• GX390_LF_Main

Honda GX390 Engine – Horizontal Crankshaft

Quality and performance come standard.
The GX390 features more power, quieter performance, lower fuel consumption, and lower emissions than the previous version. With new features and better performance, the new GX engines establish themselves yet again as one of the best engines in the business.

Common Applications:

  • Pressure washers
  • Commercial lawn and garden equipment
  • Tillers/cultivators
  • Forestry equipment
  • Generators
  • Construction/industrial equipment
  • Agricultural equipment
  • Small vehicles
  • Water pumps


We'd be happy to help!

Make An Inquiry



Spec Sheet
Engine Type Air-cooled 4-stroke OHV
Bore x Stroke 88 mm x 64 mm
Displacement 389 cm3
Net Power Output* 11.7 HP (8.7 kW) @ 3,600 rpm
Net Torque 19.5 lb-ft (26.4 Nm) @ 2,500 rpm
PTO Shaft Rotation Counterclockwise (from PTO shaft side)
Compression Ratio 8.2:1
Fuel Tank Capacity 6.1 litres (6.4 U.S. qts)
Lamp/Charge coil options 25W, 50W / 1A, 3A, 10A, 18A
Carburetor Butterfly float type
Ignition System Digital CDI with variable ignition timing
Starting System Recoil/electric
Lubrication System Splash
Governor System Centrifugal mass type
Air Cleaner Dual element
Oil Capacity 1.1 litres (1.16 U.S. qts)
Fuel Unleaded 86 octane or higher
Dry Weight 31.5 kg (69 lbs)
Length (min) 407 mm (16.0″)
Width (min) 485 mm (19.1″)
Height (min) 449 mm (17.7″)

*The power rating of the engine indicated in this document is the net power output tested on a production engine for the engine model and measured in accordance with SAE J1349 at 3,600 rpm (net power) and at 2,500 rpm (max net torque). Mass production engines may vary from this value. Actual power output for the engine installed in the final machine will vary depending on numerous factors, including the operating speed of the engine in application, environmental conditions, maintenance, and other variables.