Page 25 of 76

To install the 2-stroke engine oil tank
cap, push it into the oil tank opening.
EWA10141
sWARNING
Make sure that the fuel and 2-stro-
ke engine oil tank caps are properly
installed before riding the scooter.
Leaking fuel is a fire hazard.
EAU13212
Fuel
Make sure there is sufficient gasoline
in the tank.
EWA10881
sWARNING
Gasoline and gasoline vapors are
extremely flammable. To avoid fires
and explosions and to reduce the
risk of injury when refueling, follow
these instructions.
1. Before refueling, turn off the engi-
ne and be sure that no one is sit-
ting on the vehicle. Never refuel
while smoking, or while in the
vicinity of sparks, open flames, or
other sources of ignition such as
the pilot lights of water heaters
and clothes dryers.
2. Do not overfill the fuel tank. Stop
filling when the fuel reaches the
bottom of the filler tube. Because
fuel expands when it heats up,
heat from the engine or the sun
can cause fuel to spill out of the
fuel tank.
1. Fuel tank filler tube
2. Fuel level
3. Wipe up any spilled fuel imme-
diately. NOTICE: Immediately
wipe off spilled fuel with a cle-
an, dry, soft cloth, since fuel
may deteriorate painted surfa-
ces or plastic parts.
[ECA10071]
4. Be sure to securely close the fuel
tank cap.
EWA15151
sWARNING
Gasoline is poisonous and can cau-
se injury or death. Handle gasoline
with care. Never siphon gasoline by
mouth. If you should swallow some
gasoline or inhale a lot of gasoline
vapor, or get some gasoline in your
1
2
ZAUM0020
INSTRUMENT AND CONTROL FUNCTIONS
3-8
3
Page 26 of 76

eyes, see your doctor immediately.
If gasoline spills on your skin, wash
with soap and water. If gasoline
spills on your clothing, change your
clothes.
EAU13270
Your Yamaha engine has been desig-
ned to use regular unleaded gasoline
with a research octane number of 91
or higher. If knocking (or pinging)
occurs, use a gasoline of a different
brand or premium unleaded fuel. Use
of unleaded fuel will extend spark
plug life and reduce maintenance
costs.
EAU13432
Catalytic converter
This model is equipped with a cataly-
tic converter in the exhaust system.
EWA10861
sWARNING
The exhaust system is hot after
operation. To prevent a fire hazard
or burns:
●Do not park the vehicle near
possible fire hazards such as
grass or other materials that
easily burn.
●Park the motorcycle in a place
where pedestrians or children
are not likely to touch the hot
exhaust system.
●Make sure that the exhaust
system has cooled down befo-
re doing any maintenance
work.
●Do not allow the engine to idle
more than a few minutes. Long
idling can cause a build-up of
heat.
ECA10701
NOTICE
Use only unleaded gasoline. The
use of leaded gasoline will cause
unrepairable damage to the cataly-
tic converter.
Recommended fuel:
REGULAR UNLEADED
GASOLINE ONLY
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)
INSTRUMENT AND CONTROL FUNCTIONS
3-9
3
Page 27 of 76
EAUS1500
2-stroke engine oil
Make sure that there is sufficient 2-
stroke engine oil in the oil tank. Add
the recommended 2-stroke engine oil
as necessary.
To access the 2-stroke engine oil
tank, open the storage compartment.
See page 3-11).
1. Remove the 2-stroke engine oil
tank cap by pulling it off.
2 Install the 2-stroke engine oil tank
cap by pushing it into the oil tank
opening.
TIP
Make sure that the 2-stroke engine oil
tank cap is properly installed before
riding the vehicle.
EAUS1050
Kickstarter
1. Kickstarter lever
To start the engine, push the kickstar-
ter down lightly with your foot until the
gears engage, and then push it down
smoothly but forcefully.
1
Recommended oil:
See page 8-1
Oil quantity:
1.4 L (1.48 US qt) (1.23 Imp.qt)
INSTRUMENT AND CONTROL FUNCTIONS
3-10
3
Page 28 of 76
EAU14160
Rider seat
To open the rider seat
1. Place the scooter on the centers-
tand.
2. Insert the key into the main
switch, and then turn it counter-
clockwise.
1. Open.
TIP
Do not push inward when turning the
key.
3. Fold the rider seat up.
1. Seat
To close the rider seat
1. Fold the rider seat down, and
then push it down to lock it in
place.
2. Remove the key from the main
switch if the scooter will be left
unattended.
TIP
Make sure that the seat is properly
secured before riding.
EAU14510
Storage compartment
1. Storage compartment
There is a storage compartment
under the seat. (See page 3-11).
EWA10960
sWARNING
●Do not exceed the load limit of
3.5 kg (7.7 lb) for the storage
compartment.
●Do not exceed the maximum
load of CS50/CS50M 169 kg
(373 lb) CS50Z 166 kg (366 lb)
for the vehicle.
1
1
1
INSTRUMENT AND CONTROL FUNCTIONS
3-11
3
Page 29 of 76

