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
Model RV670
Type 4-stroke, OHV, 90° V-twin
Displacement 670 cm 3 (40.9 cu-in)
Max. horsepower 23.0 HP at 3,600 rpm
Max. torque (crank PTO) 45 N·m (4.58 kg·m, 19.9 ft·lb) at 2,500 rpm
Carburetor Flat suction valve carburetor
Cooling system Forced-air
Ignition system Inductance Discharge Type
Lubricating system Splash
Starting system Recoil / electric starter
Stoping system Ignition primary circuit ground
Fuel used Unleaded gasoline (octane number 86 or higher)
PTO shaft rotation Counterclockwise (from PTO shaft side)

Service Information

Maximum speed 3,850 ± 100 rpm
Idle speed 1,400 ± 150 rpm
Cylinder compression 6.0-8.0 kg/cm2 (85-114 psi) at 500 rpm
Valve clearance
Intake valve clearance 0.15±0.02 mm (0.006±0.001 in)
Exhaust valve clearance 0.20±0.02 mm (0.008±0.001 in)
Oil system
Oil type API SG or SF
Recommended oil SAE 10W-30
Oil capacity 1.90 L
Oil change interval Every 6 month or 100 Hrs.
Ignition system
Spark plug NGK: ZGR5A
Spark plug gap 0.7-0.8 mm (0.028-0.031 in)
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