The Zongshen GB420S is a 420 cc, (25.63 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 construction machinery, pressure washers, water pumps, outboard engines.
The Zongshen GB420S 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 GB420S engine is equipped with a 7.5 L (1.98 US. gal. 1.65 Imp. gal.) fuel tank.
The Zongshen GB420S engine produced 12.2 PS (9.0 kW; 12.1 HP) at 3,600 rpm of maximum output power and 27 N·m (2.8 kg·m, 19.9 ft·lb) of peak torque.
|Engine type||4-stroke, OHV, single-cylinder|
|Displacement||420 cm3, (25.63 cu·in)|
|Max. horsepower||12.2 PS (9.0 kW; 12.1 HP) at 3,600 rpm|
|Max. torque||27 N·m (2.8 kg·m, 19.9 ft·lb)|
|Cooling system||Forced air|
|Ignition system||Transistorized ignition|
|Fuel tank capacity||7.5 L (1.98 US. gal. 1.65 Imp. gal.)|
|Fuel used||Unleaded gasoline (octane number 86 or higher)|
|Starting system||Recoil or electric starter|
|Stoping system||Ignition primary circuit ground|
|PTO shaft rotation||Counterclockwise (from PTO shaft side)|
|Dimensions (L x W X H)||456 x 355 x 459 mm (18 x 14 x 18.1 in)|
|Dry weight||30.5 kg (67.2 lbs)|
Cylinder Block and Head
A 90.0 mm (3.54 in) cylinder bore and 66.0 mm (2.6 in) piston stroke give the GB420S engine a total of 420 cc of displacement.
|Cylinder bore:||90.0 mm (3.54 in)|
|Piston stroke:||66.0 mm (2.6 in)|
|Number of piston rings (compression / oil):||2/1|
|Crankshaft center distance:||33 mm (1.3 in)|
|Maximum speed:||3,600 rpm rpm|
|Idle speed:||1,650±200 rpm rpm|
|Oil type:||4-stroke engine oil|
|Recommended oil:||SAE 10W-30|
|Oil capacity:||1.1 L (1.16 US. qt, 0.97 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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