2012 YAMAHA CYGNUS 125 engine

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EAU15943
OPERATION AND IMPORTANT RIDING POINTS
EAU16820
Tips for reducing fuel con-
sumptionFuel consumption depends largely on
your riding style. Consider the follow-
ing tips to reduce fuel consumption:● Avoid high engine speeds during
acceleration.● Avoid high engine speeds with no
load on the engine.● Turn 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 cross-
ings).
EAU16830
Engine break-inThere is never a more important pe-
riod in the life of your engine than the
period between 0 and 1000 km (600
mi). For this reason, you should read
the following material carefully.
Since the engine is brand new, do not
put an excessive load on it for the fi rst
1000 km (600 mi). The various parts
in the engine wear and polish them-
selves to the correct operating clear-
ances. During this period, prolonged
full-throttle operation or any condition
that might result in engine overheating
must be avoided.
EAU16951
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 fi ve 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.
NOTICE:
After 1000 km
(600 mi) of operation, the engine oil
must be changed and the oil strain-
er cleaned.
[ECA10351]
1000 km (600 mi) and beyond
Avoid prolonged full-throttle operation.
Vary the speed occasionally.
ECA10270
NOTICEIf any engine trouble should occur
during the engine break-in period,
immediately have a Yamaha dealer
check the vehicle.
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EAU15943
OPERATION AND IMPORTANT RIDING POINTS
EAU17213
ParkingWhen parking, stop the engine, and
then remove the key from the main
switch.
EWA10311
WARNING
● Since the engine and exhaust
system can become very hot,
park in a place where pedestri-
ans or children are not likely to
touch them and be burned.● Do not park on a slope or on
soft ground, otherwise the ve-
hicle may overturn, increasing
the risk of a fuel leak and re.● Do not park near grass or other
flammable materials which
might catch re.
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6-1
EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
EAUS1823
Periodic inspection, adjustment, and
lubrication will keep your vehicle in
the safest and most effi cient condition
possible. Safety is an obligation of
the vehicle owner/operator. The most
important points of vehicle inspection,
adjustment, and lubrication are ex-
plained on the following pages.
The intervals given in the periodic
maintenance charts should be simply
considered as a general guide under
normal riding conditions. However,
depending on the weather, terrain,
geographical location, and individual
use, the maintenance intervals may
need to be shortened.
EWA10321
WARNING
Failure to properly maintain the
vehicle or performing maintenance
activities incorrectly may increase
your risk of injury or death during
service or while using the vehicle.
If you are not familiar with vehicle
service, have a Yamaha dealer per-
form service.
EWA15122
WARNING
Turn off the engine when perform-
ing maintenance unless otherwise
speci ed.● A running engine has moving
parts that can catch on body
parts or clothing and electrical
parts that can cause shocks or
res.● Running the engine while ser-
vicing can lead to eye injury,
burns, fire, or carbon monox-
ide poisoning - possibly lead-
ing to death. See page 1-2 for
more information about carbon
monoxide.
EWA10330
WARNING
This scooter is designed for use
on paved roads only. If this scooter
is operated in abnormally dusty,
muddy or wet conditions, the air
lter element should be cleaned or
replaced more frequently, other-
wise rapid engine wear may result.
Consult a Yamaha dealer for proper
maintenance intervals.
EWA15460
WARNING
Brake discs, calipers, drums, and
linings can become very hot dur-
ing use. To avoid possible burns,
let brake components cool before
touching them.
EAU17302
Emission controls not only function
to ensure cleaner air, but are also
vital to proper engine operation and
maximum performance. In the follow-
ing periodic maintenance charts, the
services related to emissions control
are grouped separately. These serv-
ices require specialized data, knowl-
edge, and equipment. Maintenance,
replacement, or repair of the emission
control devices and systems may be
performed by any repair establishment
or individual that is certifi ed (if applica-
ble). Yamaha dealers are trained and
equipped to perform these particular
services.
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EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
EAU46871
TIP● The annual checks must be performed every year, except if a kilometer-based maintenance, or for the UK, a
mileage-based maintenance, is performed instead.● From 30000 km (17500 mi), repeat the maintenance intervals starting from 6000 km (3500 mi).● Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools, data and
technical skills.
EAU46920
Periodic maintenance chart for the emission control systemNO. 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 * Fuel line• Check fuel hoses for cracks or damage.
√√√√ √
2 Spark plug• Check
• Clean and regap.√√
• Replace.
√√
3 * Valves• Check valve clearance.
• Adjust.√√√√
4 * Fuel injection• Check engine idele speed.
