
battery, see page 6-24.
EAU36563
StorageShort-term
Always store your scooter in a cool,
dry place and, if necessary, protect
it against dust with a porous cover.
Be sure the engine and the exhaust
system are cool before covering the
scooter.
ECA10820
NOTICE● Storing the scooter in a poorly
ventilated room or covering it
with a tarp, while it is still wet,
will allow water and humidity to
seep in and cause rust.● To prevent corrosion, avoid
damp cellars, stables (because
of the presence of ammonia)
and areas where strong chemi-
cals are stored.
Long-term
Before storing your scooter for several
months:
1. Follow all the instructions in the
“Care” section of this chapter.
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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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