Honda GX80

Honda GX80The Honda GX80 is a 79.7 cc, (4.88 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Honda Motor Company for general-purpose applications.

Cylinder bore is 46.0 mm (1.81 in) and piston stroke is 48.0 mm (1.89 in). The compression ratio rating is 9.0:1.

This engine produces 2.0 PS (1.5 kW; 2.0 HP) at 3,600 rpm of horsepower and 4.5 N·m (0.5 kg·m, 3.3 ft·lb) at 2,500 rpm of torque.

The Honda GX80 features:

  • OHC design
  • Transistorized magneto ignition system
  • Horizontal type carburetor with butterfly valve
  • Centrifugal governor
  • Splash lubrication system
  • Forced air cooling system
  • Recoil starter

General information

Engine Specifications
Engine model GX80
Engine type 4-stroke, OHC, single-cylinder
Displacement 79.7 cm3, (4.88 cu·in)
Max. horsepower 2.0 PS (1.5 kW; 2.0 HP) at 3,600 rpm
Max. torque 4.5 N·m (0.5 kg·m, 3.3 ft·lb) at 2,500 rpm
Cooling system Forced air
Air cleaner Dual type (foam and paper)
Lubricating system Splash
Ignition system Transistorized magneto ignition
Fuel system Horizontal type carburetor with butterfly valve
Fuel consumption 0.6 L/h at 3,600 rpm
Fuel tank capacity 1.5 L (0.4 US. gal. 0.33 Imp. gal.)
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil starter
Stoping system Ignition primary circuit ground
Governor Centrifugal governor
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) 275 x 342 x 323 mm (10.8 x 13.5 x 12.7 in)
Dry weight 11.1 kg (24.5 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio: 9.0:1
Cylinder bore: 46.0 mm (1.81 in)
Piston stroke: 48.0 mm (1.89 in)
Number of piston rings (compression / oil): 2/1
Cylinder head
Valve arrangement: OHC, belt driven
Valves: 2

Service Data

Valve clearance
Intake valve clearance (COLD): 0.10±0.02 mm (0.004±0.001 in)
Exhaust valve clearance (COLD): 0.15±0.02 mm (0.006±0.001 in)
Oil system
Lubrication system: Splash type
Oil type: SF or higher
Recommended oil: SAE 10W-30
Oil capacity: 0.36 L (0.38 US. qt, 0.32 Imp. qt.)
Ignition system
Type: Transistorized magneto ignition
Spark plug: NGK C4HSB
Spark plug gap: 0.7-0.8 mm (0.0276-0.0315 in)


Manufacturer or Brand Models
Honda EG1000N
Honda F300D
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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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