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 modelGX80
Engine type4-stroke, OHC, single-cylinder
Displacement79.7 cm3, (4.88 cu·in)
Max. horsepower2.0 PS (1.5 kW; 2.0 HP) at 3,600 rpm
Max. torque4.5 N·m (0.5 kg·m, 3.3 ft·lb) at 2,500 rpm
Cooling systemForced air
Air cleanerDual type (foam and paper)
Lubricating systemSplash
Ignition systemTransistorized magneto ignition
Fuel systemHorizontal type carburetor with butterfly valve
Fuel consumption0.6 L/h at 3,600 rpm
Fuel tank capacity1.5 L (0.4 US. gal. 0.33 Imp. gal.)
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemRecoil starter
Stoping systemIgnition primary circuit ground
GovernorCentrifugal governor
PTO shaft rotationCounterclockwise (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 weight11.1 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

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 BrandModels
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.

ATTENTION! Dear visitors, this is an informational database of technical specifications, we are not a parts supplier or a marketplace.

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.

Be the first to comment

Leave a Reply

Your email address will not be published.