2006 YAMAHA CYGNUS 125 engine

WARNING

1.Never start the engine in a closed
environment. The exhaust fumes are
poisonous which may cause loss of
consciousness and death within a
short time. Operate the motorcycle
always with adequate ventilation.
2.Make sure that the side-stand has
been back to its original position be-
fore riding; otherwise, serious acci-
dent may occur when turning.
3.After warming the engine, hold the
fixed bracket by right hand and push
the motorcycle off the center-stand.
4.Sit astride the seat and adjust the
rear view mirrors.
5.Check the oncoming traffic; switch
on the turn signal before starting off.
RUNNING AND OPERATION
6.Turn the throttle grip on the right
handlebar slowly to take off, switchoff the turn signal.■ ■■ ■
■Shut-down the engine and
park the motorcycleWhen stopping, turn the main switch
to position OFF.
WARNING

Since the exhaust pipe of muffle
may become extremely hot, you
should park the motorcycle in a
place where pedestrians or children
are unlikely to come in contact with
the vehicle. Do not park on a slope
or soft ground, otherwise the mo-torcycle may overturn.
5-2

OPERATION AND IMPORTANT RIDING POINTS■ ■■ ■
■Engine exhaustWe take the environmental protection
into consideration maturely, our mo-
torcycles are equipped with AIS sys-
tem and agent catalyzing device in the
exhaust pipe, and can meet the re-
quirement of Europe II emission
standard.
Massive incomplete combusted gas
mixture will re-combust when flowing
into the hot agent catalyzing device,
thus causes exhaust pipe overheat-
ing and shortens the service life of
catalyzing device. To prevent this kind
of situation and other damages,
please read the following list carefully.
CAUTION:

. Only use unleaded fuels (#93 un-
leaded petrol). The leaded petrol will
cause the catalyzing device be-
come contaminated and rendered
useless.. When riding, do not turn off the
main switch. Otherwise, it will pro-
duce massive incomplete com-
busted gases.. If the ignition or fuel system is
out of condition, the agent cata-
lyzing device will overheat.. Be careful when the motorcycle
rides for a period of time, the out-
side of exhaust pipe will be very hot.. Do not splash or overfill the fuel
to the exhaust pipe when re-fueling.
It may burn when the petrol drippedto hot exhaust pipe.
5-3
WARNING

Do not ride or park your motorcycle
over inflammable material (like
mow or something else) to avoidfire hazard.

PRE-OPERATION CHECKS
1 Pre-operation checks6-1
2 Brake lever free travel6-2
3 Brake fluid6-2
4 Engine oil level6-2
5 Petrol level6-3
6 Throttle grip6-3
7 Tyre6-3
8 Lights and signal light6-3
9 Switches6-3

Before riding the motorcycle, you should check the following items:PRE-OPERATION CHECKS■ ■■ ■
■Pre-operation checksNOTE:
Carry out the pre-operation checks every time you ride the motorcycle. It takes only a little of time to inspect the items
listed above, but the value of consequent safety is much more than the time cost.
If you find any of the items listed above is not qualified or can not run well, clean up hazards before riding. Seek
help from your YAMAHA agency if necessary.
Front brake (disk brake)
(drum brake)
Rear brake
Throttle grip
Engine oil
Tires and tyre casing
The steel wires
Brake lever pivot
Center/side stand shaft
Tightness
Fuel tank
Lights and signal lights
ItemDescription
Action, free gap, brake fluid level and leakage, refuel if necessary
Action, free gap, adjust if necessary
Action, free gap, adjust if necessary
Operation, lubricate and adjust if necessary
Oil level, refuel if necessary
Tyre pressure, wear and deflection
Action, lubricate if necessary
Action, lubricate if necessary
Check the tightness of the bolts and nuts which connect the parts, tighten if necessary
Oil level, refuel if necessary
Action, repair if necessary
WARNING
6-1
Action, lubricate if necessary

