Rato R670

Rato R670The Rato R670 is a 670 cc (40.9 cu-in) V-twin cylinder air-cooled four-stroke internal combustion small gasoline engine with horizontal shaft manufactured by Chongqing RATO Holding (Group) CO., LTD. The R670 is used for generators, hot water pressure washers, agricultural equipment.

The Rato R670 engine has an OHV (overhead valve) design with 90° V-twin cylinders; flat suction valve carburetor; recoil starter or electric starter, transistorized magneto ignition (TCI) system and centrifugal mechanical governor system.

The Rato R670 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
ModelR670
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 systemTransistorized magneto ignition (TCI)
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

Engine
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 typeHonda 4-stroke or an equivalent (SG or SF)
Recommended oilSAE 10W-30
Oil capacity1.90 L
Oil change intervalEvery 6 month or 100 Hrs.
Ignition system
Spark plugNGK: ZGR5A
DENSO: J16CR-U
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
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