2007 YAMAHA CYGNUS 125 belt

TABLE OF CONTENTS
SAFETY 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 ......................................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 ..............................3-7
Fuel tank cap ...................................3-7
Fuel ..................................................3-8
Catalytic converter ...........................3-9
Kickstarter ........................................3-9
Seat .................................................3-9
Storage compartments ..................3-10
Sidestand .......................................3-11
Sidestand switch operation check .3-12
PRE-OPERATION CHECKS
...............4-1
Pre-operation check list ...................4-2
OPERATION 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
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 .................. 6-7
Engine oil and oil strainer ................ 6-9
Final transmission oil ..................... 6-11
Air filter and V-belt case air filter
elements .................................... 6-12
Checking the throttle cable free
play ............................................ 6-14
Valve clearance ............................. 6-14
Tires .............................................. 6-14
Cast wheels ................................... 6-16
Adjusting the rear brake lever free
play ............................................ 6-16
Checking the front brake pads and
rear brake shoes ........................ 6-17Checking the front brake fluid
level ........................................... 6-18
Changing the brake fluid ............... 6-19
Checking and lubricating the
cables ........................................ 6-19
Checking and lubricating the throttle
grip and cable ............................ 6-20
Lubricating the front and rear brake
levers ......................................... 6-20
Checking and lubricating the
centerstand and sidestand ........ 6-20
Checking the front fork .................. 6-21
Checking the steering ................... 6-21
Checking the wheel bearings ........ 6-22
Battery ........................................... 6-22
Replacing the fuses ...................... 6-24
Replacing the headlight bulb ........ 6-25
Replacing a front turn signal light
bulb ............................................ 6-26
Replacing the tail/brake light bulb or
a rear turn signal light bulb ........ 6-27
Replacing an auxiliary light bulb ... 6-27
Troubleshooting ............................ 6-28
Troubleshooting chart ................... 6-29
SCOOTER CARE AND
STORAGE
........................................... 7-1
Matte color caution .......................... 7-1
Care ................................................ 7-1
Storage ........................................... 7-3

PERIODIC MAINTENANCE AND MINOR REPAIR
6-3
1
2
3
4
5
6
7
8
9

EAU17710
Periodic maintenance and lubrication chart
NOTE:


The annual checks must be performed every year, except if a kilometer-based maintenance is performed in-
stead.

From 30000 km, repeat the maintenance intervals starting from 6000 km.

Items 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 (
×
1000 km)
ANNUAL
CHECK
1 6 12 18 24
1*
Fuel line


Check fuel and vacuum hoses 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.
√√
5
V-belt case air filter ele-
ment

Clean.
√√√√
6*
Front brake

Check operation, fluid level and vehicle for fluid leak-
age.
√√√√√ √

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
9*
Wheels

Check runout and for damage.
√√√√

PERIODIC MAINTENANCE AND MINOR REPAIR
6-4
2
3
4
5
67
8
9

10

*
Tires

Check tread depth and for damage.

Replace if necessary.

Check air pressure.

Correct if necessary.
√√√√ √
11

*
Wheel bearings

Check bearing for looseness or damage.
√√√√
12

*
Steering bearings

Check bearing play and steering for roughness.
√√√√√

Lubricate with lithium-soap-based grease. Every 24000 km
13

*
Chassis fasteners

Make sure that all nuts, bolts and screws are properly
tightened.
√√√√ √
14

Sidestand, centerstand

Check operation.

Lubricate.
√√√√ √
15

*
Sidestand switch

Check operation.
√√√√√ √
16

*
Front fork

Check operation and for oil leakage.
√√√√
17

*
Shock absorber assem-
bly

Check operation and shock absorber for oil leakage.
√√√√
18

*
Fuel injection

Check engine idle speed.
√√√√√ √
19

Engine oil

Change. (See page 6-9.)

Check oil level and vehicle for oil leakage.
√
Every 3000 km
20

*
Engine oil strainer

Clean.
√
21

Final transmission oil

Check vehicle for oil leakage.
√√ √

Change.
√√√
22

*
V-belt

Replace. Every 18000 km
23

*
Front and rear brake
switches

Check operation.
√√√√√ √
24

Moving parts and cables

Lubricate.
√√√√ √
25

*
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.
√√√√ √
NO. ITEM CHECK OR MAINTENANCE JOBODOMETER READING (
×
1000 km)
ANNUAL
CHECK
1 6 12 18 24

PERIODIC MAINTENANCE AND MINOR REPAIR
6-12
2
3
4
5
67
8
9

EAUT1843
Air filter and V-belt case air
filter elements
The air filter and V-belt case air filter el-
ements should be cleaned at the inter-
vals specified in the periodic
maintenance and lubrication chart.
Clean both filter elements more fre-
quently if you are riding in unusually
wet or dusty areas. The air filter check
hoses must be frequently checked and
cleaned if necessary.
Cleaning the air filter element
1. Place the scooter on the center-
stand.
2. Remove the air filter case cover by
removing the screws.3. Pull the air filter element out, and
then blow the dirt out with com-
pressed air as shown.
4. Check the air filter element fordamage and replace it if neces-
sary.
5. Insert the air filter element into the
air filter case.
CAUTION:

ECA10480

Make sure that the air filter ele-
ment is properly seated in the
air filter case.

