SAFETY INFORMATION.....................1-1
DESCRIPTION.....................................2-1
Left view ...........................................2-1
Right view .........................................2-2
Controls and instruments .................2-3
INSTRUMENT AND CONTROL
FUNCTIONS........................................3-1
Main switch/steering lock .................3-1
Indicator lights ..................................3-1
Speedometer unit .............................3-2
Fuel gauge ........................................3-3
Clock .................................................3-3
Handlebar switches ..........................3-3
Front brake lever...............................3-4
Rear brake lever................................3-4
Fuel and 2-stroke engine oil tank
caps ...............................................3-4
Fuel ...................................................3-5
2-stroke engine oil ............................3-5
Kickstarter.........................................3-6
Seat...................................................3-6
Storage compartment.......................3-6
PRE-OPERATION CHECKS...............4-1
Pre-operation check list....................4-2
OPERATION AND IMPORTANT RIDING
POINTS................................................5-1
Starting a cold engine ......................5-1Starting off ........................................5-1
Acceleration and deceleration ..........5-2
Braking..............................................5-2
Engine break-in.................................5-2
Parking ..............................................5-2
PERIODIC MAINTENANCE AND
MINOR REPAIR...................................6-1
Periodic maintenance and
lubrication chart ............................6-2
Checking the spark plug ..................6-5
Final transmission oil ........................6-6
Coolant (only for liquid-cooled
models) ..........................................6-6
Cleaning the air filter element ...........6-8
Adjusting the carburetor ...................6-9
Adjusting the throttle cable free
play ................................................6-9
Tires ..................................................6-9
Adjusting the brake lever free
play ..............................................6-11
Adjusting the rear brake lever free
play ..............................................6-11
Checking the front brake pads
and rear brake shoes ..................6-12
Checking the front brake fluid
level .............................................6-13
Changing the brake fluid ................6-13
Checking and lubricating the
cables ..........................................6-13Checking and lubricating the
throttle grip and cable .................6-14
Adjusting the Autolube pump .........6-14
Lubricating the front and rear
brake levers .................................6-14
Checking and lubricating the
centerstand .................................6-14
Checking the front fork ...................6-15
Checking the steering.....................6-15
Checking the wheel bearings .........6-15
Replacing the headlight bulb or a
front turn signal light bulb ...........6-16
Replacing a turn signal light bulb
or the tail/brake light bulb ...........6-16
Replacing the license plate light
bulb .............................................6-17
Battery ............................................6-17
Replacing the fuse ..........................6-18
Troubleshooting ..............................6-19
Troubleshooting chart .....................6-20
SCOOTER CARE AND STORAGE.....7-1
Care ..................................................7-1
Storage .............................................7-3
SPECIFICATIONS...............................8-1
CONSUMER INFORMATION.............9-1
Identification numbers ......................9-1
TABLE OF CONTENTS
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EAU10410
Left view
DESCRIPTION
2-1
2
1. Headlight (page 6-16)
2. Front blinker (page 6-16)
3. Seat (page 3-6)
4. Handle 5. Left rear blinker (page 6-16)
6. kickstarter (page 3-6)
7. Air filter (page 6-8)
8. Center stand (page 6-14)
1
2
3
4
5
6
87
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EAU17710
Periodic maintenance and lubrication chart
NOTE:
The annual checks must be performed every year, except if a kilometer-based maintenance is performed
instead.
From 30000 km, repeat the maintenance intervals starting from 6000 km.
Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools, data and
technical skills.
PERIODIC MAINTENANCE AND MINOR REPAIR
6-2
6
ODOMETER READING (x 1000 Km) ANNUAL
NOITEM CHEK OR MAINTENANCE JOB 1 6 12 18 24CHECK
1*Fuel line• Check fuel and vacuum hoses for cracks or damage.√√√√ √
• Check condition.
