The Zongshen GB620 is a 625 cc (38.2 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Zongshen Power Co for general-purpose applications.
The Zongshen GB620 engine has a single-cylinder, overhead valve (OHV) design, and 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 Zongshen GB620 engine produced 19.0 PS (14 kW; 18.8 HP) at 3,600 rpm of maximum output power and 42 N·m (4.3 kg·m, 31 ft·lb) at rpm of peak torque.
|Engine type||4-stroke, OHV, single-cylinder|
|Displacement||625 cm3, (38.2 cu·in)|
|Max. horsepower||19 PS (14 kW; 18.8 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|
|Stoping system||Ignition primary circuit ground|
|PTO shaft rotation||Counterclockwise (from PTO shaft side)|
|Dimensions (L x W X H)||550 x 540 x 334 mm (21.7 x 21.3 x 13.1 in)|
|Dry weight||35 kg (77.2 lbs)|
Cylinder Block and Head
It has a 96.0 mm (3.78 in) cylinder bore and 86.4 mm (3.4 in) piston stroke. Compression ratio rating is 8.6:1.
|Cylinder bore:||96.0 mm (3.78 in)|
|Piston stroke:||86.4 mm (3.4 in)|
|Crankshaft center distance:||43.2 mm (1.7 in)|
The SAE 10W-30 engine oil, API service classification SE class or equivalent is recommended for the GB620. Refilling oil capacity is 1.4 L (1.48 US. qt, 1.23 Imp. qt.).
The valve clearance is 0.10 mm (0.0039 in) for intake valves and 0.10 mm (0.0039 in) for exhaust valves.
|Maximum speed:||3,600 rpm|
|Idle speed:||1,450±150 rpm|
|Intake valve clearance (COLD):||0.10 mm (0.0039 in)|
|Exhaust valve clearance (COLD):||0.10 mm (0.0039 in)|
|Lubrication system:||Splash type|
|Oil type:||4-stroke engine oil|
|Recommended oil:||SAE 10W-30|
|Oil capacity:||1.4 L (1.48 US. qt, 1.23 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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