2004 YAMAHA WHY 50 engine

SCOOTER CARE AND STORAGE
7 a. Remove the spark plug cap
and spark plug.
b. Pour a teaspoonful of engine
oil into the spark plug bore.
c. Install the spark plug cap onto
the spark plug, and then place
the spark plug on the cylinder
head so that the electrodes are
grounded. (This will limit
sparking during the next step.)
d. Turn the engine over several
times with the starter. (This will
coat the cylinder wall with oil.)
e. Remove the spark plug cap
from the spark plug, and then
install the spark plug and the
spark plug cap.
EWA00003
To prevent damage or injury from
sparking, make sure to ground the
spark plug electrodes while turning
the engine over.
5. Lubricate all control cables and
the pivoting points of all levers and
pedals as well as of the sidestand/
centerstand.
6. Check and, if necessary, correct
the tire air pressure, and then lift
the scooter so that both of its
wheels are off the ground.
Alternatively, turn the wheels a
little every month in order to
prevent the tires from becoming
degraded in one spot.
7. Cover the muffler outlet with a
plastic bag to prevent moisture
from entering it.
8. Remove the battery and fully
charge it. Store it in a cool, dry
place and charge it once a month.
Do not store the battery in an
excessively cold or warm place
(less than 0 °C or more than 30
°C). For more information on
storing the battery, see page 6-
18.
NOTE :
Make any necessary repairs before
storing the scooter.
7-4

SPECIFICATIONS
8
Model YH50
Dimensions:
Overall length 1.940 mm
Overall width 685 mm
Overall height 1.105 mm
Seat height 765 mm
Wheelbase 1.294 mm
Minimum ground clearance 125 mm
Minimum turning radius 1.800 mm
Weight:
Wet (with oil and a full fuel tank) 78 kg
Engine:
Engine type Air cooled, 2 strokes
Cylinder arrangement Single cylinder, horizontal
Displacement 49.2 cm3
Bore x stroke 40.0 x 39.2
Compression ratio 7.25:1
Starting system type Electric and kick starter
Lubrication system Separate lubrication
(Autolube)
Engine oil:
Type Yamalube 2
or 2 strokes engine oil
Classification Jaso FC ou ISO EG-C, EG-D
Capacity 1.3 LTransmission oil:
Type SAE 10W30 type SE
Capacity
Périodic oil change 0.11L
Total amount 0.13L
Air filter type:Wet type element
Fuel:
Recommended fuel Regular unleaded gasoline
(RON 91 mini)
Fuel tank capacity 7L
Carburetor:
Type / quantity PY-12
Manufacturer GURTNER
Spark plug:
Type / Manufacturer BR8HS / NGK
Spark plug gap 0.6—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 45/12 (3.750)
Transmission type V-belt automatic
Operation Centrifugal automatic type
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Specifications

CONSUMER INFORMATION
9
EAU01052*
YOU ARE HEREBY REMINDED THAT MODIFICATIONS TO THE ENGINE OR THE POWER OF THE SCOOTER ARE
FORBIDDEN BY LAW.
ANY CHANGES FOR THE PURPOSE OF RAISING THE TOP SPEED OF THE VEHICLE OR BOOSTING THE POWER
OF THE ENGINE WOULD LEAD TO THE SCOOTER BEING
CLASSED AS A SCOOTER.
THIS WOULD REQUIRE THE OWNER:
•TO OBTAIN A NEW TYPE APPROVAL
•TO OBTAIN A SCOOTER REGISTRATION LICENSE
•TO HOLD A DRIVING LICENSE
IN ADDITION, SUCH CHANGES WOULD LEAD TO THE INVALIDATION OF TIE INSURANCE COVER, SINCE
INSURANCE POLICIES EXPLICITLY FORBID TECHNICAL CHANGES WHICH HAVE THE PURPOSE OF BOOSTING
THE PERFORMANCE.
FOR THE REASONS SET OUT ABOVE, A BREACH OF THE PROHIBITION TO TAMPER WITH THE ENGINE IS
PUNISHED BY LAW BY APPROPRIATE FINES INCLUDING THE CONFISCATION OF THE VEHICLE.
FINES ARE ALSO INFLICTED, ACCORDING TO CIRCUMSTANCES, FOR DRIVING WITHOUT A HELMET AND A
LICENSE PLATE, AS WELL AS FOR TAX EVASION (OMITTING TO PAY OWNERSHIP TAX).
DRIVING WITHOUT A DRIVING LICENSE IS A CRIMINAL OFFENSE.
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