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
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.
6. Refill with the specified amount
of the recommended final trans-
mission oil, and then install and
tighten the oil filler cap. WAR-
NING! Make sure that no
foreign material enters the final
transmission case. Make sure
that no oil gets on the tire or
wheel.
[EWA11311]
7. Check the final transmission case
for oil leakage. If oil is leaking,
check for the cause.
EAUS1200
Coolant (CS50Z)
The coolant level should be checked
before each ride. In addition, the coo-
lant must be changed at the intervals
specified in the periodic maintenance
and lubrication chart.
EAUM2102
To check the coolant level
1. Place the vehicle on a level surfa-
ce and hold it in an upright posi-
tion.
TIP
●The coolant level must be chec-
ked on a cold engine since the
level varies with engine tempera-
ture.
●Make sure that the vehicle is
positioned straight up when
checking the coolant level. A
slight tilt to the side can result in
a false reading.
2. Check the coolant level through
the check window.
TIP
The coolant should be between the
minimum and maximum level marks.
1. Coolant level check window
2. Maximum level mark
3. Minimum level mark
3. If the coolant is at or below the
minimum level mark, remove the
cowling A. (See page 6-5).
4. Open the reservoir cap, and then
add coolant to the maximum
level mark. WARNING! Remove
only the coolant reservoir cap.
Never attempt to remove the
radiator cap when the engine is
hot.
[EWA15161]. NOTICE: If coolant
is not available, use distilled
MAX
MIN2
3
1
Recommended final transmission
oil:
See page 8-1
Oil quantity:
0.11 L (0.12 US qt, 0.10 Imp.qt)
Tightening torque:
Final transmission oil drain bolt:
18 Nm (1.8 m•kgf, 13.0 ft•lbf)
PERIODIC MAINTENANCE AND ADJUSTMENT
6-8
6
EAU32344
Checking the brake fluid
level
1. Minimum level mark
Insufficient brake fluid may allow air
to enter the brake system, possibly
causing it to become ineffective.
Before riding, check that the brake
fluid is above the minimum level mark
and replenish if necessary. A low bra-
ke fluid level may indicate worn brake
pads and/or brake system leakage. If
the brake fluid level is low, be sure to
check the brake pads for wear and
the brake system for leakage.Observe these precautions:
●When checking the fluid level,
make sure that the top of the
master cylinder is level by turning
the handlebars.
●Use only the recommended qua-
lity brake fluid, otherwise the rub-
ber seals may deteriorate, cau-
sing leakage and poor braking
performance.
●Refill with the same type of brake
fluid. Mixing fluids may result in a
harmful chemical reaction and
lead to poor braking performan-
ce.
●Be careful that water does not
enter the master cylinder when
refilling. Water will significantly
lower the boiling point of the fluid
and may result in vapor lock.
●Brake fluid may deteriorate pain-
ted surfaces or plastic parts.
Always clean up spilled fluid
immediately.
●As the brake pads wear, it is nor-
mal for the brake fluid level to
gradually go down. However, if
the brake fluid level goes down
suddenly, have a Yamaha dealer
check the cause.
Recommended brake fluid:
DOT 4
M
IN
1
PERIODIC MAINTENANCE AND ADJUSTMENT
6-15
6
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
Size:
110/70-12 47L
Manufacturer/model:
CHENG SHIN TIRE / C922
Rear tire:
Type:
Tubeless
Size:
120/70-12 51L 130/70-12 56L
Manufacturer/model:
CHENG SHIN TIRE / C922
Loading:Maximum load:
CS50/CS50M: 169 kg (372 lb)
CS50Z: 166 kg (366 lb)
Tire air pressure (measured on cold
tires):
Loading condition:
0–90 kg (0–198 lb)
Front:
175 kPa (1.75 kgf/cm
2, 25 psi,
1.75 bar)
Rear:
200 kPa (2.00 kgf/cm
2, 29 psi,
2.00 bar)
90 kg (198 lb) - maximum load
Front:
175 kPa (1.75 kgf/cm
2, 25 psi,
1.75 bar)
Rear:
225 kPa (2.25 kgf/cm
2, 33 psi,
2.25 bar)
Front wheel:Wheel type:
Cast wheel
Rim size:
MT 2.75X12
Rear wheel:Wheel type:
Cast wheel
Rim size:
MT 3.00X12
Front brake:Type:
Single disc brake
Operation:
Right hand operation
Recommended fluid:
DOT 4
Rear brake:Type:
Drum brake
Operation:
Left hand operation
Front suspension:Type:
Telescopic fork
Spring/shock absorber type:
Coil spring/oil damper
Wheel travel:
70.0 mm (2.76 in)
Rear suspension:Type:
Unit swingSpring/shock absorber type:
Coil spring/oil damper
Coil spring/gas-oil damper (depens on
models)
Wheel travel:
60.0 mm (2.36 in)
Electrical system:Ignition system:
CDI
Charging system:
Flywheel magneto
Battery:Model:
GT4L-BS
Voltage, capacity:
12 V, 4.0 Ah
Headlight:Bulb type:
Incandescence
Bulb voltage, wattage x quantity:Headlight:
12 V, 35 W/35.0 W x 1
Tail/brake light:
12 V, 21.0 W/5.0 W x 1
Front turn signal light:
12 V, 10.0 W x 2
Rear turn signal light:
12 V, 10.0 W x 2
Auxiliary light:
12 V, 5.0 W x 2
Meter lighting:
12 V, 1.2 W x 2
High beam indicator light:
12 V, 1.2 W x 1
SPECIFICATIONS
8-2
8