air filter YAMAHA AEROX50 2004 Owners Manual

2
DESCRIPTION
Left view
1. Rear brake lever (page 3-5, 6-13, 6-16)
2. Left handlebar switches (page 3-4)
3. Speedometer (page 3-3)
4. Main switch/steering lock (page 3-1, 3-9)
2-1
1
23
4
68
7
5
5. Final transmission oil filler cap (page 6-7)
6. Centerstand (page 6-16)
7. Kick starter (page 3-7)
8. Air filter (page 6-9)

EAU00462
PERIODIC MAINTENANCE AND MINOR REPAIR
Periodic maintenance and lubrication chart ............ 6-2
Removing and installing cowling and panel ............ 6-5
Cowling A ................................................................ 6-5
Panel A .................................................................... 6-5
Checking the spark plug ......................................... 6-6
Final transmission oil .............................................. 6-7
Coolant .................................................................... 6-8
Cleaning the air filter element ................................. 6-9
Adjusting the carburetor ........................................ 6-10
Adjusting the throttle cable free play ..................... 6-11
Tires ...................................................................... 6-11
Wheels .................................................................. 6-13
Adjusting the front and rear brake lever
free play ................................................................ 6-13
Checking the front and rear brake pads ................ 6-14
Checking the brake fluid level ............................... 6-14
6 Changing the brake fluid ....................................... 6-15
Adjusting the autolube pump ................................ 6-15
Checking and lubricating the cables ..................... 6-16
Lubricating the front and rear brakes levers .......... 6-16
Checking and lubricating the centerstand ............. 6-16
Checking the front fork .......................................... 6-17
Checking the steering ........................................... 6-17
Checking the wheel bearings ................................ 6-18
Battery ................................................................... 6-18
Replacing the fuse ................................................ 6-20
Replacing a headlight bulb .................................... 6-20
Replacing tail/brake light bulb ............................... 6-21
Replacing a turn signal light bulb .......................... 6-22
Troubleshooting ..................................................... 6-22
Troubleshooting chart ............................................ 6-23
Engine overheating ............................................... 6-24

PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU03453
Safety is an obligation of the owner.
Periodic inspection, adjustment and
lubrication will keep your vehicle in the
safest and most efficient condition pos-
sible. The most important points of
scooter inspection, adjustment, and
lubrication are explained on the
following pages.
EW000060
If you are not familiar with scooter
maintenance work, have a Yamaha
dealer do it for you.
EAU00466
EW000061
This scooter is designed for use on
paved roads only. If this scooter is
operated in abnormally dusty,
muddy or wet conditions, the air filter
element should be cleaned or
replaced more frequently, otherwise
rapid engine wear may result.
Consult a Yamaha dealer for proper
maintenance intervals.WARNING
WARNING
6-1

PERIODIC MAINTENANCE AND MINOR REPAIR
6
1 * Fuel line• Check fuel hoses and vacuum hose for cracks or damage.√√√√ √
2 Spark plug• Replace.√√√√ √
3 Air filter element• Clean.√√• Replace.√√
4 * Battery• Check electrolyte level and specific gravity.
√√√√ √
• Make sure that the breather hose is properly routed.
• Check operation, fluid level and vehicle for fluid leakage.
√√√√√ √
5 * Front brake(See NOTE on page 6-4.)
• Replace brake pads. Whenever worn to the limit
• Check operation, fluid level and vehicle for fluid leakage.
√√√√√ √
6 * Rear brake(See NOTE on page 6-4.)
• Replace brake pads. Whenever worn to the limit
7 * Brake hoses• Check for cracks or damage.√√√√ √• Replace. (See NOTE on page 6-4.) Every 4 years
8 * Wheels• Check runout and for damage.√√√√
EAU03686
Periodic maintenance and lubrication chart
NOTE :
•The annual checks must be performed every year, except if a kilometer-based maintenance is performed instead.
•From 30,000 km, repeat the maintenance intervals starting from 6,000 km.
•Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools, data and technical skills.
ODOMETER READING (x 1,000 km)
NO. ITEMCHECK OR MAINTENANCE JOB
1
ANNUAL
CHECK
6121824
6-2

PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU03541*
NOTE :
•The air filter needs more frequent service if you are riding in unusually wet or dusty areas.
•Hydraulic brake service
•Regularly check and, if necessary, correct the brake fluid level.
•Every two years change the brake fluid.
•Replace the brake hoses every four years and if cracked or damaged.
21 Moving parts and cables• Lubricate.√√√√ √
22 *Lights, signals• Check operation.
√√√√√ √
and switches• Adjust headlight beam.
ODOMETER READING (x 1,000 km)
NO. ITEMCHECK OR MAINTENANCE JOB
1
ANNUAL
CHECK
6121824
6-4

PERIODIC MAINTENANCE AND MINOR REPAIR
6
1
ZAUM0276
1. Air filter element
5. Install the cowling.
NOTE :
If the engine overheats, see page 6-24
for further instructions.
1
ZAUM0275
1. Screws
EAUM0071
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
frequently 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.
EW000075
Use only a dedicated parts cleaning
solvent. To avoid the risk of fire or
explosion, do not use gasoline or
solvents with a low flash point.
EC000089
To avoid damaging the foam material,
handle it gently and carefully, and do
not twist or wring it.
WARNING
CAUTION:
6-9

PERIODIC MAINTENANCE AND MINOR REPAIR
6
1
4 32
ZAUM0156
3. Apply oil of the recommended
type to the entire surface of the
element, and then squeeze the
excess oil out.
NOTE :
The air filter element should be wet but
not dripping.
Recommended oil:
Engine oil
4. Insert the element into the air filter
case.
CAUTION:EC000082
•Make sure that the air filter
element is properly seated in
the air filter case.
•The engine should never be
operated without the air filter
element installed, otherwise the
piston(s) and/or cylinder(s) may
become excessively worn.
5. Install the air filter case cover by
installing the screws.
6-10
EAU00631
Adjusting the carburetor
The carburetor is an important part of
the engine and requires very
sophisticated adjustment. Therefore, all
carburetor adjustments should be left
to a Yamaha dealer, who has the
necessary professional knowledge and
experience.

SPECIFICATIONS
8
Specifications
Model YQ50
Dimensions:
Overall length 1.743 mm
Overall width 690 mm
Overall height 1.170 mm
Seat height 828 mm
Wheelbase 1.256 mm
Minimum ground clearance 185 mm
Minimum turning radius 1.800 mm
Basic weight:97 kg
(with oil and full fuel tank)
Engine:
Engine type Liquid cooled, 2 stroke
Cylinder arrangement Single cylinder, horizontal
Displacement 49.2 cc
Bore x stroke 40.0 x 39.2
Compression ratio 7.44:1
Starting system Electric and kick starter
Lubrication systemSeparate lubrication (Autolube)
Engine oil:
Type Yamalube 2
or 2 stroke engine oil
Recommended engine oil Jaso FC
classification or ISO EG-C, EG-D
Capacity 1.3 LFinal transmission oil:
Type SAE 10W30 type SE
Quantity 0.13L
Cooling system capacity:1.2L
(total amount)
Air filter type:Wet type element
Fuel:
Recommended fuel Regular unleaded gasoline
(RON 91 mini)
Fuel tank capacity 7L
Carburetor:
Manufacturer DELL'ORTO
Model/quantity PHBN 12HS x1
Spark plug:
Manufacturer/Model NGK / BR8HS
Spark plug gap 0.5—0.7 mm
Clutch type:Dry, centrifugal automatic
Transmission:
Primary reduction system Helical gear
Primary reduction ratio 52/13 (4.000)
Secondary reduction system Spur gear
Secondary reduction ratio 43/14 (3.071)
Transmission type V-belt automatic
Operation Centrifugal automatic type
8-1