2011 YAMAHA CYGNUS 125 belt

TABLE OF CONTENTSSAFETY INFORMATION .................... 1-1
Further safe-riding points ................. 1-5
DESCRIPTION .................................... 2-1
Left view ........................................... 2-1
Right view......................................... 2-2
Controls and instruments ................. 2-3
INSTRUMENT AND CONTROL FUNC-
TIONS.................................................. 3-1
Main switch/steering lock ................. 3-1
Keyhole cover .................................. 3-2
Indicator and warning lights ............. 3-2
Speedometer.................................... 3-3
Multi-function display........................ 3-3
Handlebar switches .......................... 3-5
Front brake lever .............................. 3-6
Rear brake lever............................... 3-6
Fuel tank cap.................................... 3-7
Fuel .................................................. 3-7
Catalytic converters.......................... 3-9
Kickstarter ........................................ 3-9
Seat ................................................ 3-10
Storage compartments ................... 3-10
Sidestand ....................................... 3-11
Ignition circuit cut-off system .......... 3-12
FOR YOUR SAFETY - PRE-OPERATION
CHECKS ............................................. 4-1OPERATION AND IMPORTANT RIDING
POINTS ............................................... 5-1
Starting the engine ........................... 5-1
Starting off ........................................ 5-2
Acceleration and deceleration .......... 5-2
Braking ............................................. 5-2
Tips for reducing fuel consumption .. 5-3
Engine break-in ................................ 5-3
Parking ............................................. 5-4
PERIODIC MAINTENANCE AND AD-
JUSTMENT ......................................... 6-1
Owner’s tool kit................................. 6-2
Periodic maintenance chart for the
emission control system ............... 6-3
General maintenance and lubrication
chart .............................................. 6-4
Removing and installing panels ....... 6-7
Checking the spark plug................... 6-8
Engine oil and oil strainer ............... 6-10
Final transmission oil...................... 6-12
Air fi lter and V-belt case air fi lter
elements ..................................... 6-13
Checking the throttle grip free
play ............................................. 6-15
Valve clearance.............................. 6-15
Tires ............................................... 6-16
Cast wheels.................................... 6-17
Checking the brake lever free
play ............................................. 6-18Adjusting the rear brake lever free
play ............................................. 6-18
Checking the front brake pads and
rear brake shoes ......................... 6-19
Checking the brake fl uid level ........ 6-19
Changing the brake fl uid ................ 6-20
Checking and lubricating the
cables ......................................... 6-21
Checking and lubricating the throttle grip
and cable .................................... 6-21
Lubricating the front and rear brake
levers .......................................... 6-21
Checking and lubricating the
centerstand and sidestand.......... 6-22
Checking the front fork ................... 6-23
Checking the steering .................... 6-23
Checking the wheel bearings ......... 6-24
Battery ............................................ 6-24
Replacing the fuses........................ 6-26
Replacing the headlight bulb .......... 6-27
Replacing a front turn signal light
bulb ............................................. 6-28
Replacing the tail/brake light bulb or a
rear turn signal light bulb ............ 6-28
Replacing an auxiliary light bulb..... 6-29
Troubleshooting ............................. 6-29
Troubleshooting chart .................... 6-31
SCOOTER CARE AND STORAGE .... 7-1
Matte color caution ........................... 7-1
Care ................................................. 7-1
2('KPFF
J`.,*f J`.,Q/f2J`.,`oJ`.,I\6"

1
2
3
4
5
6
7
8
9
6-4
EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
EAU17717
General maintenance and lubrication chartNO. ITEM CHECK OR MAINTENANCE JOBODOMETER READING
ANNUAL
CHECK
1000 km
(600 mi)6000 km
(3500 mi)
12000 km
(7000 mi)18000 km
(10500 mi)24000 km
(14000 mi)
1 Air lter element• Replace.
√√√√
2*V-belt case air lter el-
ement• Clean.
• Replace if necessary.√√√√
3 * Front brake• Check operation, fl uid level and vehicle for fl uid leakage.
√√√√√ √
• Replace brake pads. Whenever worn to the limit
4 * Rear brake• Check operation and adjust brake lever free play.
√√√√√ √
• Replace brake shoes. Whenever worn to the limit
5 * Brake hose• Check for cracks or damage.
√√√√ √
• Replace. Every 4 years
6 * Wheels• Check runout and for damage.
√√√√
7 * Tires• Check tread depth and for damage.
• Replace if necessary.
• Check air pressure.
• Correct if necessary.√√√√ √
8 * Wheel bearings• Check bearing for looseness or damage.
√√√√
9 * Steering bearings• Check bearing assemblies for looseness.
• Moderately repack with lithium-soap-based grease every
12000 km (7000 mi) or 24 months.√√Re-
pack√Re-
pack√
10 * Chassis fasteners• Make sure that all nuts, bolts and screws are properly
tightened.√√√√ √
11Front brake lever pivot
shaft• Lubricate with silicone grease.
√√√√ √
2('KPFF
J`.,*f J`.,Q/f2J`.,`oJ`.,I\6"

