air filter YAMAHA CYGNUS 125 2005 Owners Manual

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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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DESCRIPTION
EAU10410
Left view
EAU10400
DESCRIPTION1. Luggage hook
2. Battery(Page:6-23)
3. Storage compartment(Page:3-8)
4. Tail/brake light(Page:6-27)
5. Rear turn signal light(Page:6-28)
6. Air filter(Page:6-11)
7. Kickstarter(Page:3-7)
8. V-belt case air filter(Page:6-11)
9. Fuel tank cap(Page:3-5)
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6-1
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PERIODIC MAINTENANCE AND MINOR REPAIR
EAU17224
PERIODIC MAINTENANCE AND MINOR REPAIR
EAU17280
Safety is an obligation of the owner.
Periodic inspection, adjustment and lu-
brication will keep your vehicle in the
safest and most efficient condition pos-
sible. The most important points of in-
spection, adjustment, and lubrication are
explained on the following pages.
The intervals given in the periodic main-
tenance and lubrication chart should be
simply considered as a general guide
under normal riding conditions. However,
DEPENDING ON THE WEATHER, TER-
RAIN, GEOGRAPHICAL LOCATION,
AND INDIVIDUAL USE, THE MAINTE-
NANCE INTERVALS MAY NEED TO BE
SHORTENED.
EWA10320
wIf you are not familiar with mainte-
nance work, have a Yamaha dealer do
it for you.
EWA10330
wThis scooter is designed for use on
paved roads only. If this scooter is
operated in abnormally dusty, muddy
or wet conditions, the air filter ele-
ment should be cleaned or replaced
more frequently, otherwise rapid en-
gine wear may result. Consult a
Yamaha dealer for proper mainte-
nance intervals.
EAU17520
Owner’s tool kitZAUM00**
1
1. Owner’s tool kitThe owner’s tool kit is located inside the
storage compartment under the seat.
(See page 3-7.)
The service information included in this
manual and the tools provided in the
owner’s tool kit are intended to assist
you in the performance of preventive
maintenance and minor repairs. How-
ever, additional tools such as a torque
wrench may be necessary to perform
certain maintenance work correctly.
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PERIODIC MAINTENANCE AND MINOR REPAIR
EAU17710
Periodic maintenance and lubrication chartNOTE:
8 88 8
8The annual checks must be performed every year, except if a kilometer-based maintenance is performed in-
stead.
8From 30000 km, repeat the maintenance intervals starting from 6000 km.
8Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools, data and technical
skills.NO. ITEM CHECK OR MAINTENANCE JOBODOMETER READING (u1,000 km)
ANNUAL
CHECK
1 6 12 18 24
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*Fuel line Check fuel hoses and vacuum hose for cracks or damage.———— —
2 Spark plug Check condition.
 Clean and regap.——
 Replace.——
3*Valves Check valve clearance.
 Adjust.————
4 Air filter element Clean.——
 Replace.——
5V-belt case air filter
element Clean.————
6*Front brake Check operation, fluid level and vehicle for fluid leakage.————— —
 Replace brake pads. Whenever worn to the limit
7*Rear brake Check operation and adjust brake lever free play.————— —
 Replace brake shoes. Whenever worn to the limit
8*Brake hose Check for cracks or damage.———— —
 Replace. Every 4 years
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PERIODIC MAINTENANCE AND MINOR REPAIR
EAU18660
NOTE:
8The air filter needs more frequent service if you are riding in unusually wet or dusty areas.
8Hydraulic brake service
9Regularly check and, if necessary, correct the brake fluid level.
9Every two years replace the internal components of the brake master cylinder and caliper, and change the brake
fluid.
9Replace the brake hoses every four years and if cracked or damaged.24 Moving parts and cables Lubricate.———— —
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*Throttle grip housing
and cable Check operation and free play.
 Adjust the throttle cable free play if necessary.
 Lubricate the throttle grip housing and cable.———— —
26*Air induction system Check the air cut-off valve, reed valve, and hose for
damage.
 Replace the entire air induction system if necessary.———— —
27*Lights, signals and
switches Check operation.
