2005 YAMAHA CYGNUS 125 engine

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EAU10210
TABLE OF CONTENTSSAFETY INFORMATION....... 1-1
Further safe-riding points ..... 1-4
DESCRIPTION ....................... 2-1
Left view ............................... 2-1
Right view ............................. 2-2
Controls and instruments ..... 2-3
INSTRUMENT AND CONTROL
FUNCTIONS........................... 3-1
Main switch/steering lock ..... 3-1
Indicator lights ...................... 3-2
Speedometer unit................. 3-3
Fuel gauge ............................ 3-3
Handlebar switches .............. 3-3
Front brake lever .................. 3-4
Rear brake lever ................... 3-4
Fuel tank cap ........................ 3-5
Fuel...................................... 3-6
Catalytic converter ............... 3-6
Kickstarter............................ 3-7
Seat ......................................3-7
Helmet holder ....................... 3-8
Storage compartment ........... 3-8
Luggage hook ....................... 3-9
Sidestand ...........................3-10Sidestand switch operation
check...............................3-10
PRE-OPERATION CHECKS . 4-1
Pre-operation check list ........ 4-2
OPERATION AND IMPORTANT
RIDING POINTS.................... 5-1
Starting a cold engine ........... 5-1
Starting off ............................ 5-2
Acceleration and
deceleration....................... 5-2
Braking ................................. 5-2
Tips for reducing fuel consump-
tion..................................... 5-3
Engine break-in .................... 5-3
Parking ................................. 5-4
PERIODIC MAINTENANCE
AND MINOR REPAIR ............ 6-1
Owner’s tool kit ..................... 6-1
Periodic maintenance and
lubrication chart ................. 6-3
Removing and installing
panels ................................ 6-6
Checking the spark plug ....... 6-7Engine oil and oil strainer ...... 6-8
Final transmission oil..........6-10
Air filter and V-belt case air filter
elements..........................6-11
Adjusting the carburetor..... 6-13
Adjusting the throttle cable free
play ..................................6-14
Valve clearance ..................6-14
Tires...................................6-15
Cast wheels.......................6-17
Checking the front brake lever
free play...........................6-17
Adjusting the rear brake lever
free play...........................6-18
Checking the front brake pads
and rear brake shoes ......6-18
Checking the front brake fluid
level .................................6-19
Changing the brake fluid .....6-20
Checking and lubricating the
cables..............................6-20
Checking and lubricating the
throttle grip and cable ......6-21
Lubricating the front and rear
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Q QQ Q
Q SAFETY INFORMATION
9Always signal before turning or
changing lanes. Make sure that
other motorists can see you.
8The posture of the operator and
passenger is important for proper
control.
9The operator should keep both
hands on the handlebar and
both feet on the footboard
during operation to maintain
control of the scooter.
9The passenger should always
hold onto the operator, the seat
strap or grab bar, if equipped,
with both hands and keep both
feet on the passenger foot-
rests.
9Never carry a passenger unless
he or she can firmly place both
feet on the passenger foot-
rests.
8Never ride under the influence of
alcohol or other drugs.
This scooter is designed for on-road
use only. It is not suitable for off-
road use.Protective apparel
The majority of fatalities from scooter
accidents are the result of head injuries.
The use of a safety helmet is the single
most critical factor in the prevention or
reduction of head injuries.
8Always wear an approved helmet.
8Wear a face shield or goggles. Wind
in your unprotected eyes could con-
tribute to an impairment of vision
which could delay seeing a hazard.
8The use of a jacket, substantial
shoes, trousers, gloves, etc., is
effective in preventing or reducing
abrasions or lacerations.
8Never wear loose-fitting clothes,
otherwise they could catch on the
control levers or wheels and cause
injury or an accident.
8Never touch the engine or exhaust
system during or after operation.
They become very hot and can
cause burns. Always wear protec-
tive clothing that covers your legs,
ankles, and feet.
