Zongshen GB680

Zongshen GB680The Zongshen GB680 is a 679 cc, (41.4 cu·in) natural aspirated V-twin cylinders four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Zongshen Power Co for general-purpose applications.

The Zongshen GB680 engine has V-twin cylinders, an overhead valve (OHV) design, and a 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 GB680 engine produced 19.7 PS (14.5 kW; 19.4 HP) at 3,600 rpm of maximum horsepower and 42 N·m (4.3 kg·m, 31 ft·lb) at rpm of maximum torque.

General information

Engine Specifications
Engine model GB680
Engine type 4-stroke, OHV, two-cylinders
Displacement 679 cm3, (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) at rpm
Cooling system Forced air
Lubricating system Splash type
Ignition system Transistorized ignition
Fuel system Carburetor
Fuel consumption 370 g/kWh
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil / electric starter
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) 462 x 428 x 456 mm (18.2 x 16.9 x 18 in)
Dry weight 46.5 kg (102.5 lbs)

Cylinder Block and Head

A 78.0 mm (3.07 in) cylinder bore and 71.0 mm (2.8 in) piston stroke give the GB680 engine a total of 679 cc of displacement. The compression ratio rating is 8.5:1.

Cylinder block
Compression ratio: 8.5:1
Cylinder bore: 78.0 mm (3.07 in)
Piston stroke: 71.0 mm (2.8 in)
Number of piston rings (compression / oil): 2/1
Crankshaft center distance: 35.5 mm (1.4 in)
Cylinder head
Valve arrangement: OHV

Service Data

The 4-stroke engine oil with a viscosity of SAE 10W-30 is recommended for the GB680, refilling oil capacity is 1.2 L (1.27 US. qt, 1.06 Imp. qt.). The valve clearance is 0.10-0.15 mm (0.0039-0.0059 in) for intake valves and 0.15-0.20 mm (0.006-0.008 in) for exhaust valves.

Maximum speed: 3,900 rpm
Idle speed: 1,450±150 rpm
Valve clearance
Intake valve clearance (COLD): 0.10-0.15 mm (0.0039-0.0059 in)
Exhaust valve clearance (COLD): 0.15-0.20 mm (0.0059-0.0079 in)
Oil system
Lubrication system: Splash
Oil type: 4-stroke engine oil
Recommended oil: SAE 10W-30
Oil capacity: 1.2 L (1.27 US. qt, 1.06 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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