Zongshen GB620

Zongshen GB620The Zongshen GB620 is a 625 cc, (38.15 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 GB620 engine has an overhead valve (OHV) design, carburetor fuel system, transistorized ignition system, and recoil or electric starter. The cylinder bore is 96.0 mm (3.78 in) and the piston stroke is 86.4 mm (3.4 in). Compression ratio rating is 8.6:1.

The Zongshen ZS GB620 produced 19 PS (14 kW; 18.8 HP) at 3,600 rpm of maximum output power and 42 N·m (4.3 kg·m, 31 ft·lb) of maximum torque.

General information

Engine Specifications
Type4-stroke, OHV, single cylinder
Displacement625 cm2, (38.15 cu·in)
Max. horsepower19 PS (14 kW; 18.8 HP) at 3,600 rpm
Max. torque42 N·m (4.3 kg·m, 31 ft·lb)
Fuel systemCarburetor
Cooling systemForced-air
Ignition systemTransistorized
Lubricating systemSplash system
Starting systemRecoil or electric starter
Fuel tank capacity
Fuel consumption370 g/kWh
PTO shaft rotationCounterclockwise (from PTO shaft side)

Dimensions and Weight

Zongshen ZS GB620
Length, mm (in)550 mm (21.7 in)
Width, mm (in)450 mm (21.3 in)
Height, mm (in)334 mm (13.1 in)
Dry weight, kg (lb)35 kg (77.2 lbs)

Maintenance data

Maximum speed:3,600 rpm
Idle speed:1,440±140 rpm
Valve clearance
Intake valve0.10 mm (0.004 in)
Exhaust valve0.10 mm (0.004 in)
Oil system
Oil type4-stroke engines oil
Recommended oil10W-30
Oil capacity1.4 L (1.48 US. qt, 1.23 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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