2005 YAMAHA CYGNUS 125 Owners Manual

5-3
1
2
3
4
5
6
7
8
9
OPERATION AND IMPORTANT RIDING POINTS
EAU16830
Engine break-inThere is never a more important period
in the life of your engine than the period
between 0 and 1000 km (600 mi). For
this reason, you should read the follow-
ing material carefully.
Since the engine is brand new, do not
put an excessive load on it for the first
1000 km (600 mi). The various parts in
the engine wear and polish themselves
to the correct operating clearances. Dur-
ing this period, prolonged full-throttle
operation or any condition that might
result in engine overheating must be
avoided.
EAU16820
Tips for reducing fuel con-
sumptionFuel consumption depends largely on
your riding style. Consider the following
tips to reduce fuel consumption:
8Avoid high engine speeds during
acceleration.
8Avoid high engine speeds with no
load on the engine.
8Turn the engine off instead of let-
ting it idle for an extended length of
time (e.g., in traffic jams, at traffic
lights or at railroad crossings).
EAU16950
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 five 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.
ECA10350
cCAfter 1000 km (600 mi) of operation,
the engine oil must be changed and
the oil strainer cleaned.1000 km (600 mi) and beyond
Avoid prolonged full-throttle operation.
Vary the speed occasionally.
ECA10270
cCIf any engine trouble should occur
during the engine break-in period,
immediately have a Yamaha dealer
check the vehicle.
5ML-F8199-E1ch5.pmd2004/10/04, 20:08 3

5-4
1
2
3
4
5
6
7
8
9
OPERATION AND IMPORTANT RIDING POINTS
EAU17212
ParkingWhen parking, stop the engine, and then
remove the key from the main switch.
EWA10310
w8 88 8
8Since the engine and exhaust
system can become very hot,
park in a place where pedestri-
ans or children are not likely to
touch them.
8 88 8
8Do not park on a slope or on soft
ground, otherwise the vehicle
may overturn.
ECA10380
cCNever park in an area where there are
fire hazards such as grass or other
flammable materials.
5ML-F8199-E1ch5.pmd2004/10/04, 20:08 4

6-1
1
2
3
4
5
6
7
8
9
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.
5ML-F8199-E1ch6.pmd2004/10/04, 20:08 1

6-2
1
2
3
4
5
6
7
8
9
PERIODIC MAINTENANCE AND MINOR REPAIRNOTE:
If you do not have the tools or experi-
ence required for a particular job, have
a Yamaha dealer perform it for you.
EWA10350
wModifications not approved by
Yamaha may cause loss of perfor-
mance and render the vehicle unsafe
for use. Consult a Yamaha dealer be-
fore attempting any changes.
5ML-F8199-E1ch6.pmd2004/10/04, 20:08 2

6-3
1
2
3
4
5
6
7
8
9
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
1
*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
5ML-F8199-E1ch6.pmd2004/10/04, 20:08 3

6-4
1
2
3
4
5
6
7
8
9
PERIODIC MAINTENANCE AND MINOR REPAIR9
*Wheels Check runout and for damage.————
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
assembly Check operation and shock absorber for oil leakage.————
18*Carburetor Adjust engine idling speed.————— —
19*Engine oil Change. (see page 3-2)—Every 3000 km
 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.————— — NO. ITEM CHECK OR MAINTENANCE JOBODOMETER READING (u1,000 km)
ANNUAL
CHECK
1 6 12 18 24
5ML-F8199-E1ch6.pmd2004/10/04, 20:08 4

6-5
1
2
3
4
5
6
7
8
9
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.———— —
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.———— —
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
5ML-F8199-E1ch6.pmd2004/10/04, 20:08 5

6-6
1
2
3
4
5
6
7
8
9
PERIODIC MAINTENANCE AND MINOR REPAIR
EAU18771
Removing and installing pan-
elsThe panels shown above need to be re-
moved to perform some of the mainte-
nance jobs described in this chapter.
Refer to this section each time a panel
needs to be removed and installed.ZAUM00**
1
2
3
1. Panel A
2. Panel B
3. Panel C
EAUT1450
Panel ATo remo
ve the panel
Remove the quick fasteners by push-
ing in the center pin, and then take the
panel off.
ZAUM00**
1
2(×2)
1. Panel B
2. ScrewTo install the panel
Place the panel in the original position,
and then install the screws.
Panel CTo remo
ve the panel
Remove the screws, and then take the
panel off.
ZAUM00**
1
2
1. Panel A
2. Quick fastenerTo install the panel
Place the panel in the original position,
and then install quick fasteners.
Panel BTo remo
ve the panel
Remove the screws, and then take the
panel off.
5ML-F8199-E1ch6.pmd2004/10/04, 20:08 6