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
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