Rato RV670

Rato RV670 vertical shaft engineThe Rato RV670 is a 670 cc (40.9 cu-in) V-twin cylinder air-cooled four-stroke internal combustion small gasoline engine with vertical shaft manufactured by Chongqing RATO Holding (Group) CO., LTD. The R670 is used for generators, hot water pressure washers, agricultural equipment.

The Rato RV670 engine has an OHV (overhead valve) design with 90° V-twin cylinders; flat suction valve carburetor; recoil starter or electric starter, Inductance Discharge Type ignition system and centrifugal mechanical governor system.

The Rato RV670 motor has a 78.0 mm (3.07 in) cylinder bore and 70.0 mm (2.76 in) piston stroke with a compression ratio of 8.1:1. It produced 23.0 HP at 3,600 rpm of horsepower and 45 N·m (4.58 kg·m, 19.9 ft·lb) at 2,500 rpm of torque.

General information

Engine Specifications
Type4-stroke, OHV, 90° V-twin
Displacement670 cm 3 (40.9 cu-in)
Max. horsepower23.0 HP at 3,600 rpm
Max. torque (crank PTO)45 N·m (4.58 kg·m, 19.9 ft·lb) at 2,500 rpm
CarburetorFlat suction valve carburetor
Cooling systemForced-air
Ignition systemInductance Discharge Type
Lubricating systemSplash
Starting systemRecoil / electric starter
Stoping systemIgnition primary circuit ground
Fuel usedUnleaded gasoline (octane number 86 or higher)
PTO shaft rotationCounterclockwise (from PTO shaft side)

Service Information

Maximum speed3,850 ± 100 rpm
Idle speed1,400 ± 150 rpm
Cylinder compression6.0-8.0 kg/cm2 (85-114 psi) at 500 rpm
Valve clearance
Intake valve clearance0.15±0.02 mm (0.006±0.001 in)
Exhaust valve clearance0.20±0.02 mm (0.008±0.001 in)
Oil system
Oil typeAPI SG or SF
Recommended oilSAE 10W-30
Oil capacity1.90 L
Oil change intervalEvery 6 month or 100 Hrs.
Ignition system
Spark plugNGK: ZGR5A
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
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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