2005 YAMAHA CYGNUS 125 recommended oil

4-2
1
2
3
4
5
6
7
8
9
PRE-OPERATION CHECKS
ITEM CHECKS PAGE
Fuel Check fuel level in fuel tank.
 Refuel if necessary.
 Check fuel line for leakage.3-6
Engine oil Check oil level in engine.
 If necessary, add recommended oil to specified level.
 Check vehicle for oil leakage.6-8
Final transmission oil Check vehicle for oil leakage. 6-10
Front brake Check operation.
 If soft or spongy, have Yamaha dealer bleed hydraulic system.
 Check brake pads for wear.
 Replace if necessary.
 Check fluid level in reservoir.
 If necessary, add recommended brake fluid to specified level.
 Check hydraulic system for leakage.6-18, 6-19
Rear brake Check operation.
 Lubricate cable if necessary.
 Check lever free play.
 Adjust if necessary.6-18, 6-19
Throttle grip Make sure that operation is smooth.
 Check cable free play.
 If necessary, have Yamaha dealer adjust cable free play and lubricate cable and
grip housing.6-14, 6-21
Wheels and tires Check for damage.
 Check tire condition and tread depth.
 Check air pressure.
 Correct if necessary.6-15, 6-17
Brake levers Make sure that operation is smooth.
 Lubricate lever pivoting points if necessary.6-21
EAU15603
Pre-operation check list
5ML-F8199-E1ch4.pmd2004/10/04, 20:08 2

6-9
1
2
3
4
5
6
7
8
9
PERIODIC MAINTENANCE AND MINOR REPAIR
screwing it in), and then remove it
again to check the oil level.
NOTE:
The engine oil should be between the
minimum and maximum level marks.ZAUM00**
1
2
1. Maximum level mark
1. Minimum level mark4. If the engine oil is below the mini-
mum level mark, add sufficient oil
of the recommended type to raise
it to the correct level.
5. Insert the dipstick into the oil filler
hole, and then tighten the oil filler
cap.To change the engine oil and clean
the oil strainer
1. Start the engine, warm it up for sev-
eral 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.
ECA10410
cCWhen removing the engine oil drain
bolt, the O-ring, spring, and oil
strainer will fall out. Take care not to
lose these parts.ZAUM00**
1
1. Oil filler cap
ZAUM00**
1
1. Engine oil drain bolt AZAUM00**
1
1. Engine oil drain bolt B4. Clean the oil strainer with solvent,
and then check it for damage and
replace it if necessary.
5. Check the O-ring for damage and
replace it if necessary.
6. Install the oil strainer, spring, O-ring
5ML-F8199-E1ch6.pmd2004/10/04, 20:08 9

6-10
1
2
3
4
5
6
7
8
9
PERIODIC MAINTENANCE AND MINOR REPAIR
and engine oil drain bolts, and then
tighten the drain bolts to the speci-
fied torque.
Tightening torque:
Engine oil drain bolt A:
20 Nm (2.0 m  kgf, 14.5ft  lbf)
Engine oil drain bolt B:
20 Nm (2.0 m  kgf, 14.5 ft  lbf)
NOTE:
Make sure that the O-ring is properly
seated.7. Add the specified amount of the
recommended engine oil, and then
install and tighten the engine oil filler
cap.
Recommended engine oil:
See page 8-1.
Oil change quantity:
0.9 L (0.98 US qt) (0.83 Imp.qt)
ECA11670
cC8 88 8
8Do not use oils with a diesel
specification of “CD” or oils of a
higher quality than specified. Inaddition, do not use oils labeled
“ENERGY CONSERVING II” or
higher.
8 88 8
8Be sure no foreign material en-
ters the crankcase.
8. Start the engine, and then let it idle
for several minutes while checking
it for oil leakage. If oil is leaking,
immediately turn the engine off and
check for the cause.
9. Turn the engine off, and then check
the oil level and correct it if neces-
sary.
10. Reset the oil change indicator. (See
page 3-2 for reset procedures.)NOTE:
If the engine oil is changed before the
oil change indicator changes to red (i.e.
before the periodic oil change interval
has been reached), the indicator must
be reset after the oil change for the next
periodic oil change to be indicated at the
correct time.
EAU20060
Final transmission oilThe final transmission case must be
checked for oil leakage before each ride.
If any leakage is found, have a Yamaha
dealer check and repair the scooter. In
addition, the final transmission oil must
be changed as follows at the intervals
specified in the periodic maintenance
and lubrication chart.
1. Start the engine, warm it up by
riding the scooter for several min-
utes, and then stop the engine.
2. Place the scooter on the
centerstand.
3. Place an oil pan under the final
transmission case to collect the
used oil.
4. Remove the oil filler cap and drain
bolt to drain the oil from the final
transmission case.
5ML-F8199-E1ch6.pmd2004/10/04, 20:08 10