 Adjust headlight beam.————— — NO. ITEM CHECK OR MAINTENANCE JOBODOMETER READING (u1,000 km)
ANNUAL
CHECK
1 6 12 18 24
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PERIODIC MAINTENANCE AND MINOR REPAIR
ZAUM00**
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1. Final transmission oil filler cap5. Install the final transmission oil
drain bolt, and then tighten it to the
specified torque.ZAUM00**
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1. Final transmission oil drain bolt
Tightening torque:
Final transmission oil drain bolt:
23 Nm (2.3 m  kgf, 16.6 ft  lbf)
6. Add the specified amount of the
recommended final transmission
oil, and then install and tighten the
oil filler cap.
Recommended final transmission
oil:
See page 8-1.
Oil quantity:
0.13 L (0.14 US qt) (0.1 Imp.qt)
EWA11310
w8 88 8
8Make sure that no foreign mate-
rial enters the final transmission
case.
8 88 8
8Make sure that no oil gets on the
tire or wheel.7. Check the final transmission case
for oil leakage. If oil is leaking,
check for the cause.
EAUT1341
Air filter and V-belt case air fil-
ter elementsThe air filter and V-belt case air filter el-
ements should be cleaned at the inter-
vals specified in the periodic mainte-
nance and lubrication chart. Clean both
filter elements more frequently if you are
riding in unusually wet or dusty areas.
Cleaning the air filter element
1. Place the scooter on the
centerstand.
2. Remove the air filter case cover by
removing the screws.ZAUM00**
2(×6)
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1. Air filter case cover
2. Screw3. Pull the air filter element out, and
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PERIODIC MAINTENANCE AND MINOR REPAIR
then blow the dirt out with com-
pressed air as shown.
ZAUM00**
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1. Air filter element4. Check the air filter element for dam-
age and replace it if necessary.
5. Insert the air filter element into the
air filter case.
ECA10480
cC8 88 8
8Make sure that the air filter ele-
ment is properly seated in the air
filter case.
8 88 8
8The engine should never be op-
erated without the air filter ele-
ment installed, otherwise the
piston(s) and/or cylinder(s) may
become excessively worn.
6. Install the air filter case cover by
installing the screws.
Cleaning the V-belt case air filter ele-
ment
1. Remove the V-belt air filter case
cover by removing the screws.ZAUM00**
21
1. Air filter case cover
2. Screw2. Remove the filter element holder by
removing the screw.
ZAUM00**
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1. Air filter element holder3. Pull the air filter element out, and
then clean it with solvent. After
cleaning, remove the remaining
solvent by squeezing the element.
EWA10430
wUse only a dedicated parts cleaning
solvent. To avoid the risk of fire or
explosion, do not use gasoline or
solvents with a low flash point.
ECA10520
cCTo avoid damaging the air filter ele-
ment, handle it gently and carefully,
and do not twist it.
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PERIODIC MAINTENANCE AND MINOR REPAIR
ZAUM00**
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1. V-belt case air filter element4. Apply oil of the recommended type
to the entire surface of the sponge
material, and then squeeze the ex-
cess oil out.NOTE:
The air filter element should be wet but
not dripping.
Recommended oil:
Engine oil
5. Insert the element into the air filter
case.
6. Install the filter element holder by
installing the screw.
EAU21300
Adjusting the carburetorThe carburetor is an important part of
the engine and requires very sophisti-
cated adjustment. Therefore, all carbu-
retor adjustments should be left to a
Yamaha dealer, who has the necessary
professional knowledge and experience. 7. Install the V-belt air filter case cover
by installing the screws.
