Zongshen GB420S

Zongshen GB420SThe 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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