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
ModelRV140
Type4-stroke, OHV, single cylinder
Displacement140 cm 3 (8.54 cu-in)
Max. horsepower4.0 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
CarburetorFlat suction valve carburetor
Cooling systemForced-air
Ignition systemCapacitance Discharge Ignition (CDI)
Lubricating systemSplash
Starting systemRecoil starter
Stoping systemIgnition primary circuit ground
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity1.0 L
PTO shaft rotationCounterclockwise (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 type4-stroke or an equivalent (SJ)
Recommended oilSAE 10W-30, 15W-40
Oil capacity0.45 L
Ignition system
Spark plugNGK: BPR6ES
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

4 Comments

    • 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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