The GX390 engine is suitable for a wide range of heavy-duty applications such as construction equipment, tillers, generators, welders, pumps and other industrial applications.

Engine features:

  • The OHV design enhances combustion efficiency
  • A variable ignition timing (digital CDI) results in high power output, reduced fuel consumption and excellent exhaust emissions performance.
  • Easy starting with an automatic decompression system and an easy-to-grip soft recoil starter handle
  • High quality materials and purpose-built components ensure reliable long-term use
  • Meets world's most stringent environmental legislation
  • Guaranteed low fuel and oil consumption
  • Reduced vibration and noise level

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Engine type 4-stroke single cylinder
OHV petrol engine
25° inclined cylinder
horizontal shaft
Cylinder sleeve type Cast iron sleeve
Bore x Stroke 88 x 64 mm
Displacement 389 cm³
Compression ratio 8.2 : 1
Net power 8.7 kW ( 11.7 HP ) / 3600 rpm
Cont. rated power 6.4 kW ( 8.6 HP ) / 3000 rpm
7.0 kW ( 9.4 HP ) / 3600 rpm
Max. net torque 26.5 Nm ( 2.7 kgfm ) / 2500 rpm
Ignition system Digital CDI with variable ignition timing
Starter Recoil (el. start optional)
Fuel tank capacity 6.1 Liter
Fuel cons. at cont. rated power 3.5 L/h - 3600 rpm
Engine oil capacity 1.1 Liter
Dimensions (L x W x H) 406 x 460 x 448 mm
Dry weight 31.7 kg
Power curve GX390

The power rating of this engine is the net power tested on a production engine for this engine model and measured in accordance with SAE J1349 at a specified rpm. 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.

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Dimensions GX390
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