WARNING

If the brake lever fails, do not ride
the motorcycle before
troubleshooting, and ask your
YAHAMA agency to repair the brake.
Soft brake means troubles in thebrake system.front brake lever
Hold the brake lever for a few minutes
to check leakage in the brake pipe joint
or main cylinder. If leakages detected,
ask your agency to repair it
immediately. The leakage of brake
fluid means troubles in brake system.■ ■■ ■
■Engine oil level1.Uphold the motorcycle by center-stand.■ ■■ ■
■Brake fluid (disk brake)If the oil level is below the LOWER
signal, take your motorcycle to the
agency for refueling.
■ ■■ ■
■Brake lever free travel
rear brake lever
drum brake disk brake
drum brake
PRE-OPERATION CHECKS
Rear brake
Front disk brake(idle motion)
Travel
10-20mm
Front drum brake
10-20mm
10-20mm
NOTE: When checking the engine oil level,
the motorcycle must be upright. Even
a small incline will cause fault result
of inspection.
This inspection should be took when
you buying the vehicle or every1,000 km mileage.
2.Start the engine and warm the ve-
hicle for a few minutes, then shut off
the engine.
3.Wait a few minutes, so that the en-
gine oil flows back, take the oil dip rod
out of the crankcase, clean the rod,
put it back to the dipstick hole (do not
turn around), take it out again to check
the oil level.Oil replaced periodically
Oil replaced periodically(including the oil needed for
replacing filter element)Special engine oil used
for four-stroke motor-
cycle
YAHAMA Four-stroke
YAMALUBE engine oil,
SAE 20W-40 combustion
engine oil (API) , Spec. SF1.0L
1.2L
1.upper limit 2.lower limit
6-2
front (right)
rear (left)
1
2

MAINTENANCE
1 Periodical maintenance7-1
2 Tool kits7-3
3 Replace engine oil7-3
4 Gear oil7-5
5 Air filter7-5
6 Crankcase filter7-6
7 Adjust mixing ratio7-6
8 Adjust idle speed7-7

Periodical maintenance/lubrication table
MAINTENANCE


Periodical maintenanceSee detailed description and time requirement for the general periodical maintenance of motorcycle and exhaust gas
control system in the "Consumer Manual".
The information supplied in this chapter is some kind of easy maintenance which can be finished by consumer him/
herself. If you are not familiar with the repair and maintenance procedure, ask the agency to finish it.
Items
Air drain*
Ignition plugCheck the clearance, adjust if necessary.
1,500km or 2 months
DescriptionRunning-in
500km
Check the working condition, clean or replace if necessary.
Air filterClean every 1,000km, replace if necessary.
Carburetor*Check idle speed/start operation, adjust if necessary.
Check the fuel tube (or vacuum tube) for crackles or damages, replace if necessary.
Fuel line*
Engine oil
Replace (warming engine before exhausting)
Engine oil filter*
Crankcase filter*
Clean every 1,000km, replace if necessary. Clean, replace if necessary.
Gear oil*Check leakage, replace every 3,000km.Front brake*(dish brake)
Check action/brake fluid leakage, see "Note". Replace if necessary.
Front brake(drum brake)
Check action, replace if necessary.
1,500km or 2 months
At the firstEvery
Check action, replace if necessary.
Lubricate a little. **
Check wearing and damage. Repair if necessary.
Check the fastening/damages of the bearing assembly, replace when there are damages.
Rear brake
Wheel
Wheel bearing* Front shaft
7-1

■ ■■ ■
■Tool kitsService information included in this
manual and the tool kits provided will
help you perform the maintenance and
minor repairs. However, additional
tools such as a torque wrench to fas-
ten the nuts or screws may be neces-
sary for correctly performing certain
maintenance work.
WARNING

Modification without approval of
our company may affect the func-
tion of the motorcycle, and renderhazards.
MAINTENANCE
1.fuel drain plug 2.spring
3.filter screen 4.O-ringCAUTION:

When removing the drain plug, the
spring, the filter screen and O-ring
will fall out, do not lose any of thecomponents.
■ ■■ ■
■Replace engine oil1.Start the engine and warm the
vehicle for a few minutes, then shut
off the engine.
2.Place an oil pan under the engine
to collect the engine oil used.
3.Remove the drain bolt.
7-3
1. tool kits
12
4
1 3