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 modelGB680
Engine type4-stroke, OHV, two-cylinders
Displacement679 cm3, (41.44 cu·in)
Max. horsepower19.7 PS (14.5 kW; 19.4 HP) at 3,600 rpm
Max. torque42 N·m (4.3 kg·m, 31 ft·lb) at rpm
Cooling systemForced air
Lubricating systemSplash type
Ignition systemTransistorized ignition
Fuel systemCarburetor
Fuel consumption370 g/kWh
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemRecoil / electric starter
PTO shaft rotationCounterclockwise (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 weight46.5 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
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)
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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We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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