2
Spark plug• Clean and regap.√√
• Replace.√√
3Air filter element• Clean.√√• Replace.√√
4*Front brake• Check operation, fluid level and vehicle for fluid leakage.√√ √ √√ √• Replace brake pads. Whenever worn to the limit
5*Rear brake• Check operation and adjust brake lever free play.√√ √ √√ √• Replace brake shoes. Whenever worn to the limit
6*Brake hose• Check for cracks or damage.√√√√ √• Replace. Every 4 years
7*Wheels• Check runout and for damage.√√√√
• Check tread depth and for damage.
8*Tires• Replace if necessary.
√√√√ √
• Check air pressure.
• Correct if necessary.
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EAU18660
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 replace the internal components of the brake master cylinder and caliper, and change the bra-
ke fluid.
• Replace the brake hoses every four years and if cracked or damaged.
PERIODIC MAINTENANCE AND MINOR REPAIR
6-4
6
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EAUS1090
Cleaning the air filter
element
The air filter element should be clea-
ned at the intervals specified in the
periodic maintenance and lubrication
chart. Clean the air filter element more
frequently if you are riding in unu-
sually wet or dusty areas.
1. Lid from the air filter box
2. Screw
3. Screw
1. Remove the screw clamp and the
screws that fasten the air filter
case to the crankcase.
1. Lid from the air filter box
2. Screws (x 3)
2. Remove the air filter case cover
by removing the screws.
3. Pull the air filter element out.
4. Clean the air filter element with
solvent, and then squeeze the
remaining solvent out.
1. The air filter
EWA10430
s s
WARNING
Use only a dedicated parts clea-
ning solvent. To avoid the risk of
fire or explosion, do not use gasoli-
ne or solvents with a low flash
point.
ECA10510
CAUTION
To avoid damaging the foam mate-
rial, handle it gently and carefully,
and do not twist or wring it.
5. Apply oil of the recommended
type to the entire surface of the
sponge material, and then sque-
eze the excess oil out.
NOTE:
The air filter element should be wet
but not dripping.
6. Insert the element into the air fil-
ter case.
Recommended oil:
Engine oil
6
PERIODIC MAINTENANCE AND MINOR REPAIR
6-8
12
3
1 2
1
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ECA10480
CAUTION
Make sure that the air filter ele-
ment 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.
7. Install the air filter case cover by
installing the screws.
8. Install the screw clamp and the
screws that fasten the air filter
case to the crankcase.
EAU21300
Adjusting the carburetor
The carburetor is an important part of
the engine and requires very sophisti-
cated adjustment. Therefore, all car-
buretor adjustments should be left to
a Yamaha dealer, who has the neces-
sary professional knowledge and
experience.
EAU21370
Adjusting the throttle cable
free play
The throttle cable free play should
measure 2 ~ 5 mm (0,8 ~ 0,20 in) at
the throttle grip. Periodically check
the throttle cable free play and, if
necessary, adjust it as follows.
NOTE:
The engine idling speed must be
correctly adjusted before checking
and adjusting the throttle cable free
play.
1. Locknut
2. Adjuster
3. Free play
1. Loosen the locknut.
2. To increase the throttle cable free
play, turn the adjusting nut in
direction (a). To decrease the
throttle cable free play, turn the
adjusting nut in direction (b).
3. Tighten the locknut.
EAU33600
Tires
To maximize the performance, durabi-
lity, and safe operation of your vehi-
cle, note the following points regar-
ding the specified tires.
Tire air pressure
The tire air pressure should be chec-
ked and, if necessary, adjusted befo-
re each ride.
