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
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

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
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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