6-11
1
2
3
4
5
6
7
8
9
PERIODIC MAINTENANCE AND MINOR REPAIR
ZAUM00**
1
1. Final transmission oil filler cap5. Install the final transmission oil
drain bolt, and then tighten it to the
specified torque.ZAUM00**
1
1. Final transmission oil drain bolt
Tightening torque:
Final transmission oil drain bolt:
23 Nm (2.3 m  kgf, 16.6 ft  lbf)
6. Add the specified amount of the
recommended final transmission
oil, and then install and tighten the
oil filler cap.
Recommended final transmission
oil:
See page 8-1.
Oil quantity:
0.13 L (0.14 US qt) (0.1 Imp.qt)
EWA11310
w8 88 8
8Make sure that no foreign mate-
rial enters the final transmission
case.
8 88 8
8Make sure that no oil gets on the
tire or wheel.7. Check the final transmission case
for oil leakage. If oil is leaking,
check for the cause.
EAUT1341
Air filter and V-belt case air fil-
ter elementsThe air filter and V-belt case air filter el-
ements should be cleaned at the inter-
vals specified in the periodic mainte-
nance and lubrication chart. Clean both
filter elements more frequently if you are
riding in unusually wet or dusty areas.
Cleaning the air filter element
1. Place the scooter on the
centerstand.
2. Remove the air filter case cover by
removing the screws.ZAUM00**
2(×6)
1
1. Air filter case cover
2. Screw3. Pull the air filter element out, and
5ML-F8199-E1ch6.pmd2004/10/04, 20:08 11

6-13
1
2
3
4
5
6
7
8
9
PERIODIC MAINTENANCE AND MINOR REPAIR
ZAUM00**
1
1. V-belt case air filter element4. 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.
Recommended oil:
Engine oil
5. Insert the element into the air filter
case.
6. Install the filter element holder by
installing the screw.
EAU21300
Adjusting the carburetorThe carburetor is an important part of
the engine and requires very sophisti-
cated adjustment. Therefore, all carbu-
retor adjustments should be left to a
Yamaha dealer, who has the necessary
professional knowledge and experience. 7. Install the V-belt air filter case cover
by installing the screws.
5ML-F8199-E1ch6.pmd2004/10/04, 20:08 13

