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)
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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We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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