Zongshen GB620

Zongshen GB620The Zongshen GB620 is a 625 cc (38.2 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Zongshen Power Co for general-purpose applications.

The Zongshen GB620 engine has a single-cylinder, overhead valve (OHV) design, and recoil or electric starter. This engine used a carburetor fuel system, transistorized magneto ignition system, splash type lubricating system and forced-air cooling system.

The Zongshen GB620 engine produced 19.0 PS (14 kW; 18.8 HP) at 3,600 rpm of maximum output power and 42 N·m (4.3 kg·m, 31 ft·lb) at rpm of peak torque.

General information

Engine Specifications
Engine model GB620
Engine type 4-stroke, OHV, single-cylinder
Displacement 625 cm3, (38.2 cu·in)
Max. horsepower 19 PS (14 kW; 18.8 HP) at 3,600 rpm
Max. torque 42 N·m (4.3 kg·m, 31 ft·lb) at rpm
Cooling system Forced air
Lubricating system Splash type
Ignition system Transistorized ignition
Fuel system Carburetor
Fuel consumption 370 g/kWh
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil / electric starter
Stoping system Ignition primary circuit ground
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) 550 x 540 x 334 mm (21.7 x 21.3 x 13.1 in)
Dry weight 35 kg (77.2 lbs)

Cylinder Block and Head

It has a 96.0 mm (3.78 in) cylinder bore and 86.4 mm (3.4 in) piston stroke. Compression ratio rating is 8.6:1.

Cylinder block
Compression ratio: 8.6:1
Cylinder bore: 96.0 mm (3.78 in)
Piston stroke: 86.4 mm (3.4 in)
Crankshaft center distance: 43.2 mm (1.7 in)
Cylinder head
Valve arrangement: OHV
Valves:: 2

Service Data

The SAE 10W-30 engine oil, API service classification SE class or equivalent is recommended for the GB620. Refilling oil capacity is 1.4 L (1.48 US. qt, 1.23 Imp. qt.).

The valve clearance is 0.10 mm (0.0039 in) for intake valves and 0.10 mm (0.0039 in) for exhaust valves.

Maximum speed: 3,600 rpm
Idle speed: 1,450±150 rpm
Valve clearance
Intake valve clearance (COLD): 0.10 mm (0.0039 in)
Exhaust valve clearance (COLD): 0.10 mm (0.0039 in)
Oil system
Lubrication system: Splash type
Oil type: 4-stroke engine oil
Recommended oil: SAE 10W-30
Oil capacity: 1.4 L (1.48 US. qt, 1.23 Imp. qt.)
Fuel system
Type: Carburetor
Ignition system
Type: Transistorized ignition
Spark plug gap: 0.6-0.8 mm (0.0236-0.0315 in)
Spark plug torque: 20 N·m (2 kg·m, 14.7 ft·lb)

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