Zongshen GB270

Zongshen GB270The Zongshen GB270 is a 0.27 L (272 cc, 16.6 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 GB270 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 ZS GB270 is equipped with a 3.6 L (0.95 US. gal. 0.79 Imp. gal.) fuel tank.

The GB270 engine produced 7.9 PS (5.8 kW; 7.8 HP) at 3,600 rpm of maximum horsepower and 15.5 N·m (1.6 kg·m, 11.4 ft·lb) of maximum torque.

General information

Engine Specifications
Engine model GB270
Engine type 4-stroke, OHV, single-cylinder
Displacement 272 cm3, (16.60 cu·in)
Max. horsepower 7.9 PS (5.8 kW; 7.8 HP) at 3,600 rpm
Max. torque 15.5 N·m (1.6 kg·m, 11.4 ft·lb)
Cooling system Forced air
Lubricating system Splash
Ignition system Transistorized ignition
Fuel system Carburetor
Fuel consumption 375 g/kWh
Fuel tank capacity 3.6 L (0.95 US. gal. 0.79 Imp. gal.)
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil / electric starter
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dry weight 17.2 kg (37.9 lbs)

Cylinder Block and Head

Cylinder bore is 75.0 mm (2.95 in) and piston stroke is 61.5 mm (2.42 in).

Cylinder block
Compression ratio:
Cylinder bore: 75.0 mm (2.95 in)
Piston stroke: 61.5 mm (2.42 in)
Number of piston rings (compression / oil): 2/1
Number of main bearings: 2
Crankshaft center distance: 30.75 mm (1.21 in)
Cylinder head
Valve arrangement: OHV
Valves: 2

Service Data

The 4-stroke engine oil with a viscosity of SAE 10W-30 is recommended for the GB270, refilling oil capacity is 0.6 L (0.63 US. qt, 0.53 Imp. qt.).

Maximum speed: 3,600 rpm
Idle speed: 1,450±150 rpm
Oil system
Lubrication system: Splash
Oil type: 4-stroke engine oil
Recommended oil: SAE 10W-30
Oil capacity: 0.6 L (0.63 US. qt, 0.53 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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