1
2
3
4
5
6
7
8
9
6-5
EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENTNO. ITEM CHECK OR MAINTENANCE JOBODOMETER READING
ANNUAL
CHECK
1000 km
(600 mi)6000 km
(3500 mi)
12000 km
(7000 mi)18000 km
(10500 mi)24000 km
(14000 mi)
12Rear brake lever pivot
shaft• Lubricate with lithium-soap-based grease.
√√√√ √
13 Sidestand, centerstand• Check operation.
• Lubricate.√√√√ √
14 * Sidestand switch• Check operation.
√√√√√ √
15 * Front fork• Check operation and for oil leakage.
√√√√
16 *Shock absorber as-
sembly• Check operation and shock absorber for oil leakage.
√√√√
17 Engine oil• Change. (See page 6-10.)
• Check oil level and vehicle for oil leakage.√Every 3000 km (1800 mi)
18 * Engine oil strainer• Clean.
√Every 6000 km (3500 mi)
19 Final transmission oil• Check vehicle for oil leakage.
• Change.√√√√√ √
20 * V-belt• Replace. Every 18000 km (10500 mi)
21 *Front and rear brake
switches• Check operation.
√√√√√ √
22Moving parts and ca-
bles• Lubricate.
√√√√ √
23 * Throttle grip• Check operation.
• Check throttle grip free play, and adjust if necessary.
• Lubricate cable and grip housing.√√√√ √
24 *Lights, signals and
switches• Check operation.
• Adjust headlight beam.√√√√√ √
2('KPFF
J`.,*f J`.,Q/f2J`.,`oJ`.,I\6"

1
2
3
4
5
6
7
8
9
6-6
EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
EAUT2710
TIP● Air fi lter and V-belt fi lter
• This model’s air fi lter is equipped with a disposable oil-coated paper element, which must not be cleaned with
compressed air to avoid damaging it.
• The air fi lter element needs to be replaced and V-belt fi lter needs to be serviced more frequently when riding in
unusually wet or dusty areas.● Hydraulic brake service
• After disassembling the brake master cylinder and caliper, always change the fl uid. Regularly check the brake
fl uid level and fi ll the reservoir as required.
• Every two years replace the internal components of the brake master cylinder and caliper, and change the brake
fl uid.
• Replace the brake hose every four years and if cracked or damaged.
2('KPFF
J`.,*f J`.,Q/f2J`.,`oJ`.,I\6"

1
2
3
4
5
6
7
8
9
6-13
EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENTRecommended nal transmission
oil:
See page 8-1.
Oil quantity:
0.11 L (0.12 US qt, 0.10 Imp.qt)8. Install the fi nal transmission oil
fi ller cap and its new O-ring, and
then tighten the oil fi ller cap.
9. Check the fi nal transmission case
for oil leakage. If oil is leaking,
check for the cause.
EAUT3120
Air lter and V-belt case air
lter elementsThe air fi lter and V-belt case air fi lter
elements should be cleaned at the in-
tervals specifi ed in the periodic main-
tenance and lubrication chart. Check
both fi lter elements more frequently
if you are riding in unusually wet or
dusty areas. The air fi lter check hoses
must be frequently checked and
cleaned if necessary.
Replacing the air lter element
1. Place the scooter on the center-
stand.2. Remove the air fi lter case cover
by removing the screws.
ZAUM00**
1
2(✕6)
1. Air fi lter case cover
2. Screw3. Pull the air fi lter element out.
4. Insert a new air fi lter element into
the air fi lter case.
NOTICE:
Make
sure that the air lter element
is properly seated in the air
lter case. The engine should
never be operated without
the air lter element installed,
otherwise the piston(s) and/or
cylinder(s) may become exces-
sively worn.
[ECA10481]
5. Install the air fi lter case cover by
installing the screws.
2('KPFF
J`.,*f J`.,Q/f2J`.,`oJ`.,I\6"

