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 modelGB750S
Engine type4-stroke, OHV, V-twin
Displacement750 cm3, (45.8 cu·in)
Max. horsepower21.8 PS (16.0 kW; 21.5 HP) at 3,900 rpm
Max. torque47 N·m (4.8 kg·m, 34.6 ft·lb) at rpm
Cooling systemForced air
Lubricating systemSplash
Ignition systemTransistorized ignition
Fuel systemCarburetor
Fuel consumption370 g/kWh
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemRecoil or electric starter
PTO shaft rotationCounterclockwise (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 weight43.5 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
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)
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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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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