The 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 in-
stalling the screws.
Cleaning the air filter check hoses
1. Check the hoses on the front and
rear side of the air filter case for ac-
cumulated dirt or water.
2. If dirt or water is visible, remove
the hoses, clean them, and then
install them.
Cleaning the V-belt case air filter el-
ement
1. Remove the V-belt air filter case

1. Air filter case cover
2. Screw
3. Air filter check hose
1. Air filter element
ZAUM00**
1
2(✕6)
3
3
ZAUM00**
1

PERIODIC MAINTENANCE AND MINOR REPAIR
6-13
1
2
3
4
5
6
7
8
9
cover by removing the screws.
2. Remove the filter element holder
by removing the screw.
3. Pull the air filter element out, and
then clean it with solvent. After
cleaning, remove the remainingsolvent by squeezing the element.
WARNING

EWA10430
Use 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.
CAUTION:

ECA10520
To avoid damaging the air filter ele-
ment, handle it gently and carefully,
and do not twist it.
4. 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.
5. Insert the element into the air filter
case.
6. Install the filter element holder by
installing the screw.
7. Install the V-belt air filter case cov-
er by installing the screws.
1. V-belt air filter case cover
1. Air filter element holder
ZAUM00**
1
ZAUM00**
1

1. V-belt case air filter element
ZAUM00**
1

Recommended oil:
Yamaha foam air filter oil or other
quality foam air filter oil

8-1
2
3
4
5
6
7
89

SPECIFICATIONS
EAU2633J
Dimensions:
Overall 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:
115 mm (4.53 in)
Minimum turning radius:
1900 mm (74.8 in)
Weight:
With oil and fuel:
120.0 kg (265 lb)
Engine:
Engine type:
Air cooled 4-stroke, SOHC
Cylinder arrangement:
Forward-inclined single cylinder
Displacement:
125.0 cm
3

Bore
×
stroke:
52.4
×
57.9 mm (2.06
×
2.28 in)
Compression ratio:
10.00 :1
Starting system:
Electric starter and kickstarterLubrication system:
Wet sump

Engine oil:
Type:
SAE20W40
Recommended engine oil grade:
API service SG type or higher, JASO stan-
dard MA
Engine oil quantity:
Periodic oil change:
0.90 L (0.95 US qt) (0.79 Imp.qt)
Final transmission oil:
Type:
SAE10W30 type SE motor oil
Quantity:
0.11 L (0.12 US qt) (0.10 Imp.qt)
Air filter:
Air filter element:
Oil-coated paper element
Fuel:
Recommended fuel:
Regular unleaded gasoline onlyFuel tank capacity:
7.4 L (1.96 US gal) (1.63 Imp.gal)
Fuel injector:
Manufacturer:
AISAN
Model/quantity:
4P91 01 / 1
Spark plug (s):
Manufacturer/model:
NGK/CR7E
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
Clutch:
Clutch type:
Dry, centrifugal automatic
Transmission:
Primary 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 type
Chassis:
Frame type:
Steel tube backbone
Caster angle:
27.00 °
-20 -10 0
10 20 30
40
50 ˚C
SAE 10W-30
SAE 15W-40SAE 20W-40SAE 20W-50
SAE 10W-40

INDEX
A
Acceleration and deceleration................... 5-2
Air filter and V-belt case air filter
elements ............................................... 6-12
Auxiliary light bulb, replacing .................. 6-27
B
Battery..................................................... 6-22
Brake fluid, changing .............................. 6-19
Brake fluid level, checking ...................... 6-18
Brake lever, front....................................... 3-6
Brake lever, rear ....................................... 3-7
Brake levers, lubricating.......................... 6-20
Brake pads and shoes, checking ............ 6-17
Braking ...................................................... 5-2
C
Cables, checking and lubricating ............ 6-19
Care .......................................................... 7-1
Catalytic converter .................................... 3-9
Centerstand and sidestand, checking and
lubricating ............................................. 6-20
D
Dimmer switch .......................................... 3-6
E
Engine break-in ......................................... 5-3
Engine oil and oil strainer.......................... 6-9
Engine trouble warning light...................... 3-3
F
Final transmission oil .............................. 6-11
Front fork, checking ................................ 6-21
Fuel ........................................................... 3-8
Fuel consumption, tips for reducing .......... 5-3
Fuel tank cap ............................................ 3-7
Fuses, replacing...................................... 6-24
H
Handlebar switches ...................................3-5
Headlight bulb, replacing .........................6-25
High beam indicator light ...........................3-2
Horn switch ................................................3-6
I
Identification numbers................................9-1
Indicator and warning lights .......................3-2
K
Keyhole cover ............................................3-2
Key identification number ..........................9-1
Kickstarter ..................................................3-9
M
Main switch ................................................3-1
Matte color, caution ...................................7-1
Model label ................................................9-2
Multi-function display .................................3-3
P
Panels, 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
R
Rear brake lever free play, adjusting .......6-16
S
Safe-riding points .......................................1-4
Safety information ......................................1-1
Seat ...........................................................3-9
Sidestand .................................................3-11
Sidestand switch operation check ...........3-12
Spark plug, checking .................................6-7
Specifications.............................................8-1Speedometer ............................................. 3-3
Starting off ................................................. 5-2
Starting the engine .................................... 5-1
Start switch ................................................ 3-6
Steering, checking ................................... 6-21
Storage ...................................................... 7-3
Storage compartments ............................ 3-10
T
Tail/brake light bulb or rear turn signal
light bulb, replacing ............................... 6-27
Throttle cable free play, checking............ 6-14
Throttle grip and cable, checking and
lubricating .............................................. 6-20
Tires ........................................................ 6-14
Tool kit ....................................................... 6-1
Troubleshooting....................................... 6-28
Troubleshooting chart.............................. 6-29
Turn signal indicator light .......................... 3-2
Turn signal light bulb (front), replacing .... 6-26
Turn signal switch...................................... 3-6
V
Valve clearance ....................................... 6-14
Vehicle identification number .................... 9-1
W
Wheel bearings, checking ....................... 6-22
Wheels .................................................... 6-16