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)|