ECA10080
NOTICE
Keep the following points in mind
when using the storage compart-
ment.
●Since the storage compart-
ment accumulates heat when
exposed to the sun, do not sto-
re anything susceptible to heat
inside it.
●To avoid humidity from sprea-
ding through the storage com-
partment, wrap wet articles in
a plastic bag before storing
them in the compartment.
●Since the storage compart-
ment may get wet while the
scooter is being washed, wrap
any articles stored in the com-
partment in a plastic bag.
●Do not keep anything valuable
or breakable in the storage
compartment.
To store a helmet in the storage com-
partment, place the helmet upside-
down with the front facing forward.
TIP
●Some helmets cannot be stored
in the storage compartment
because of their size or shape.
●Do not leave your scooter unat-
tended with the seat open.
EAU14832
Adjusting the shock
absorber assembly
(Depends on models)
1. Spring preload adjusting ring
2. Position indicator
This shock absorber assembly is
equipped with a spring preload adjus-
ting ring.
ECA10101
NOTICE
To avoid damaging the mechanism,
do not attempt to turn beyond the
maximum or minimum settings.
INSTRUMENT AND CONTROL FUNCTIONS
3-12
3
Page 30 of 76

Adjust the spring preload as follows.
To increase the spring preload and
thereby harden the suspension, turn
the adjusting ring in direction (a). To
decrease the spring preload and the-
reby soften the suspension, turn the
adjusting ring in direction (b).
Align the appropriate notch in the
adjusting ring with the position indica-
tor on the shock absorber.
EWA10221
sWARNING
This shock absorber assembly
contains highly pressurized nitro-
gen gas. Read and understand the
following information before hand-
ling the shock absorber assembly.
●Do not tamper with or attempt
to open the cylinder assembly.
●Do not subject the shock
absorber assembly to an openflame or other high heat sour-
ce. This may cause the unit to
explode due to excessive gas
pressure.
●Do not deform or damage the
cylinder in any way. Cylinder
damage will result in poor
damping performance.
●Do not dispose of a damaged
or worn-out shock absorber
assembly yourself. Take the
shock absorber assembly to a
Yamaha dealer for any service.
EAUT1072
Luggage hookEWAT1031
sWARNING
●Do not exceed the load limit of
1.5 kg (3.3 lb) for the luggage
hook.
●Do not exceed the maximum
load of CS50/CS50M 169 kg
(373 lb) CS50Z 166 (366 lb) for
the vehicle.
1. Luggage hook
Spring preload setting:
Minimum (soft):
(b)
Standard:
middle
Maximum (hard):
(a)
INSTRUMENT AND CONTROL FUNCTIONS
3-13
3
Page 31 of 76
EAU15595
Inspect your vehicle each time you use it to make sure the vehicle is in safe operating condition. Always follow the ins-
pection and maintenance procedures and schedules described in the Owner’s Manual.
EWA11151
sWARNING
Failure to inspect or maintain the vehicle properly increases the possibility of an accident or equipment dama-
ge. Do not operate the vehicle if you find any problem. If a problem cannot be corrected by the procedures pro-
vided in this manual, have the vehicle inspected by a Yamaha dealer.
Before using this vehicle, check the following points:
FOR YOUR SAFETY – PRE-OPERATION CHECKS
4-1
4
Page 32 of 76

FOR YOUR SAFETY – PRE-OPERATION CHECKS
4-2
4
EAU15605
Pre-operation check list
ITEM CHECKS PAGE
• Check fuel level in fuel tank.
Fuel• Refuel if necessary.3-8
• Check fuel line for leakage.
• Check oil level in oil tank.
2-stroke engine oil• If necessary, add recommended oil to specified level. 3-10
• Check vehicle for oil leakage.
Final transmission oil• Check vehicle for oil leakage. 6-7
• Check coolant level in reservoir.
Coolant (CS50Z)• If necessary, add recommended coolant to specified level. 6-8
• Check cooling system for leakage.
• Check operation.
• If soft or spongy, have Yamaha dealer bleed hydraulic system.
• Check brake pads for wear.
Front brake• Replace if necessary. 6-13, 6-14, 6-15
• Check fluid level in reservoir.
• If necessary, add recommended brake fluid to specified level.
• Check hydraulic system for leakage.
• Check operation.
Rear brake• Lubricate cable if necessary.
• Check lever free play.6-13, 6-14
• Adjust if necessary.
• Make sure that operation is smooth.
Throttle grip• Check cable free play.
• If necessary, have Yamaha dealer adjust cable free play 6-10, 6-16
and lubricate cable and grip housing.
• Check for damage.
Wheels and tires• Check tire condition and tread depth.
• Check air pressure.6-11, 6-12
• Correct if necessary.