Rato 50CC (RW139FMB)

Rato 50CC (RW139FMB)The Rato 50CC (RW139FMB) is a 49.5 cc, (3.02 cu-in) single-cylinder air-cooled 4-stroke internal combustion horizontal motorcycle engine manufactured by Chongqing RATO Holding (Group) CO., LTD.

The Rato 50CC engine uses CDI (capacitance discharge ignition system), the centrifugal automatic clutch to smoothen the gearshift and improve the driving comfortableness, kick starter and 4-speed gearbox.

The engine cylinder bore is 39 mm (1.54 in) and piston stroke is 41.4 mm (1.63 in). The 50CC (RW139FMB) produced 2.7 PS (2.0 KW; 2.7 HP) at 7,500 rpm of maximum horsepower and 2.5 Nm (0.26 kg·m; 1.85 ft·lb) at 5,500 rpm of torque .

General information

Engine Specifications
Model50CC (RW139FMB)
TypeVertical, four-stroke, single cylinder
Displacement49.5 cc, (3.02 cu-in)
Max. horsepower2.7 PS (2 KW; 2.7 HP) at 7,500 rpm
Max. torque (crank PTO)2.5 Nm (0.26 kg·m; 1.85 ft·lb) at 5,500 rpm
Clutch methodAutomatic wet multi-plate
Gearshift method4-speed gearshift
Cooling systemForced-air
Ignition systemCapacitance discharge ignition (CDI)
Lubricating systemSplash
Starting systemKick
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel consumption367 g/kw·h

Dimensions and Weight

Rato 50CC (RW139FMB)
Length, mm (in)430 (16.9)
Width, mm (in)290 (11.4)
Height, mm (in)210 (8.3)
Dry weight, kg (lb)20 (44.1)

Service Information

Oil system
Oil capacity0.7 L
Ignition system
Spark plugA7RTC
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