The Zongshen GB620 is a 625 cc, (38.15 cu·in) single-cylinder air-cooled 4-stroke internal combustion small gasoline engine, from GB-series manufactured by Zongshen Power Co. for general-purpose applications.
The Zongshen GB620 engine has an overhead valve (OHV) design, carburetor fuel system, transistorized ignition system, and recoil or electric starter. The cylinder bore is 96.0 mm (3.78 in) and the piston stroke is 86.4 mm (3.4 in). Compression ratio rating is 8.6:1.
The Zongshen ZS GB620 produced 19 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) of maximum torque.
General information
| Engine Specifications | |
| Model | GB620 |
| Type | 4-stroke, OHV, single cylinder |
| Displacement | 625 cm2, (38.15 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) |
| Fuel system | Carburetor |
| Cooling system | Forced-air |
| Ignition system | Transistorized |
| Lubricating system | Splash system |
| Starting system | Recoil or electric starter |
| Fuel tank capacity | – |
| Fuel consumption | 370 g/kWh |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
| Zongshen ZS GB620 | |
| Length, mm (in) | 550 mm (21.7 in) |
| Width, mm (in) | 450 mm (21.3 in) |
| Height, mm (in) | 334 mm (13.1 in) |
| Dry weight, kg (lb) | 35 kg (77.2 lbs) |
Maintenance data
| Engine | |
| Maximum speed: | 3,600 rpm |
| Idle speed: | 1,440±140 rpm |
| Valve clearance | |
| Intake valve | 0.10 mm (0.004 in) |
| Exhaust valve | 0.10 mm (0.004 in) |
| Oil system | |
| Oil type | 4-stroke engines oil |
| Recommended oil | 10W-30 |
| Oil capacity | 1.4 L (1.48 US. qt, 1.23 Imp. qt.) |
| Ignition system | |
| Spark plug gap | 0.6-0.8 mm (0.024-0.031 in) |
| Spark plug torque | 20 N·m; 2.0 kg·m; 14.7 ft·lb |
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