8Passengers should also observe
the above precautions.Modifications
Modifications made to this scooter not
approved by Yamaha, or the removal of
original equipment, may render the
scooter unsafe for use and may cause
severe personal injury. Modifications
may also make your scooter illegal to
use.
Loading and accessories
Adding accessories or cargo to your
scooter can adversely affect stability
and handling if the weight distribution of
the scooter is changed. To avoid the
possibility of an accident, use extreme
caution when adding cargo or accesso-
ries to your scooter. Use extra care when
riding a scooter that has added cargo or
accessories. Here are some general
guidelines to follow if loading cargo or
adding accessories to your scooter:
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Q QQ Q
Q SAFETY INFORMATION
tric failure could result, which could
cause a dangerous loss of lights or
engine power.
Gasoline and exhaust gas
8GASOLINE IS HIGHLY FLAM-
MABLE:
9Always turn the engine off
when refueling.
9Take care not to spill any
gasoline on the engine or
exhaust system when refueling.
9Never refuel while smoking or
in the vicinity of an open flame.
8Never start the engine or let it run
for any length of time in a closed
area. The exhaust fumes are poi-
sonous and may cause loss of con-
sciousness and death within a
short time. Always operate your
scooter in an area that has adequate
ventilation.
8Always turn the engine off before
leaving the scooter unattended and
remove the key from the main
switch. When parking the scooter,
note the following:
9The engine and exhaustsystem may be hot, therefore,
park the scooter in a place
where pedestrians or children
are not likely to touch these hot
areas.
9Do not park the scooter on a
slope or soft ground, otherwise
it may fall over.
9Do not park the scooter near a
flammable source (e.g., a
kerosene heater, or near an
open flame), otherwise it could
catch fire.
8If you should swallow any gasoline,
inhale a lot of gasoline vapor, or
allow gasoline to get into your eyes,
see your doctor immediately. If any
gasoline spills on your skin or cloth-
ing, immediately wash the affected
area with soap and water and
change your clothes.
EAU10371
Further safe-riding points8Be sure to signal clearly when mak-
ing turns.ZAUM00**Turn leftZAUM00**Turn right
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INSTRUMENT AND CONTROL FUNCTIONS
EAU10460
Main switch/steering lockZAUM00**
OFFON
The main switch/steering lock controls
the ignition and lighting systems, and is
used to lock the steering. The various
positions are described below.
EAU10660
OFF
All electrical systems are off. The key
can be removed.
EAUT1422
ON
All electrical circuits are supplied with
power; the meter lighting, taillight, and
auxiliary light come on, and the engine
can be started. The key cannot be re-
moved.NOTE:
The headlights come on automatically
when the engine is started and stay on
until the key is turned to “OFF” or the
sidestand is moved down.
EAU10680
LOCK
The steering is locked, and all electrical
systems are off. The key can be re-
moved.To loc
k the steer
ing
ZAUM00**
OFFON
1
1. Push1. Turn the handlebars all the way to
the left.
2. Push the key in from the “OFF” po-
sition, and then turn it to “LOCK”
while still pushing it.
3. Remove the key.
To unloc
k the steer
ing
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ZAUM00**1. Tur n
2. ReleasePush the key in, and then turn it to “OFF”
while still pushing it.
EWA10060
wNever turn the key to “OFF” or
“LOCK” while the vehicle is moving,
otherwise the electrical systems will
be switched off, which may result in
loss of control or an accident. Make
sure that the vehicle is stopped be-
fore turning the key to “OFF” or
“LOCK”.
EAU10443
INSTRUMENT AND CONTROL FUNCTIONS
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INSTRUMENT AND CONTROL FUNCTIONS
EAU10980
Indicator lightsZAUM00**
12
ZAUM00**
12
1. High beam indicator light ”&”
2. Turn signal indicator light “5”
EAU11020
Turn signal indicator light “
5 55 5
5”
This indicator light flashes when the turn
signal switch is pushed to the left or right.
EAU11080
High beam indicator light “
& && &
&”
This indicator light comes on when the
high beam of the headlight is switched
on.
