2009 YAMAHA AEROX50 maintenance

PERIODIC MAINTENANCE AND ADJUSTMENT
6-6
6
EAU18740
Removing and installing the
cowling and panel The cowling and panel shown above
need to be removed to perform some of
the maintenance jobs described in this
chapter. Refer to this section each time
a cowling or panel needs to be re-
moved and installed.
EAU18790
Cowling A
To remove the cowlingRemove the screws, and then take the
cowling off.To install the cowling
Place the cowling in the original posi-
tion, and then install the screws.
EAUM1250
Panel A
To remove the panel1. Open the storage compartment.
(See page 3-10.)
2. Remove the screw, and then take
the panel off.To install the panel
1. Place the panel in the original posi-
tion, and then install the screw.
2. Close the storage compartment.
1. Cowling A
2. Panel A1
2ZAUM0270
1. Screw
1ZAUM0271
1. Panel A
2. Screw
2
1
ZAUM0272
U3C6E1E0.book Page 6 Friday, August 8, 2008 10:09 AM

PERIODIC MAINTENANCE AND ADJUSTMENT
6-7
6
EAU19622
Checking the spark plug The spark plug is an important engine
component, which should be checked
periodically, preferably by a Yamaha
dealer. Since heat and deposits will
cause any spark plug to slowly erode, it
should be removed and checked in ac-
cordance with the periodic mainte-
nance and lubrication chart. In addition,
the condition of the spark plug can re-
veal the condition of the engine.
The porcelain insulator around the cen-
ter electrode of the spark plug should
be a medium-to-light tan (the ideal color
when the vehicle is ridden normally). If
the spark plug shows a distinctly differ-
ent color, the engine could be operating
improperly. Do not attempt to diagnose
such problems yourself. Instead, have
a Yamaha dealer check the vehicle.
If the spark plug shows signs of elec-
trode erosion and excessive carbon or
other deposits, it should be replaced.Before installing a spark plug, the spark
plug gap should be measured with a
wire thickness gauge and, if necessary,
adjusted to specification.
Clean the surface of the spark plug
gasket and its mating surface, and then
wipe off any grime from the spark plug
threads.
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 finger tight. However, the spark
plug should be tightened to the speci-fied torque as soon as possible.
Specified spark plug:
NGK/BR8HS
1. Spark plug gapSpark plug gap:
0.6–0.7 mm (0.024–0.028 in)
Tightening torque:
Spark plug:
20 Nm (2.0 m·kgf, 14 ft·lbf)
1
ZAUM0037
U3C6E1E0.book Page 7 Friday, August 8, 2008 10:09 AM

PERIODIC MAINTENANCE AND ADJUSTMENT
6-8
6
EAU20064
Final transmission oil The 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 transmis-
sion oil must be changed as follows at
the intervals specified in the periodic
maintenance and lubrication chart.
1. Start the engine, warm up the final
transmission oil by riding the
scooter for several minutes, and
then stop the engine.
2. Place the scooter on the center-
stand.
3. Place an oil pan under the final
transmission case to collect the
used oil.
4. Remove the final transmission oil
filler cap and final transmission
drain bolt to drain the oil from the fi-
nal transmission case.5. Install the final transmission oil
drain bolt, and then tighten it to the
specified torque.
6. Refill with the specified amount of
the recommended final transmis-
sion oil, and then install and tighten
the oil filler cap. WARNING! Make
sure that no foreign material en-
ters the final transmission case.
Make sure that no oil gets on the
tire or wheel.
[EWA11311]
7. Check the final transmission case
for oil leakage. If oil is leaking,
check for the cause.
1. Final transmission oil drain bolt
2. Final transmission oil filler cap
Tightening torque:
Final transmission oil drain bolt:
18 Nm (1.8 m·kgf, 13 ft·lbf)
12
ZAUM0273
Recommended final transmission
oil:
See page 8-1.
Oil quantity:
0.11 L (0.12 US qt, 0.10 Imp.qt)
U3C6E1E0.book Page 8 Friday, August 8, 2008 10:09 AM

