The Zongshen GB420S is a 420 cc, (25.63 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 GB420S engine has an overhead valve (OHV) design, carburetor fuel system, transistorized ignition system, and recoil or electric starter.
Cylinder bore and piston stroke are 90.0 mm (3.54 in) and 66.0 mm (2.6 in), respectively. The ZS GB420S produced 12.2 PS (9.0 kW; 12.1 HP) at 3,600 rpm of maximum output power and 27 N·m (2.8 kg·m, 19.9 ft·lb) of maximum torque.
General information
| Engine Specifications | |
| Model | GB420S |
| Type | 4-stroke, OHV, single cylinder |
| Displacement | 420 cm2, (25.63 cu·in) |
| Max. horsepower | 12.2 PS (9.0 kW; 12.1 HP) at 3,600 rpm |
| Max. torque | 27 N·m (2.8 kg·m, 19.9 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 | 7.5 L (1.98 US. gal. 1.65 Imp. gal.) |
| Fuel consumption | – |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
| Zongshen GB420S | |
| Length, mm (in) | 456 (18.0) |
| Width, mm (in) | 355 (14.0) |
| Height, mm (in) | 459 (18.1) |
| Dry weight, kg (lb) | 30.5 kg (67.2 lbs) |
Maintenance data
| Engine | |
| Maximum speed: | 3,600 rpm |
| Idle speed: | 1,600±150 rpm |
| Oil system | |
| Oil type | 4-stroke engines oil |
| Recommended oil | 10W-30 |
| Oil capacity | 1.1 L (1.16 US. qt, 0.97 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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