1
2
3
4
5
6
7
8
9
6-14
EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
Cleaning the air lter check hoses
1. Check the hoses on the front and
rear side of the air fi lter case for
accumulated dirt or water.ZAUM00**
1
1
1. Air fi lter check hose2. If dirt or water is visible, remove
the hoses, clean them, and then
install them.Cleaning the V-belt case air lter
element
1. Remove the V-belt air fi lter case
cover by removing the screws.
ZAUM00**
1
1. V-belt air fi lter case cover2. Remove the fi lter element holder
by removing the screw.ZAUM00**
1
1. Air fi lter element holder
3. Pull the air fi lter element out, and
then clean it with solvent. After
cleaning, remove the remain-
ing solvent by squeezing the
element. WARNING! Use only a
dedicated parts cleaning sol-
vent. To avoid the risk of re or
explosion, do not use gasoline
or solvents with a low ash
point.
[EWA10431]
NOTICE:
To avoid
damaging the air lter element,
handle it gently and carefully,
and do not twist it.
[ECA10521]
ZAUM00**
1
1. V-belt case air fi lter element4. Apply oil of the recommended
type to the entire surface of
the sponge material, and then
squeeze the excess oil out.
2('KPFF
J`.,*f J`.,Q/f2J`.,`oJ`.,I\6"

1
2
3
4
5
6
7
8
9
6-15
EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENTTIPThe air fi lter element should be wet
but not dripping.Recommended oil:
Yamaha foam air fi lter 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 fi lter 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**
1
1. Throttle cable free play
2('KPFF
J`.,*f J`.,Q/f2J`.,`oJ`.,I\6"

1
2
3
4
5
6
7
8
9
8-1
SPECIFICATIONS SPECIFICATIONS
EAU50910
DimensionsOverall length
1855 mm (73.0 in)
Overall width
685 mm (27.0 in)
Overall height
1130 mm (44.5 in)
Seat height
785 mm (30.9 in)
Wheelbase
1295 mm (51.0 in)
Ground clearance
113 mm (4.45 in)
Minimum turning radius
1900 mm (74.8 in)WeightCurb weight
120 kg (265 lb)EngineEngine type
Air cooled 4-stroke, SOHC
Cylinder arrangement
Single cylinder
Displacement
125 cm
3
Bore x stroke
52.4 x 57.9 mm (2.06 x 2.28 in)
Compression ratio
10.00 :1
Starting system
Electric starter and kickstarter
Lubrication system
Wet sump
Engine oilRecommended brand
YAMALUBE
Type
SAE 10W-30, 10W-40, 10W-50, 15W-40,
20W-40 or 20W-50
–20 –10 0
1020 30 40 50 ˚C 10 30 50 70 90 110 0 130 ˚F
SAE 10W-30
SAE 15W-40SAE 20W-40SAE 20W-50
SAE 10W-40SAE 10W-50
Recommended engine oil grade
API service SG type or higher, JASO
standard MAEngine oil quantityPeriodic oil change
0.90 L (0.95 US qt, 0.79 Imp.qt)Final transmission oilType
SAE 10W-30 type SE motor oil
Quantity
0.11 L (0.12 US qt, 0.10 Imp.qt)Air lterAir fi lter element
Wet elementFuelRecommended fuel
Regular unleaded gasoline onlyFuel tank capacity
7.4 L (1.96 US gal, 1.63 Imp.gal)
Throttle bodyID mark
4P91 00
Manufacturer
MIKUNISpark plug(s)Manufacturer/model
NGK/CR7E
Spark plug gap
0.7-0.8 mm (0.028-0.031 in)ClutchClutch type
Dry, centrifugal automaticTransmissionPrimary reduction ratio
1.000
Secondary reduction ratio
9.744 (38/13 40/12)
Final drive
Gear
Transmission type
V-belt automaticChassisFrame type
Backbone
Caster angle
27.00 degree
Trail
90 mm (3.5 in)Front tireType
Tubeless
2('KPFF
J`.,*f J`.,Q/f2J`.,`oJ`.,I\6"