PERIODIC MAINTENANCE AND ADJUSTMENT
6-9
6
EAU20070
Coolant The coolant level should be checked
before each ride. In addition, the cool-
ant must be changed at the intervals
specified in the periodic maintenance
and lubrication chart.
EAUM2102
To check the coolant level
1. Place the vehicle on a level sur-
face and hold it in an upright posi-
tion.TIP

The coolant level must be checked
on a cold engine since the level
varies with engine temperature.


Make sure that the vehicle is posi-
tioned straight up when checking
the coolant level. A slight tilt to theside can result in a false reading.
2. Check the coolant level through
the check window.
TIPThe coolant should be between theminimum and maximum level marks.3. If the coolant is at or below the
minimum level mark, remove the
cowling A. (See page 6-6.)
4. Open the reservoir cap, and then
add coolant to the maximum level
mark. WARNING! Remove only
the coolant reservoir cap. Never
attempt to remove the radiator
cap when the engine is hot.
[EWA15161]
NOTICE: If coolant is not
available, use distilled water or
soft tap water instead. Do not
use hard water or salt water
since it is harmful to the engine.
If water has been used instead
of coolant, replace it with cool-
ant as soon as possible, other-wise the cooling system will not
be protected against frost and
corrosion. If water has been
added to the coolant, have a
Yamaha dealer check the anti-
freeze content of the coolant as
soon as possible, otherwise the
effectiveness of the coolant will
be reduced.
[ECA10472]
5. Close the reservoir cap, and then
install the cowling.
1. Maximum level mark
2. Minimum level mark
1
2
ZAUM0591
1. Coolant reservoir capCoolant reservoir capacity:
0.25 L (0.26 US qt, 0.22 Imp.qt)1ZAUM0274
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-10
6
EAU33031
Changing the coolant
The coolant must be changed at the in-
tervals specified in the periodic mainte-
nance and lubrication chart. Have a
Yamaha dealer change the coolant.
WARNING! Never attempt to remove
the radiator cap when the engine is
hot.
[EWA10381]EAUM1642
Cleaning the air filter element The air filter element should be cleaned
at the intervals specified in the periodic
maintenance and lubrication chart.
Clean the air filter element more fre-
quently if you are riding in unusually
wet or dusty areas.
1. Remove the air filter case cover by
removing the screws.
2. Pull the air filter element out, clean
it with solvent, and then squeeze
the remaining solvent out.
WARNING! Use only a dedicat-
ed parts cleaning solvent. To
avoid the risk of fire or explo-
sion, do not use gasoline or sol-
vents with a low flash point.
[EWA10431]
NOTICE: To avoid dam-
aging the foam material, handle
it gently and carefully, and do
not twist or wring it.
[ECA10511]
3. Apply oil of the recommended type
to the entire surface of the ele-
ment, and then squeeze the ex-
cess oil out.
1. Screw
1
ZAUM0275
1. Air filter element
1ZAUM02761
4 32ZAUM0156
U3C6E1E0.book Page 10 Friday, August 8, 2008 10:09 AM

PERIODIC MAINTENANCE AND ADJUSTMENT
6-11
6
TIPThe air filter element should be wet butnot dripping.
4. Insert the element into the air filter
case. NOTICE: Make sure that
the air filter element is properly
seated in the air filter case. The
engine should never be operat-
ed without the air filter element
installed, otherwise the pis-
ton(s) and/or cylinder(s) may
become excessively worn.
[ECA10481]
5. Install the air filter case cover by in-
stalling the screws.
EAU21300
Adjusting the carburetor The 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 neces-
sary professional knowledge and expe-
rience.
EAU21382
Checking the throttle cable
free play The throttle cable free play should mea-
sure 1.5–3.0 mm (0.06–0.12 in) at the
throttle grip. Periodically check the
throttle cable free play and, if neces-
sary, have a Yamaha dealer adjust it.
Recommended oil:
Foam air filter oil
1. Throttle cable free play1ZAUM0051
U3C6E1E0.book Page 11 Friday, August 8, 2008 10:09 AM

