2000 YAMAHA CYGNUS 125 check engine light

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EAU10210
TABLE OF CONTENTSSAFETY 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/steering lock ..... 3-1
Indicator lights ...................... 3-2
Speedometer unit................. 3-3
Fuel gauge ............................ 3-3
Handlebar switches .............. 3-3
Front brake lever .................. 3-4
Rear brake lever ................... 3-4
Fuel tank cap ........................ 3-5
Fuel...................................... 3-6
Catalytic converter ............... 3-6
Kickstarter............................ 3-7
Seat ......................................3-7
Helmet holder ....................... 3-8
Storage compartment ........... 3-8
Luggage hook ....................... 3-9
Sidestand ...........................3-10Sidestand switch operation
check...............................3-10
PRE-OPERATION CHECKS . 4-1
Pre-operation check list ........ 4-2
OPERATION AND IMPORTANT
RIDING POINTS.................... 5-1
Starting a cold engine ........... 5-1
Starting off ............................ 5-2
Acceleration and
deceleration....................... 5-2
Braking ................................. 5-2
Tips for reducing fuel consump-
tion..................................... 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 ....... 6-7Engine oil and oil strainer ...... 6-8
Final transmission oil..........6-10
Air filter and V-belt case air filter
elements..........................6-11
Adjusting the carburetor..... 6-13
Adjusting the throttle cable free
play ..................................6-14
Adjusting the valve
clearance.........................6-14
Tires...................................6-15
Cast wheels.......................6-17
Checking the front brake lever
free play...........................6-17
Adjusting the rear brake lever
free play...........................6-18
Checking the front brake pads
and rear brake shoes ......6-18
Checking the brake fluid
level .................................6-19
Changing the brake fluid .....6-20
Checking and lubricating the
cables..............................6-20
Checking and lubricating the
throttle grip and cable ......6-21
Lubricating the front and rear
brake levers.....................6-21
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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.
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PERIODIC MAINTENANCE AND MINOR REPAIR
EAUT1170
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 periodic mainte-
nance and lubrication char t. In addition,
the condition of the spark plug can re-
veal the condition of the engine.
To remove the spark plug
1. Remove panel C. (See page 6-6.)
2. Remove the spark plug cap.
3. Remove the spark plug as shown,
with the spark plug wrench included
in the owner’s tool kit.ZAUM00**1
1. Spark plug wrench
To check the spark plug
1. Check that the porcelain insulator
around the center electrode of the
spark plug is a medium-to-light tan
(the ideal color when the vehicle is
ridden normally).NOTE:
If the spark plug shows a distinctly dif-
ferent color, the engine could be defec-
tive. Do not attempt to diagnose such
problems yourself. Instead, have a
Yamaha dealer check the vehicle.2. Check the spark plug for electrode
erosion and excessive carbon or
other deposits, and replace it if nec-
essary.
Specified spark plug:
CR7E (NGK)
To install the spark plug
1. Measure the spark plug gap with a
wire thickness gauge and, if nec-
essary, adjust the gap to specifi-
cation.
ZAUM00**
12(×4)
1. Panel B
2. ScrewTo install the panel
Place the panel in the original position,
and then install the screws.
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PERIODIC MAINTENANCE AND MINOR REPAIRZAUM00**
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1. Spark plug gap
Spark plug gap:
0.6~0.7 mm (0.024~0.028 in)
2. Clean the surface of the spark plug
gasket and its mating surface, 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 specified torque.
Tightening torque:
Spark plug:
13 Nm (1.3m  kgf, 9.4ft  lbf)
NOTE:
If 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
finger tight. However, the spark plug
should be tightened to the specified
torque as soon as possible.4. Install the spark plug cap.
5. Install the panel.
EAUT1350
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 specified 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 indicator changes from green
to red. The oil change indicator must be
reset after the initial 1000 km (600 mi).
(See page 3-2 for reset procedures.)
To check the engine oil level
1.Place the vehicle on the centerstand.NOTE:
Make sure that the vehicle is positioned
straight up when checking the oil level.
A slight tilt to the side can result in a
false reading.2. Start the engine, warm it up for sev-
eral minutes, and then turn it off.
3. Wait a few minutes until the oil
settles, remove the oil filler cap,
wipe the dipstick clean, inser t it
back into the oil filler hole (without
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INDEXAAcceleration and deceleration.................. 5-2
Air filter and V-belt case air filter
elements................................................6-11BBattery.....................................................6-23
Brake fluid level, checking ......................6-19
Brake fluid, changing ..............................6-20
Brake lever, front ...................................... 3-4
Brake lever, rear....................................... 3-4
Brake levers, lubricating.........................6-21
Brake pads and shoes, checking..........6-18
Braking...................................................... 5-2CCables, checking and lubricating ...........6-20
Carburetor,adjusting...............................6-13
Catalytic converter................................... 3-6
Centerstand and sidestand, checking and lu-
bricating.................................................6-21DDimmer switch.......................................... 3-4EEngine break-in ......................................... 5-3
Engine oil and oil strainer .......................... 6-8FFinal transmission oil ..............................6-10
Front brake lever free play, checking....6-17
Fuel........................................................... 3-6
Fuel consumption, tips for reducing ......... 5-3
Fuel gauge ................................................ 3-3
Fuel tank cap ............................................ 3-5
Fuses, replacing.....................................6-25
HHandlebar switches.................................. 3-3
Headlight bulb, replacing........................6-26
Helmet holder............................................ 3-8
High beam indicator light .......................... 3-2
Horn switch............................................... 3-4IIdentification numbers.............................. 9-1
Indicator lights........................................... 3-2KKey identification number......................... 9-1
Kickstarter................................................ 3-7LLuggage hook........................................... 3-9MMain switch/steering lock......................... 3-1
Model label................................................ 9-2PPanels, 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
Rear brake lever free play, adjusting .....6-18SSafe-riding points...................................... 1-4
Safety information..................................... 1-1
Seat ........................................................... 3-7
Sidestand................................................3-10
Sidestand switch operation check .........3-10Spark plug, checking................................ 6-7
Specifications............................................ 8-1
Speedometer unit..................................... 3-3
Start switch............................................... 3-4
Starting a cold engine ............................... 5-1
Starting off ................................................. 5-2
Storage...................................................... 7-3
Storage compartment............................... 3-8
TTail/brake light bulb, replacing ................6-27
Throttle cable free play, adjusting..........6-14
Throttle grip and cable, checking and lubricat-
ing ..........................................................6-21
Tires........................................................6-15
Tool kit ....................................................... 6-1
Troubleshooting......................................6-29
Troubleshooting chart.............................6-30
Turn signal indicator light.......................... 3-2
Turn signal light bulb (front), replacing ...6-28
Turn signal switch ..................................... 3-4VValve clearance, adjusting ......................6-14
Vehicle identification number .................... 9-1WWheel bearings, checking ......................6-23
Wheels....................................................6-17
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