2011 YAMAHA CYGNUS 125 engine

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EAU1044E
INSTRUMENT AND CONTROL FUNCTIONS
EAU12400
Dimmer switch “&/%”
Set this switch to “&” for the high
beam and to “%” for the low beam.
EAU12460
Turn signal switch “4/6”
To signal a right-hand turn, push this
switch to “6”. To signal a left-hand
turn, push this switch to “4”. When
released, the switch returns to the
center position. To cancel the turn
signal lights, push the switch in after it
has returned to the center position.
EAU12500
Horn switch “*”
Press this switch to sound the horn.
EAU12721
Start switch “,”
With the sidestand up, push this
switch while applying the front or rear
brake to crank the engine with the
starter. See page 5-1 for starting in-
structions prior to starting the engine.
EAU12900
Front brake leverZAUM00**
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1. Front brake leverThe front brake lever is located on
the right handlebar grip. To apply the
front brake, pull this lever toward the
handlebar grip.
EAU12950
Rear brake leverZAUM00**
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1. Rear brake leverThe rear brake lever is located on the
left handlebar grip. To apply the rear
brake, pull this lever toward the han-
dlebar grip.
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EAU1044E
INSTRUMENT AND CONTROL FUNCTIONS
vicinity of sparks, open fl ames, or
other sources of ignition such as
the pilot lights of water heaters
and clothes dryers.
2. Do not overfi ll the fuel tank. When
refueling, be sure to insert the
pump nozzle into the fuel tank fi ll-
er hole. Stop fi lling when the fuel
reaches the bottom of the fi ller
tube. Because fuel expands when
it heats up, heat from the engine
or the sun can cause fuel to spill
out of the fuel tank.
3. Wipe up any spilled fuel im-
mediately.
NOTICE:
Immedi-
ately wipe off spilled fuel with a
clean, dry, soft cloth, since fuel
may deteriorate painted sur-
faces or plastic parts.[ECA10071]
4. Be sure to securely close the fuel
tank cap.
EWA15151
WARNING
Gasoline is poisonous and can
cause injury or death. Handle
gasoline with care. Never siphon
gasoline by mouth. If you should
swallow some gasoline or inhale a
lot of gasoline vapor, or get some
gasoline in your eyes, see your
doctor immediately. If gasoline
spills on your skin, wash with soap
and water. If gasoline spills on your
clothing, change your clothes.
EAU33520
Recommended fuel:
REGULAR UNLEADED GASO-
LINE ONLY
Fuel tank capacity:
7.4 L (1.96 US gal) (1.63 Imp.gal)
ECA11400
NOTICEUse only unleaded gasoline. The
use of leaded gasoline will cause
severe damage to internal engine
parts, such as the valves and pis-
ton rings, as well as to the exhaust
system.
Your Yamaha engine has been de-
signed to use regular unleaded gaso-
line with a research octane number of
91 or higher. If knocking (or pinging)
occurs, use a gasoline of a different
brand or premium unleaded fuel. Use of unleaded fuel will extend spark plug
life and reduce maintenance costs.
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EAU1044E
INSTRUMENT AND CONTROL FUNCTIONS
EAU13445
Catalytic convertersThis vehicle is equipped with catalytic
converters in the exhaust system.
EWA10862
WARNING
The exhaust system is hot after op-
eration. To prevent a re hazard or
burns:● Do not park the vehicle near
possible re hazards such as
grass or other materials that
easily burn.● Park the vehicle in a place
where pedestrians or children
are not likely to touch the hot
exhaust system.● Make sure that the exhaust
system has cooled down be-
fore doing any maintenance
work.● Do not allow the engine to idle
more than a few minutes. Long
idling can cause a build-up of
heat.
ECA10701
NOTICEUse only unleaded gasoline. The
use of leaded gasoline will cause
unrepairable damage to the cata-
lytic converter.
EAU13680
KickstarterZAUM00**
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1. Kickstarter To start the engine, fold out the kick-
starter lever, move it down lightly with
your foot until the gears engage, and
then push it down smoothly but force-
fully.
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EAU1044E
INSTRUMENT AND CONTROL FUNCTIONS
EWA10241
WARNING
The vehicle must not be ridden with
the sidestand down, or if the sid-
estand cannot be properly moved
up (or does not stay up), otherwise
the sidestand could contact the
ground and distract the operator,
resulting in a possible loss of con-
trol. Yamaha’s ignition circuit cut-
off system has been designed to
assist the operator in ful lling the
responsibility of raising the sides-
tand before starting off. Therefore,
check this system regularly and
have a Yamaha dealer repair it if it
does not function properly.
EAUT1095
Ignition circuit cut-off systemCheck the operation of the sidestand
switch according to the following pro-
cedure.Turn the key on.
Put the sidestand up.Push the start switch while applying
either of the brake levers. The engine will
start.Put the sidestand down.
If the engine stalls:
The sidestand switch is OK.
WARNING
● The vehicle must be placed on
the centerstand during this in-
spection.● If a malfunction is noted, have
a Yamaha dealer check the
system before riding.
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4-2
EAU15582
FOR YOUR SAFETY - PRE-OPERATION CHECKSBefore using this vehicle, check the following points:
ITEM CHECKS PAGE
Fuel• Check fuel level in fuel tank.
• Refuel if necessary.
• Check fuel line for leakage.3-7
Engine oil• Check oil level in engine.
• If necessary, add recommended oil to specifi ed level.
• Check vehicle for oil leakage.6-10
Final transmission oil• Check vehicle for oil leakage. 6-12
Front brake• Check operation.
• If soft or spongy, have Yamaha dealer bleed hydraulic system.
