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 | |
| Model | 50CC (RW139FMB) |
| Type | Vertical, four-stroke, single cylinder |
| Displacement | 49.5 cc, (3.02 cu-in) |
| Max. horsepower | 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 |
| Clutch method | Automatic wet multi-plate |
| Gearshift method | 4-speed gearshift |
| Cooling system | Forced-air |
| Ignition system | Capacitance discharge ignition (CDI) |
| Lubricating system | Splash |
| Starting system | Kick |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel consumption | 367 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 capacity | 0.7 L |
| Ignition system | |
| Spark plug | A7RTC |
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