Rato RV140

Rato RV140The Rato RV140 is a 140 cc (9.15 cu-in) single-cylinder air-cooled 4-stroke internal combustion general-purpose gasoline engine with vertical shaft, manufactured by Chongqing RATO Holding (Group) CO., LTD for lawn mowers and tillers.

The Rato RV140 engine has a single-cylinder with a vertical shaft; an overhead valve (OHV) design; flat suction valve carburetor; dual element air filtration system; capacitance discharge type ignition system; centrifugal mechanical governor system and recoil starter.

The Rato RV140 motor has a 65.0 mm (2.56 in) cylinder bore and 42.0 mm (1.65 in) piston stroke with a compression ratio of 8.5:1. It produced 4.0 HP at 3,600 rpm of horsepower and 6.3 N·m (0.64 kg·m, 5.75 ft·lb) at 2,500 rpm of torque.

General information

Engine Specifications
Model RV140
Type 4-stroke, OHV, single cylinder
Displacement 140 cm 3 (8.54 cu-in)
Max. horsepower 4.0 HP at 3,600 rpm
Max. torque (crank PTO) 6.3 N·m (0.64 kg·m, 4.6 ft·lb) at 2,500 rpm
Carburetor Flat suction valve carburetor
Cooling system Forced-air
Ignition system Capacitance Discharge Ignition (CDI)
Lubricating system Splash
Starting system Recoil starter
Stoping system Ignition primary circuit ground
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity 1.0 L
PTO shaft rotation Counterclockwise (from PTO shaft side)

Service Information

Valve clearance (Cold)
Intake valve (COLD) 0.15 mm (0.006 in)
Exhaust valve (COLD) 0.20 mm (0.008 in)
Oil system
Oil type 4-stroke or an equivalent (SJ)
Recommended oil SAE 10W-30, 15W-40
Oil capacity 0.45 L
Ignition system
Spark plug NGK: BPR6ES
Spark plug gap 0.7-0.8 mm (0.028-0.031 in)
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    • Valve clearance is:
      Intake: 0.15 mm (0.006 in)
      Exhaust: 0.20 mm (0.008 in)
      The intake is the upper valve and the exhaust lower

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