
3. Fill up the fuel tank and add fuel
stabilizer (if available) to prevent
the fuel tank from rusting and the
fuel from deteriorating.
4. Perform the following steps to
protect the cylinder, piston rings,
etc. from corrosion.
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.) WARNING! To prevent
damage or injury from spar-
king, make sure to ground
the spark plug electrodes
while turning the engine
over. e. Remove the spark plug cap
from the spark plug, and then
install the spark plug and the
spark plug cap.
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. Alter-
natively, turn the wheels a little
every month in order to prevent
the tires from becoming degra-
ded 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 pla-
ce [less than 0 °C (30 °F) or more
than 30 °C (90 °F)]. For more
information on storing the bat-
tery, see page 6-19.TIP
Make any necessary repairs before
storing the scooter.
SCOOTER CARE AND STORAGE
7-4
7

Dimensions:Overall length:
1740 mm (68.5 in)
Overall width:
675 mm (26.6 in)
Overall height:
1065 mm (41.9 in)
Seat height:
770 mm (30.3 in)
Wheelbase:
1210 mm (47.6 in)
Ground clearance:
132 mm (5.20 in)
Weight:With oil and fuel:
CS50/CS50M: 81.0 kg (178.6 lb)
CS50Z: 84.0 kg (185.2 lb)
Engine:CS50/CS50M: Air cooled 2-stroke
CS50Z: Liquid cooled 2-stroke
Cylinder arrangement:
Forward-inclined single cylinder
Displacement:
49.2 cm
3
Bore x stroke:
40.0 x 39.2 mm (1.57 x 1.54 in)
Compression ratio:
CS50: 11.60:1
CS50M: 10.10 :1
CS50Z: 11.40 :1
Starting system:
Electric starter and kickstarter
Lubrication system:
Separate lubrication (Yamaha autolube)Type:
YAMALUBE 2 or 2-stroke engine oil
Engine oil quantity:Quantity:
1.40 L (1.48 US qt, 1.23 Imp.qt)
Final transmission oil:Type:
SAE10W30 type SE motor oil
Quantity:
0.11 L (0.12 US qt) (0.10 Imp.qt)
Cooling system (CS50Z):Coolant reservoir capacity (up to the maxi-
mumlevel mark):
0.25 L (0.26 US qt) (0.22 Imp.qt)
Radiator capacity (including all routes):
0.91 L (0.96 US qt) (0.80 Imp.qt)
Air filter:Air filter element:
Wet element
Fuel:Recommended fuel:
Regular unleaded gasoline
Fuel tank capacity:
5.5 L (1.45 US gal, 1.21 Imp.gal)
Fuel reserve amount:
1.9 L (0.50 US gal, 0.42 Imp.gal)
Carburetor:Manufacturer:
GURTNER
Type x quantity:
PY12
Spark plug(s):Manufacturer/model:
CS50-CS50Z: NGK/BR8HS
CS50M: NGK/BPR4HS
Spark plug gap:
0.6-0.7 mm (0.024-0.028 in)
Clutch: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:
CS50: 42 x 13 (3.230)
CS50M: 45 x 12(3.750)
CS50Z: 43 x 13 (3.308)
Transmission type:
V-belt automatic
Operation:
Centrifugal automatic type
Chassis:Frame type:
Steel tube underbone
Caster angle:
25.00 º
Trail:
80.0 mm (3.15 in)
Front tire:Type:
Tubeless
SPECIFICATIONS
8-1
8

2-stroke engine oil ...................................3-10
AAcceleration and deceleration ...................5-2
Air filter element .........................................6-9
Auxiliary light bulb, replacing ...................6-24
BBattery......................................................6-19
Brake fluid level, checking .......................6-15
Brake fluid, changing ...............................6-16
Brake lever, front ........................................3-6
Brake lever, rear .........................................3-7
Brake levers, lubricating ..........................6-16
Brake pads and shoes, checking ............6-14
Braking .......................................................5-3
CCarburetor,adjusting.................................6-10
Care............................................................7-1
Catalytic converter .....................................3-9
Centerstand, checking and lubricating ....6-17
Coolant.......................................................6-8
Cowling and panel, removing
and installing............................................6-5
DDimmer switch ...........................................3-6
EEngine break-in ..........................................5-4
FFinal transmission oil .................................6-7
Front brake lever free play, checking.......6-13
Front fork, checking .................................6-18
Fuel ............................................................3-8
Fuel and 2-stroke engine oil tank caps .....3-7
Fuel consumption, tips for reducing ..........5-3
Fuse, replacing.........................................6-20
HHandlebar switches ...................................3-6
Headlight and front turn signal light
bulb, replacing .......................................6-21
High beam indicator light...........................3-2
Horn switch ................................................3-6
IIdentification numbers ...............................9-1
Indicator and warning lights ......................3-2
KKey identification number ..........................9-1
Kickstarter ................................................3-10
LLicense plate light bulb, replacing ...........6-24
Luggage hook ..........................................3-13
M
Main switch/steering lock ..........................3-1
Matte color, caution ...................................7-1
Model label ................................................9-2
Multi-function display ................................3-4
OOil level warning light .................................3-3
PParking .......................................................5-4
Part locations .............................................1-5
Periodic maintenance and lubrication
chart .........................................................6-2
Pre-operation check list .............................4-2
RRear brake lever free play, adjusting .......6-13
Rider seat .................................................3-11
SSafe-riding points.......................................1-5
Safety information ......................................1-1Shock absorber assembly, adjusting.......3-12
Spark plug, checking .................................6-6
Specifications.............................................7-3
Speedometer .............................................3-3
Start switch ................................................3-6
Starting a cold engine ................................5-1
Starting off .................................................5-2
Steering, checking ...................................6-18
Storage.......................................................7-3
Storage compartment ..............................3-11
TTail/brake light bulb or rear turn signal
light bulb, replacing ...............................6-23
Throttle cable free play, adjusting ............6-10
Throttle grip and cable, checking and
lubricating ..............................................6-16
Tires .........................................................6-11
Troubleshooting .......................................6-25
Troubleshooting charts ............................6-26
Turn signal indicator lights .........................3-2
Turn signal switch ......................................3-6
VVehicle identification number .....................9-1
WWheel bearings, checking........................6-19
Wheels .....................................................6-12
INDEX