The 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.
| Engine | |
| 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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