Rato RBX250 (RW170MM)

Rato RBX250 (RW170MM)The Rato RBX250 (RW170MM) is a 250.1 cc (15.3 cu-in) single-cylinder water-cooled 4-stroke internal combustion vertical motorcycle engine, manufactured by Chongqing RATO Holding (Group) CO., LTD.

The Rato ATW250 has four valves, this structure generating the high air-charging efficiency, more rapid and full burning and stronger power. Overhead double cam direct-driven air valve with the precise transmission, sound rigidity, low movement inertia, few abrasion and high reliability of valve gear. The engine uses a water-cooling system with the large flow to maintain the engine to work under the appropriate temperature and extend the engine’s lifetime. The engine is equipped with capacitance discharge ignition system (CDI), electric starter and 6-speed gearbox.

The engine cylinder bore is 70.0 mm (2.75 in) and piston stroke is 65.0 mm (2.55 in). The RBX250 (RW170MM) produced 25.8 PS (19.0 kW; 25.5 HP) at 8,000 rpm of maximum horsepower and 23.0 N·m (2.34 kg·m, 16.9 ft·lb) at 7,000 rpm of torque.

General information

Engine Specifications
ModelRBX250 (RW170MM)
TypeVertical, four-stroke, single cylinder
Displacement250.1 ml (15.3 cu-in)
Max. horsepower25.8 PS (19.0 kW; 25.5 HP) at 8,000 rpm
Max. torque (crank PTO)23.0 N·m (2.34 kg·m, 16.9 ft·lb) at 7,000 rpm
ClutchManual wet multi-plate
Gearshift method6-International
Cooling systemForced-air
Ignition systemCapacitance discharge ignition (CDI)
Lubricating systemSplash
Starting systemElectric
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel consumption354 g/kw·h

Dimensions and Weight

Rato RBX250 (RW170MM)
Length, mm (in)335 (13.2)
Width, mm (in)350 (13.8)
Height, mm (in)460 (18.1)
Dry weight, kg (lb)34.0 (74.9)

Service Information

Oil system
Oil capacity1.3 L
Ignition system
Spark plugCR8E
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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