Page 44 of 80
PERIODIC MAINTENANCE AND MINOR REPAIR
6
1
ZAUM0170
1
ZAUM0318
1
4 32
ZAUM0156
1. Air filter case cover1. Air filter element
EAUM0071
Cleaning the air filter element
The air filter element should be cleaned
at the intervals specified in the periodic
maintenance and lubrication chart.
Clean the air filter element more
frequently if you are riding in unusually
wet or dusty areas.
1. Remove the air filter case cover
by removing the screws.2. Pull the air filter element out, clean
it with solvent, and then squeeze
the remaining solvent out.
EW000075
Use only a dedicated parts cleaning
solvent. To avoid the risk of fire or
explosion, do not use gasoline or
solvents with a low flash point.
EC000089
To avoid damaging the foam material,
handle it gently and carefully, and do
not twist or wring it.3. Apply oil of the recommended
type to the entire surface of the
element, and then squeeze the
excess oil out.
NOTE :
The air filter element should be wet but
not dripping.
Recommended oil:
Engine oil
6-7
Page 50 of 80
PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU04502
Rear brake shoes
The rear brake is provided with a wear
indicator, which allows you to check the
brake shoe wear without having to
disassemble the brake. To check the
brake shoe wear, check the position of
the wear indicator while applying the
brake. If a brake shoe has worn to the
point that the wear indicator reaches
the wear limit line, have a Yamaha dea-
ler replace the brake shoes as a set.
1
2
ZAUM0059
1. Wear indicator
2. Wear limit
1
ZAUM0158
1. Minimum level mark
6-13
EAU00732
Checking the brake fluid level
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 brake fluid
level may indicate worn brake pads and/
or brake system leakage. If the brake
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 quality
brake fluid, otherwise the rubber
seals may deteriorate, causing
leakage and poor braking perfor-
mance.
Recommended brake fluid:
DOT 4
NOTE :
If DOT 4 is not available, DOT 3 can be
used.
•Refill with the same type of brake
fluid. Mixing fluids may result in a
harmful chemical reaction and lead
to poor braking performance.
•Be careful that water does not en-
ter the master cylinder when
refilling. Water will significantly
lower the boiling point of the fluid
and may result in vapor lock.
Page 68 of 80
SPECIFICATIONS
8
8-1 Model EW50
Dimensions:
Overall length 1,785 mm
Overall width 668 mm
Overall height 1,077 mm
Seat height 787 mm
Wheelbase 1,202 mm
Minimum ground clearance 185 mm
Minimum turning radius 1,800 mm
Weight:
Wet (with oil and a full fuel tank) 81 kg
Engine:
Engine type Air cooled, 2strokes
Cylinder arrangement Single cylinder, vertical
Displacement 49.2 cc
Bore x stroke 40.0 x 39.2 mm
Compression ratio 11.2:1
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 or ISO EG-C, EG-D
Quantity 1.3 LFinal transmission oil:
Type SAE 10W30 type SE
Capacity 0.11L
Air filter type:Wet type element
Fuel:
Recommended fuel Regular unleaded gasoline
(RON 91 mini)
Fuel tank capacity 6.5 L
Carburetor:
Type/quantity TK ø12
Manufacturer TEIKEI
Spark plug:
Type / Manufacturer BR8HS / NGK or BR9HS/NGK
Spark plug gap 0.5—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 42/13 (3.230)
Transmission type V-belt automatic
Operation Centrifugal automatic type
Chassis:
Frame type Steel tube underbone
Caster angle 27°
Trail 90 mm
Specifications
Page 69 of 80
SPECIFICATIONS
8
8-2 Tires:
Front:
Type Tubeless
Size / Manufacturer / model 120/80-12 55L / MICHELIN
/ BOPPER
120/80-12 55J / CHENG SHIN
/ MAXXIS
Rear:
Type Tubeless
Size / Manufacturer / model 130/90-10 61L / MICHELIN
/ BOPPER
130/90-10 61J / CHENG SHIN
/ MAXXIS
Maximum load * 184 kg
Air pressure (cold tire):
Up to 90 kg load*
Front 150 kPa (1,5 kgf/cm
2, 1,5 bar)
Rear 150 kPa (1,5 kgf/cm2, 1,5 bar)
90 kg load—maximum load *
Front 150 kPa (1,5 kgf/cm
2, 1,5 bar)
Rear 170 kPa (1,7 kgf/cm2, 1,7 bar)
* Total weight of rider, passenger, cargo and accessories
Minimum tire tread depth 1.6 mmWheels:
Front
Type Cast wheel/Aluminium
Size 12 X MT 2.75
Rear
Type Cast wheel/aluminium
Size 10 X MT 3.00
Brakes:
Front
Type Single disc brake
Operation Right hand operation
Type brake fluid DOT 4 or DOT 3
Rear
Type Drum brake
Operation Left hand operation
Suspension:
Front suspension Telescopic fork
Rear suspension Unit swing
Shock absorber:
Front fork type Coil spring/oil damper
Rear shock absorber Coil spring/oil damper
assembly type
Wheel travel:
Front wheel travel 104 mm
Rear wheel travel 100 mm
Page 70 of 80
SPECIFICATIONS
8
8-3 Electrical:
Ignition system type C.D.I
Charging system Flywheel magneto
Battery Model GM4-3B, YB4L-B, FB4-B
Voltage/capacity 12 V / 4 Ah
Headlight type:Bulb
Bulbs (voltage/wattage x quantity):
Headlight 12V, 35W/35Wx1
Tail/brake light 12V, 5W/21Wx1
Turn signal light
Front 12V, 10Wx2
Rear 12V, 10Wx2
Meter lights 12V, 1.2Wx2
High beam indicator light 12V, 2Wx1
Turn signal indicator light 12V, 2Wx1
Oil level warning light 12V, 2Wx1
Fuel level warning light 12V, 2Wx1
Fuses:
Main fuse 7A
