The 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
| Engine | |
| 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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