EAUT1370
Oil change indicator
This indicator changes from green to red
every 3000 km (1800 mi) to indicate that
the engine oil should be changed.After changing the engine oil, reset the
oil change indicator switch by pushing
it in.
ZAUM00**
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1. Oil change indicator
2. Reset switchIf the engine oil is changed before the
3000 km (1800 mi) interval, the indica-
tor must be reset after the oil change
for the next periodic oil change to be
indicated at the correct time.NOTE:
After resetting the oil change indicator
switch, the indicator changes from red
to green.
ECA10280
cCAfter 1000 km (600 mi) of operation,
the engine oil must be changed.
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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 44 4
4/
6 66 6
6”
To signal a right-hand turn, push this
switch to “4”. To signal a left-hand turn,
push this switch to “6”. 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 cen-
ter position.
EAU12500
Horn switch “
* ** *
*”
Press this switch to sound the horn.
EAU12720
Start switch “
, ,, ,
,”
With the sidestand up, push this switch
while applying the front or rear brake to
crank the engine with the starter.
ECA10050
cCSee page 5-1 for starting instructions
prior to starting the engine.
EAU12900
Front brake leverZAUM00**
1
1. Front brake leverThe front brake lever is located on the
right handlebar grip. To apply the front
brake, pull this lever toward the handle-
bar grip.
EAU12950
Rear brake leverZAUM00**
1
1. Rear brake leverThe rear brake lever is located on the
left handlebar grip. To apply the rear
brake, pull this lever toward the handle-
bar grip.
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INSTRUMENT AND CONTROL FUNCTIONS
EAU13210
FuelZAUM00**
1
1. Fuel levelMake sure that there is sufficient fuel in
the tank. Fill the fuel tank to the bottom
of the filler tube as shown.
EWA10880
w8 88 8
8Do not overfill the fuel tank, oth-
erwise it may overflow when the
fuel warms up and expands.
8 88 8
8Avoid spilling fuel on the hot
engine.
ECA10070
cCImmediately wipe off spilled fuel with
a clean, dry, soft cloth, since fuel maydeteriorate painted surfaces or plas-
tic parts.
EAU33520
Recommended fuel:
REGULAR UNLEADED GASO-
LINE ONLY
Fuel tank capacity:
7.1 L (1.86 US gal) (1.55 Imp.gal)
ECA11400
cCUse only unleaded gasoline. The use
of leaded gasoline will cause severe
damage to internal engine parts, such
as the valves and piston rings, as well
as to the exhaust system.Your Yamaha engine has been designed
to use regular unleaded gasoline 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 main-
tenance costs.
EAU13431
Catalytic converterThis model is equipped with a catalytic
converter in the exhaust system.
EWA10860
wThe exhaust system is hot after op-
eration. Make sure that the exhaust
system has cooled down before do-
ing any maintenance work.
ECA10700
cCThe following precautions must be
observed to prevent a fire hazard or
other damages.
8 88 8
8Use only unleaded gasoline. The
use of leaded gasoline will cause
unrepairable damage to the cata-
lytic converter.
8 88 8
8Never park the vehicle near pos-
sible fire hazards such as grass
or other materials that easily
burn.
8 88 8
8Do not allow the engine to idle
too long.
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INSTRUMENT AND CONTROL FUNCTIONS
EAU13680
KickstarterZAUM00**
1
1. KickstarterTo start the engine, fold out the
kickstarter lever, move it down lightly
with your foot until the gears engage,
and then push it down smoothly but
forcefully.
EAU13931
SeatTo open the seat
1. Place the scooter on the
centerstand.
2. Insert the key into the main switch,
and then turn it counterclockwise.ZAUM00**
OFFON
NOTE:
Do not push inward when turning the key.3. Fold the seat up.
To close the seat
1. Fold the seat down, and then push
it down to lock it in place.
2. Remove the key from the main
switch if the scooter will be left un-
attended.
NOTE:
Make sure that the seat is properly se-
cured before riding.
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