The 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.
|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 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 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)|
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|
|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 type:||4-stroke engine oil|
|Recommended oil:||SAE 10W-30|
|Oil capacity:||1.2 L (1.27 US. qt, 1.06 Imp. qt.)|
|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)|
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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