• Check brake pads for wear.
• Replace if necessary.
• Check fl uid level in reservoir.
• If necessary, add recommended brake fl uid to specifi ed level.
• Check hydraulic system for leakage.6-18~6-20
Rear brake• Check operation.
• Lubricate cable if necessary.
• Check lever free play.
• Adjust if necessary.6-18, 6-19
Throttle grip• Make sure that operation is smooth.
• Check throttle grip free play.
• If necessary, have Yamaha dealer adjust throttle grip free play and lubricate
cable and grip housing.6-15, 6-21
Wheels and tires• Check for damage.
• Check tire condition and tread depth.
• Check air pressure.
• Correct if necessary.6-16, 6-17
Brake levers• Make sure that operation is smooth.
• Lubricate lever pivoting points if necessary.6-21
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5-1
EAU15943
OPERATION AND IMPORTANT RIDING POINTS
EAU15943
OPERATION AND IMPORTANT RIDING POINTS
EAU15951
Read the Owner’s Manual carefully
to become familiar with all controls.
If there is a control or function you
do not understand, ask your Yamaha
dealer.
EWA10271
WARNING
Failure to familiarize yourself with
the controls can lead to loss of
control, which could cause an ac-
cident or injury.
EAU45310
TIPThis model is equipped with a lean
angle sensor to stop the engine in
case of a turnover. To start the en-
gine after a turnover, be sure to turn
the main switch to “OFF” and then to
“ON”. Failing to do so will prevent the
engine from starting even though the
engine will crank when pushing the
start switch.
EAUT1863
Starting the engine
ECA10250
NOTICESee page 5-3 for engine break-in
instructions prior to operating the
vehicle for the rst time.
In order for the ignition circuit cut-off
system to enable starting, the sides-
tand must be up.
See page 3-12 for more information.
1. Turn the key to “ON”.
2. Close the throttle completely.
3. Start the engine by pushing the
start switch while applying the
front or rear brake.
NOTICE:
For
maximum engine life, never ac-
celerate hard when the engine
is cold!
[ECA11041]
If the engine does not start, re-
lease the start switch, wait a few
seconds, and then try again.
Each starting attempt should be
as short as possible to preserve
the battery. Do not crank the en-
gine more than 5 seconds on any
one attempt. If the engine does not start with the starter motor, try
using the kickstarter.
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EAU15943
OPERATION AND IMPORTANT RIDING POINTS
EAU16780
Acceleration and decelera-
tion
(a)(b)
The speed can be adjusted by open-
ing and closing the throttle. To in-
crease the speed, turn the throttle grip
in direction (a). To reduce the speed,
turn the throttle grip in direction (b).
EAU16793
Braking
EWA10300
WARNING
● Avoid braking hard or sud-
denly (especially when leaning
over to one side), otherwise the
scooter may skid or overturn.● Railroad crossings, streetcar
rails, iron plates on road con-
struction sites, and manhole
covers become extremely slip-
pery when wet. Therefore, slow
down when approaching such
areas and cross them with cau-
tion.● Keep in mind that braking on
a wet road is much more dif -
cult.● Ride slowly down a hill, as
braking downhill can be very
dif cult.
1. Close the throttle completely.
2. Apply both front and rear brakes
simultaneously while gradually
increasing the pressure.
EAU16761
Starting offTIPBefore starting off, allow the engine to
warm up.
1. While pulling the rear brake lever
with your left hand and holding
the grab bar with your right hand,
push the scooter off the center-
stand.
2. Sit astride the seat, and then ad-
just the rear view mirrors.
3. Switch the turn signals on.
4. Check for oncoming traffi c, and
then slowly turn the throttle grip
(on the right) in order to take off.
5. Switch the turn signals off.
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5-3
EAU15943
OPERATION AND IMPORTANT RIDING POINTS
EAU16820
Tips for reducing fuel con-
sumptionFuel consumption depends largely on
your riding style. Consider the follow-
ing tips to reduce fuel consumption:● Avoid high engine speeds during
acceleration.● Avoid high engine speeds with no
load on the engine.● Turn the engine off instead of let-
ting it idle for an extended length
of time (e.g., in traffi c jams, at
traffi c lights or at railroad cross-
ings).
EAU16830
Engine break-inThere is never a more important pe-
riod in the life of your engine than the
period between 0 and 1000 km (600
mi). For this reason, you should read
the following material carefully.
Since the engine is brand new, do not
put an excessive load on it for the fi rst
1000 km (600 mi). The various parts
in the engine wear and polish them-
selves to the correct operating clear-
ances. During this period, prolonged
full-throttle operation or any condition
that might result in engine overheating
must be avoided.
EAU16951
0 ~ 150 km (0 ~ 90 mi)
Avoid prolonged operation above 1/3
throttle.
After every hour of operation, stop the
engine, and then let it cool for fi ve to
ten minutes.
Vary the engine speed from time to
time. Do not operate the engine at
one set throttle position.
150 ~ 500 km (90 ~ 300 mi)
Avoid prolonged operation above 1/2
throttle.
Rev the engine freely through the
gears, but do not use full throttle at
any time.
500 ~ 1000 km (300 ~ 600 mi)
Avoid prolonged operation above
3/4 throttle.
NOTICE:
After 1000 km
(600 mi) of operation, the engine oil
must be changed and the oil strain-
er cleaned.
[ECA10351]
1000 km (600 mi) and beyond
Avoid prolonged full-throttle operation.
Vary the speed occasionally.
ECA10270
NOTICEIf any engine trouble should occur
during the engine break-in period,
immediately have a Yamaha dealer
check the vehicle.
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