The Zongshen GB420S is a 420 cc, (25.63 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 construction machinery, pressure washers, water pumps, outboard engines.
The Zongshen GB420S 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 GB420S engine is equipped with a 7.5 L (1.98 US. gal. 1.65 Imp. gal.) fuel tank.
The Zongshen GB420S engine 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 peak torque.
| Engine Specifications | |
| Engine model | GB420S |
| Engine type | 4-stroke, OHV, single-cylinder |
| Displacement | 420 cm3, (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) |
| Cooling system | Forced air |
| Lubricating system | Splash |
| Ignition system | Transistorized ignition |
| Fuel system | Carburetor |
| Fuel tank capacity | 7.5 L (1.98 US. gal. 1.65 Imp. gal.) |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Starting system | Recoil or electric starter |
| Stoping system | Ignition primary circuit ground |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 456 x 355 x 459 mm (18 x 14 x 18.1 in) |
| Dry weight | 30.5 kg (67.2 lbs) |
Cylinder Block and Head
A 90.0 mm (3.54 in) cylinder bore and 66.0 mm (2.6 in) piston stroke give the GB420S engine a total of 420 cc of displacement.
| Cylinder block | |
| Cylinder bore: | 90.0 mm (3.54 in) |
| Piston stroke: | 66.0 mm (2.6 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Crankshaft center distance: | 33 mm (1.3 in) |
| Cylinder head | |
| Valve arrangement: | OHV |
| Valves: | 2 |
Service Data
| Engine | |
| Maximum speed: | 3,600 rpm rpm |
| Idle speed: | 1,650±200 rpm rpm |
| Oil system | |
| Lubrication system: | Splash |
| Oil type: | 4-stroke engine oil |
| Recommended oil: | SAE 10W-30 |
| Oil capacity: | 1.1 L (1.16 US. qt, 0.97 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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