Yamaha 2002 YB50, Service Manual

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SPEC
GENERAL SPECIFICATIONS
2-1
Model YN50R
Engine:
Engine type Reed valve, petrol, 2-stroke, air-cooled
Arrangement of cylinders One cylinder inclined to the front
Cylinder capacity 49.2 cc
Diameter and stroke 40.0 x 39.2 mm
Compression ratio 11.6:1 5AD 10.2:1 SA15 11:1 SA19
Starter system Electrical and pedal kickstart
Lubrication system: Yamaha autolubrication
Type or grade of oil:
Engine oil 2-stroke air-cooled engine oil
Transmission oil SE type 10W30 SAE engine oil
Oil capacity:
Oil sump (engine oil) 1.2 L
Transmission oil
Periodic change of oil 0.10 L
Total quantity 0.11 L
Air filter: Flue type
Fuel:
Type Unleaded petrol
Fuel tank capacity 6.5 L
Carburettor:
Type/Manufacturer PHVA/DELLORTO/PY12,1/GURTNER
Spark plug: 5AD y SA15 SA19
Type/Manufacturer BR8HS/N.G.K. BPR4HS/NGK
Distance between electrodes 0.6 ~ 0,7 mm 0.6 ~ 0.7 mm
Clutch type: Dry, automatic centrifugal
Transmission:
Primary reduction system Helicoidal gearing
Primary reduction ratio 52/13 (4.00)
Secondary reduction system Straight gearing
Secondary reduction ratio 42/13(3.230) 5AD-SA15 45/12(33.750) SA19
Type of transmission Automatic one speed
(Trapezoidal belt type)
Action Automatic centrifuge type
Chassis:
Frame Steel underside of pipe
Inclination angle of front axle 26,5°
Trail 92.5 mm
Tyres:
Size (FR) 120/70-12
Size (R) 130/70-12
Tyre pressures (cold):
(Front) 1.75 kg/cm
2
(Rear) 2.00 kg/cm
2