√√√√√ √
5*
Air induction system• Check the air cut-off valve, reed valve, and hose for
damage.
• Replace any damaged parts if necessary.√√√√ √
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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 with lithium-soap-based grease.√√√√ √
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.√√√√√ √
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EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
Panel C
To remove the panel
Remove the screws, and then take
the panel off.ZAUM00**
2(✕4)
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1. Panel C
2. ScrewTo install the panel
Place the panel in the original posi-
tion, and then install the screws.Panel D
To remove the panel
1. Open the seat. (See page 3-10.)
ZAUM00**
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1. Panel D
2. Screw2. Remove the quick fasteners by
pushing in the center pin, and
then take the panel off.
To install the panel
Place the panel in the original posi-
tion, and then install quick fasteners.
EAUT1835
Checking the spark plugThe spark plug is an important engine
component, which is easy to check.
Since heat and deposits will cause
any spark plug to slowly erode, the
spark plug should be removed and
checked in accordance with the pe-
riodic maintenance and lubrication
chart. In addition, the condition of the
spark plug can reveal the condition of
the engine.
To remove the spark plug
1. Place the vehicle on the center-
stand.
2. Remove panel C. (See page 6-8.)
3. Remove the spark plug cap.
4. Remove the spark plug as
shown, with the spark plug
wrench included in the owner’s
tool kit.
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EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENTZAUM00**
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1. Spark plug wrenchTo check the spark plug
1. Check that the porcelain insula-
tor around the center electrode
of the spark plug is a medium-to-
light tan (the ideal color when the
vehicle is ridden normally).TIPIf the spark plug shows a distinctly
different color, the engine could be
operating improperly. Do not attempt
to diagnose such problems yourself.
Instead, have a Yamaha dealer check
the vehicle.
2. Check the spark plug for elec-
trode erosion and excessive carbon or other deposits, and re-
place it if necessary.
Speci ed spark plug:
CR7E (NGK)To install the spark plug
1. Measure the spark plug gap with
a wire thickness gauge and, if
necessary, adjust the gap to
specifi cation.ZAUM00**
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1. Spark plug gapSpark plug gap:
0.7 ~ 0.8 mm (0.028 ~ 0.031 in)2. Clean the surface of the spark
plug gasket and its mating sur-
face, and then wipe off any grime
from the spark plug threads.
3. Install the spark plug with the
spark plug wrench, and then
tighten it to the specifi ed torque.Tightening torque:
Spark plug:
13 Nm (1.3 m·kgf, 9.4 ft·lbf)TIPIf a torque wrench is not available
when installing a spark plug, a good
estimate of the correct torque is 1/4 ~
1/2 turn past fi nger tight. However, the
spark plug should be tightened to the
specifi ed torque as soon as possible.
4. Install the spark plug cap.
5. Install the panel.
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EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
EAUT1352
Engine oil and oil strainerThe engine oil level should be
checked before each ride. In addition,
the oil must be changed and the oil
strainer cleaned at the intervals speci-
fied in the periodic maintenance and
lubrication chart. The engine oil must
also be changed at the initial 1000 km
(600 mi) and when the oil change indi-
cator fl ashes. The oil change tripmeter
must be reset after the initial 1000 km
(600 mi). (See page 3-3 for reset pro-
cedures.)
To check the engine oil level
1. Place the vehicle on the center-
stand. A slight tilt to the side can
result in a false reading.
2. Start the engine, warm it up for
several minutes, and then turn it
off.
3. Wait a few minutes until the oil
settles, remove the oil filler cap,
wipe the dipstick clean, insert it
back into the oil fi ller hole (without
screwing it in), and then remove it
again to check the oil level.
TIPThe engine oil should be between the
minimum and maximum level marks.ZAUM00**
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1. Maximum level mark
2. Minimum level mark4. If the engine oil is below the mini-
mum level mark, add suffi cient oil
of the recommended type to raise
it to the correct level.
5. Insert the dipstick into the oil fi ller
hole, and then tighten the oil fi ller
cap.
To change the engine oil and clean
the oil strainer
1. Start the engine, warm it up for
several minutes, and then turn it off.
2. Place an oil pan under the engine
to collect the used oil.
3. Remove the engine oil filler cap
and drain bolts to drain the oil
from the crankcase.
NOTICE:

When removing the engine oil
drain bolt, the O-ring, spring,
and oil strainer will fall out.
Take care not to lose these
parts.
[ECA10411]
ZAUM00**
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1. Oil fi ller cap
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