6-19
1
2
3
4
5
6
7
8
9
PERIODIC MAINTENANCE AND MINOR REPAIR
EAU22540
Rear brake shoes
1
2
ZAUM00591. Wear indicator
2. Wear limit lineThe rear brake is provided with a wear
indicator, which allows you to check the
brake shoe wear without having to dis-
assemble the brake. To check the brake
shoe wear, check the position of the
wear indicator while applying the brake.
If a brake shoe has worn to the point
that the wear indicator reaches the wear
limit line, have a Yamaha dealer replace
the brake shoes as a set. groove has almost disappeared, have a
Yamaha dealer replace the brake pads
as a set.
EAU32343
Checking the front brake fluid
levelZAUM00**
1
1. MInimum level markInsufficient brake fluid may allow air to
enter the brake system, possibly caus-
ing it to become ineffective.
Before riding, check that the brake fluid
is above the minimum level mark and
replenish if necessary. A low brake fluid
level may indicate worn brake pads and/
or brake system leakage. If the brake
fluid level is low, be sure to check the
brake pads for wear and the brake sys-
tem for leakage.
Observe these precautions:8When checking the fluid level, make
sure that the top of the master cyl-
inder is level by turning the handle-
bars.
8Use only the recommended quality
brake fluid, otherwise the rubber
seals may deteriorate, causing
leakage and poor braking perfor-
mance.
Recommended brake fluid:
DOT 4
8Refill with the same type of brake
fluid. Mixing fluids may result in a
harmful chemical reaction and lead
to poor braking performance.
8Be careful that water does not en-
ter the master cylinder when refill-
ing. Water will significantly lower the
boiling point of the fluid and may
result in vapor lock.
8Brake fluid may deteriorate painted
surfaces or plastic parts. Always
clean up spilled fluid immediately.
5ML-F8199-E1ch6.pmd2004/10/04, 20:08 19

6-20
1
2
3
4
5
6
7
8
9
PERIODIC MAINTENANCE AND MINOR REPAIR
EAU22720
Changing the brake fluidHave a Yamaha dealer change the brake
fluid at the intervals specified in the
NOTE after the periodic maintenance
and lubrication chart. In addition, have
the oil seals of the brake master cylin-
der and caliper as well as the brake hose
replaced at the intervals listed below or
whenever they are damaged or leaking.
8Oil seals: Replace every two years.
8Brake hose: Replace every four
years.
EAU23100
Checking and lubricating the
cablesThe operation of all control cables and
the condition of the cables should be
checked before each ride, and the
cables and cable ends should be lubri-
cated if necessary. If a cable is dam-
aged or does not move smoothly, have
a Yamaha dealer check or replace it.
Recommended lubricant:
Engine oil
EWA10720
wDamage to the outer sheath may in-
terfere with proper cable operation
and will cause the inner cable to rust.
Replace a damaged cable as soon as
possible to prevent unsafe condi-
tions.
8As the brake pads wear, it is nor-
mal for the brake fluid level to
gradually go down. However, if the
brake fluid level goes down sud-
denly, have a Yamaha dealer check
the cause.
5ML-F8199-E1ch6.pmd2004/10/04, 20:08 20

6-26
1
2
3
4
5
6
7
8
9
PERIODIC MAINTENANCE AND MINOR REPAIR
Specified fuses:
Main fuse:
30 A
Headlight fuse:
15 A
Signaling system fuse:
15 A
Ignition fuse:
7.5 A
Carburetor heater fuse:
7.5 A
ECA10640
cCDo not use a fuse of a higher amper-
age rating than recommended to
avoid causing extensive damage to
the electrical system and possibly a
fire.3. Turn the key to “ON” and turn on
the electrical circuit in question to
check if the device operates.
4. If the fuse immediately blows again,
have a Yamaha dealer check the
electrical system.
EAU23710
Replacing a headlight bulbThis model is equipped with quartz bulb
headlights. If a headlight bulb burns out,
replace it as follows.
1. Place the vehicle on the
centerstand.
2. Remove panel B. (See page 6-6.)
3. Disconnect the headlight coupler,
and then remove the bulb cover.ZAUM00**
1
1. Bulb cover4. Unhook the headlight bulb holder,
and then remove the defective bulb.
ZAUM00**
1
1. Headlight bulb holder
EWA10790
wHeadlight bulbs get very hot. There-
fore, keep flammable products away
from a lit headlight bulb, and do not
touch the bulb until it has cooled
down.5. Place a new headlight bulb into po-
sition, and then secure it with the
bulb holder.
ECA10660
cCDo not touch the glass part of the
headlight bulb to keep it free from oil,
otherwise the transparency of the
glass, the luminosity of the bulb, and
5ML-F8199-E1ch6.pmd2004/10/04, 20:08 26