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SPECIFICATIONS
-20˚ -10˚ 0˚ 10˚ 20˚ 30˚ 40˚ 50˚
SAE 10W-30SAE 10W-40
SAE 20W-40SAE 20W-50
ZAUM00**
EAU26320
SPECIFICATIONS
EAU26339
DimensionsOverall length
1855 mm
Overall width
685 mm
Overall height
1110 mm
Seat height
770 mm
Wheelbase
1295 mm
Ground clearance
110 mm
Minimum turning radius
1900 mmWeightWith oil and fuel
121.0 kgEngineEngine type
Forced air cooled 4-stroke, SOHC
Cylinder arrangement
Forward-inclined single cylinder
Displacement
124.0 cm
3
Bore & stroke
52.4 x 57.9 mm
Compression ratio
10.00 :1
Starting system
Electric starter and kickstarter
Lubrication system
Wet sump
Engine oilType
SAE20W40
Recommended engine oil grade
API service SE, SF, SG type or higher
Engine oil quantity
Periodic oil change
0.90 L
Without oil filter element removal
0.90 LFinal transmission oilType
SAE10W30 type SE motor oil
Quantity
0.13 LAir filterAir filter element
Oil-coated paper elementFuelRecommended fuel
Regular unleaded gasoline only
Fuel tank capacity
7.1 L
CarburetorManufacturer
Taiwan KEI HIN
Type x quantity
CVK24 x 1Spark plug(s)Manufacturer/model
NGK / CR7E
Spark plug gap
0.6-0.7 mmClutchClutch type
Dry, centrifugal automaticTransmissionPrimary reduction system
Helical gear
Primary reduction ratio
38/13 (2.923)
Secondary reduction system
Helical gear
Secondary reduction ratio
40 / 12 (3.333)
Transmission type
V-belt automatic
Operation
Centrifugal automatic typeChassisFrame type
Steel tube underbone
Caster angle
27.00 degree
Trail
90.0 mm
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INDEXAAcceleration and deceleration.................. 5-2
Air filter and V-belt case air filter
elements................................................6-11BBattery.....................................................6-23
Brake fluid level, checking ......................6-19
Brake fluid, changing ..............................6-20
Brake lever, front ...................................... 3-4
Brake lever, rear....................................... 3-4
Brake levers, lubricating.........................6-21
Brake pads and shoes, checking..........6-18
Braking...................................................... 5-2CCables, checking and lubricating ...........6-20
Carburetor,adjusting...............................6-13
Catalytic converter................................... 3-6
Centerstand and sidestand, checking and lu-
bricating.................................................6-21DDimmer switch.......................................... 3-4EEngine break-in ......................................... 5-3
Engine oil and oil strainer .......................... 6-8FFinal transmission oil ..............................6-10
Front brake lever free play, checking....6-17
Fuel........................................................... 3-6
Fuel consumption, tips for reducing ......... 5-3
Fuel gauge ................................................ 3-3
Fuel tank cap ............................................ 3-5
Fuses, replacing.....................................6-25
HHandlebar switches.................................. 3-3
Headlight bulb, replacing........................6-26
Helmet holder............................................ 3-8
High beam indicator light .......................... 3-2
Horn switch............................................... 3-4IIdentification numbers.............................. 9-1
Indicator lights........................................... 3-2KKey identification number......................... 9-1
Kickstarter................................................ 3-7LLuggage hook........................................... 3-9MMain switch/steering lock......................... 3-1
Model label................................................ 9-2PPanels, removing and installing................ 6-6
Parking...................................................... 5-4
Part locations............................................ 2-1
Periodic maintenance and lubrication
chart ........................................................ 6-3
Pre-operation check list........................... 4-2
Rear brake lever free play, adjusting .....6-18SSafe-riding points...................................... 1-4
Safety information..................................... 1-1
Seat ........................................................... 3-7
Sidestand................................................3-10
Sidestand switch operation check .........3-10Spark plug, checking................................ 6-7
Specifications............................................ 8-1
Speedometer unit..................................... 3-3
Start switch............................................... 3-4
Starting a cold engine ............................... 5-1
Starting off ................................................. 5-2
Storage...................................................... 7-3
Storage compartment............................... 3-8
TTail/brake light bulb, replacing ................6-27
Throttle cable free play, adjusting..........6-14
Throttle grip and cable, checking and lubricat-
ing ..........................................................6-21
Tires........................................................6-15
Tool kit ....................................................... 6-1
Troubleshooting......................................6-29
Troubleshooting chart.............................6-30
Turn signal indicator light.......................... 3-2
Turn signal light bulb (front), replacing ...6-28
Turn signal switch ..................................... 3-4VValve clearance......................................6-14
Vehicle identification number .................... 9-1WWheel bearings, checking ......................6-23
Wheels....................................................6-17
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