Zongshen GB680

Zongshen GB680The Zongshen GB680 is a 679 cc, (41.44 cu·in) V-twin air-cooled 4-stroke internal combustion small gasoline engine, from GB-series manufactured by Zongshen Power Co. for general-purpose applications.

The Zongshen GB680 engine has an overhead valve (OHV) design, carburetor fuel system, transistorized ignition system, and recoil or electric starter. The cylinder bore is 78.0 mm (3.07 in) and the piston stroke is 71.0 mm (2.8 in). Compression ratio rating is 8.5:1.

The Zongshen GB680 produced 19.7 PS (14.5 kW; 19.4 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
Model GB680
Type 4-stroke, OHV, V-twin
Displacement 679 cm2, (41.44 cu·in)
Max. horsepower 19.7 PS (14.5 kW; 19.4 HP) at 3,600 rpm
Max. torque 42 N·m (4.3 kg·m, 31 ft·lb)
Fuel system Carburetor
Cooling system Forced-air
Ignition system Transistorized
Lubricating system Splash system
Starting system Recoil or electric starter
Fuel tank capacity
Fuel consumption 370 g/kWh
PTO shaft rotation Counterclockwise (from PTO shaft side)

Dimensions and Weight

Zongshen GB680
Length, mm (in) 462 mm (18.2 in)
Width, mm (in) 428 mm (16.9 in)
Height, mm (in) 456 mm (18.0 in)
Dry weight, kg (lb) 46.5 kg (102.5 lbs)

Maintenance data

Maximum speed: 3,900 rpm
Idle speed: 1,440±140 rpm
Valve clearance
Intake valve 0.10-0.15 mm (0.004-0.006 in)
Exhaust valve 0.15-0.20 mm (0.006-0.008 in)
Oil system
Oil type 4-stroke engines oil
Recommended oil 10W-30
Oil capacity 1.2 L (1.27 US. qt, 1.06 Imp. qt.)
Ignition system
Spark plug gap 0.6-0.8 mm (0.024-0.031 in)
Spark plug torque 20 N·m; 2.0 kg·m; 14.7 ft·lb
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