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Honda GX390 Engine


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This item: Honda GX390 Engine


As the largest of Honda’s flagship GX range of engines, the GX390 is used in all sorts of applications. From Pressure Washers and Construction/Industrial equipment, to Tillers/Cultivators, Generators and Commercial Lawn & Garden Equipment, it can be found working hard all over Australia.

Due to its power and emissions compliance, heavy-duty Forestry Equipment, Agricultural Equipment and Water Pumps are also powered by the gutsy GX390.

Key Features

  • Type: 4-stroke, overhead valve, single-cylinder, horizontal shaft
  • Bore & Stroke: 88 x 64mm
  • Displacement: 389 cm3
  • Compression Ratio: 8.2:1
  • Net Power: 8.7kW (11.7HP) at 3000rpm
  • Maximum Net Torque: 26.5Nm at 2500rpm
  • Ignition System: Transistorised magneto ignition
  • Starting System: Recoil (Electric starter optional)
  • PTO Shaft Rotation: Counter-clockwise (from PTO side)
  • Recommended Fuel: Unleaded
  • Lubrication System: Splash
  • Recommended Oil: 10W/30 API SG
  • Oil Capacity: 1.1L
  • Fuel Capacity: 6.1L


  • Dimensions: 405 x 450 x 433mm
  • Dry Weight: 31kg
  • Other: 2:1 Reduction