6
PERIODIC MAINTENANCE AND MINOR REPAIR
6-9
21 b
a3
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DimensionsOverall length
1740 mm
Overall width
675 mm
Overall height
1065 mm
Seat height
770 mm
Wheelbase
1210 mm
Ground clearance
132 mm
WeightWith oil and fuel
CS50 80.5 kg
CS50Z 83.7 kg
EngineEngine type
CS50 Air cooled 2-stroke
CS50Z Liquid cooled 2-stroke
Cylinder arrangement
Forward-inclined single cylinder
Displacement
49.2 cm3
Bore x stroke
40.0 x 39.2 mm
Compression ratio
CS50 10.20 :1
CS50Z 11.40 :1
Starting system
Electric starter and kickstarter
Lubrication system
Separate lubrication (Yamaha autolube)Type
YAMALUBE 2-cycle oil or 2-stroke engine
oil
Engine oil quantityQuantity
1.4 L
Transmission oilType
YAMALUBE 4 (10W30) or SAE10W30
type SE motor oil
Oil change quantity
0.10 L
Air filter element
Wet element
Fuel
Recommended fuel
Regular unleaded gasoline
Fuel tank capacity
5.5 L
CarburetorManufacturer
CS50 DELLORTO GURTNER
CS50Z DELLORTO
Type x quantity
CS50 PHVA 12 ZS/1 PY 12/1
CS50Z PHVA 12 ZS/1
Spark plug(s)Manufacturer/model
NGK/BR8HS
Spark plug gap
0.6-0.7 mm
Clutch type
Dry, centrifugal automatic
TransmissionPrimary reduction system
Helical gear
Primary reduction ratio
52/13 (4.000)
Secondary reduction system
Spur gear
Secondary reduction ratio
CS50 42/13 (3.230)
CS50Z 43 x 13 (3.310)
Transmission type
Single speed automatic
Operation
Centrifugal automatic type
ChassisCaster angle
25.00 degree
Trail
80.0 mm
Front tireSize
110/70-12 47L
Rear tireSize
120/70-12 51L 130/70-12 56L
Maximum load
CS50 161 kg
CS50Z 158 kg
Tire air pressure (measured on cold
tires)
Front
175 kPa
Rear
200 kPa
8
SPECIFICATIONS
8-1
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22-stroke engine oil .....................................3-5
AAcceleration and deceleration ...................5-2
Adjusting the Autolube pump ..................6-14
Adjusting the brake lever free play ..........6-11
Adjusting the carburetor ............................6-9
Adjusting the rear brake lever free play ...6-11
Adjusting the throttle cable free play .........6-9
BBattery......................................................6-17
Braking .......................................................5-2
CCare............................................................7-1
Changing the brake fluid..........................6-13
Checking and lubricating the cables .......6-13
Checking and lubricating the
centerstand ............................................6-14
Checking and lubricating the throttle
grip and cable ........................................6-14
Checking the front brake fluid level .........6-13
Checking the front brake pads and rear
brake shoes ...........................................6-12
Checking the front fork ............................6-15
Checking the spark plug ............................6-5
Checking the steering ..............................6-15
Checking the wheel bearings ..................6-15
Cleaning the air filter element ....................6-8
Clock ..........................................................3-3
Controls and instruments ..........................2-3
Coolant (only for liquid-cooled models).....6-6
EEngine break-in ..........................................5-2
FFinal transmission oil .................................6-6
Front brake lever ........................................3-4
Fuel ............................................................3-5
Fuel and 2-stroke engine oil tank caps .....3-4
Fuel gauge .................................................3-3
HHandlebar switches ...................................3-3
IIdentification numbers ...............................9-1
Indicator lights ...........................................3-1
KKickstarter ..................................................3-6
LLeft view .....................................................2-1
Lubricating the front and rear brake
levers .....................................................6-14
MMain switch/steering lock ..........................3-1
PParking .......................................................5-2
Periodic maintenance and lubrication
chart .........................................................6-2
Pre-operation check list .............................4-2
RRear brake lever .........................................3-4
Replacing a turn signal light bulb or the
tail/brake light bulb ................................6-16
Replacing the fuse ...................................6-18
Replacing the headlight bulb or a front
turn signal light bulb ..............................6-16
Replacing the license plate light bulb......6-17
Right view ..................................................2-2
SSeat ............................................................3-6
Speedometer unit ......................................3-2
Starting a cold engine ................................5-1
Starting off .................................................5-1
Storage.......................................................7-3
Storage compartment ................................3-6
TTires ...........................................................6-9
Troubleshooting .......................................6-19
Troubleshooting chart ..............................6-20
INDEX
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