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 .
Vertical, four-stroke, single cylinder
49.5 cc, (3.02 cu-in)
2.7 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
Automatic wet multi-plate
Capacitance discharge ignition (CDI)
Unleaded gasoline (octane number 86 or higher)
Dimensions and Weight
Rato 50CC (RW139FMB)
Length, mm (in)
Width, mm (in)
Height, mm (in)
Dry weight, kg (lb)
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