Zongshen GB420S

Zongshen GB420SThe 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
ModelGB420S
Type4-stroke, OHV, single cylinder
Displacement420 cm2, (25.63 cu·in)
Max. horsepower12.2 PS (9.0 kW; 12.1 HP) at 3,600 rpm
Max. torque27 N·m (2.8 kg·m, 19.9 ft·lb)
Fuel systemCarburetor
Cooling systemForced-air
Ignition systemTransistorized
Lubricating systemSplash system
Starting systemRecoil or electric starter
Fuel tank capacity7.5 L (1.98 US. gal. 1.65 Imp. gal.)
Fuel consumption
PTO shaft rotationCounterclockwise (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 type4-stroke engines oil
Recommended oil10W-30
Oil capacity1.1 L (1.16 US. qt, 0.97 Imp. qt.)
Ignition system
Spark plug gap0.6-0.8 mm (0.024-0.031 in)
Spark plug torque20 N·m; 2.0 kg·m; 14.7 ft·lb
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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

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