PERIODIC MAINTENANCE AND ADJUSTMENT
6-12
6
EAU21872
Tires To maximize the performance, durabil-
ity, and safe operation of your vehicle,
note the following points regarding the
specified tires.
Tire air pressure
The tire air pressure should be checked
and, if necessary, adjusted before each
ride.
WARNING
EWA10501
Operation of this vehicle with im-
proper tire pressure may cause se-
vere injury or death from loss of
control.


The tire air pressure must be
checked and adjusted on cold
tires (i.e., when the temperature
of the tires equals the ambient
temperature).


The tire air pressure must be ad-
justed in accordance with the
riding speed and with the total
weight of rider, passenger, car-
go, and accessories approvedfor this model.
WARNING
EWA10511
Never overload your vehicle. Opera-
tion of an overloaded vehicle couldcause an accident.
Tire inspection
The tires must be checked before each
ride. If the center tread depth reaches
the specified limit, if the tire has a nail or
glass fragments in it, or if the sidewall is
cracked, have a Yamaha dealer re-
place the tire immediately.
ZAUM0053
Tire air pressure (measured on cold
tires):
0–90 kg (0–198 lb):
Fr o nt :
150 kPa (1.50 kgf/cm², 22 psi)
Rear:
150 kPa (1.50 kgf/cm², 22 psi)
90–180 kg (198–397 lb):
Fr o nt :
160 kPa (1.60 kgf/cm², 23 psi)
Rear:
170 kPa (1.70 kgf/cm², 25 psi)
Maximum load*:
180 kg (397 lb)
* Total weight of rider, passenger, car-
go and accessories
1. Tire tread depth
2. Tire sidewall
Minimum tire tread depth (front and
rear):
1.6 mm (0.06 in)
1
2
ZAUM0054
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-13
6
TIPThe tire tread depth limits may differ
from country to country. Always complywith the local regulations.
Tire information
This model is equipped with tubeless
tires.
After extensive tests, only the tires list-
ed below have been approved for this
model by Yamaha Motor Co., Ltd.
WARNING
EWA10470


Have a Yamaha dealer replace
excessively worn tires. Besides
being illegal, operating the vehi-
cle with excessively worn tires
decreases riding stability and
can lead to loss of control.


The replacement of all wheel
and brake related parts, includ-
ing the tires, should be left to a
Yamaha dealer, who has the
necessary professional knowl-edge and experience.
EAU21960
Cast wheels To maximize the performance, durabil-
ity, and safe operation of your vehicle,
note the following points regarding the
specified wheels.

The wheel rims should be checked
for cracks, bends or warpage be-
fore each ride. If any damage is
found, have a Yamaha dealer re-
place the wheel. Do not attempt
even the smallest repair to the
wheel. A deformed or cracked
wheel must be replaced.


The wheel should be balanced
whenever either the tire or wheel
has been changed or replaced. An
unbalanced wheel can result in
poor performance, adverse han-
dling characteristics, and a short-
ened tire life.


Ride at moderate speeds after
changing a tire since the tire sur-
face must first be “broken in” for it
to develop its optimal characteris-
tics.
Front tire:
Size:
130/60-13 53L (MICHELIN), 53P
(PIRELLI)
Manufacturer/model:
MICHELIN / PILOT SPORT
PIRELLI / EVO21
Rear tire:
Size:
140/60-13 57L (MICHELIN), 53P
(PIRELLI)
Manufacturer/model:
MICHELIN / PILOT SPORT
PIRELLI / EVO22
U3C6E1E0.book Page 13 Friday, August 8, 2008 10:09 AM