Zongshen GB750S

Zongshen GB750SThe Zongshen GB750S is a 750 cc, (45.8 cu·in) natural aspirated V-twin cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Zongshen Power Co for construction machinery and generators.

The Zongshen GB750S engine has a V-twin 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 GB750S engine produced 21.8 PS (16.0 kW; 21.5 HP) at 3,900 rpm of maximum output power and 47 N·m (4.8 kg·m, 34.6 ft·lb) of peak torque.

General information

Engine Specifications
Engine model GB750S
Engine type 4-stroke, OHV, V-twin
Displacement 750 cm3, (45.8 cu·in)
Max. horsepower 21.8 PS (16.0 kW; 21.5 HP) at 3,900 rpm
Max. torque 47 N·m (4.8 kg·m, 34.6 ft·lb) at rpm
Cooling system Forced air
Lubricating system Splash
Ignition system Transistorized ignition
Fuel system Carburetor
Fuel consumption 370 g/kWh
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil or electric starter
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) 456 x 428 x 464 mm (18 x 16.9 x 18.3 in)
Dry weight 43.5 kg (95.9 lbs)

Cylinder Block and Head

Cylinder bore and piston stroke are 82.0 mm (3.23 in) and 71.0 mm (2.8 in), respectively.

Cylinder block
Cylinder bore: 82.0 mm (3.23 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)
Cylinder head
Valve arrangement: OHV

Service Data

Maximum speed: 3,900 rpm rpm
Idle speed: 1,750±150 rpm rpm
Oil system
Lubrication system: Splash
Oil type: 4-stroke engine oil
Recommended oil: SAE 10W-30
Oil capacity: 1.5 L (1.59 US. qt, 1.32 Imp. qt.)
Fuel system
Type: Carburetor
Ignition system
Type: Transistorized ignition
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)

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