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Stationary Engine GX390


Stationary Engine GX390


As the largest single cylinder engine of Honda’s flagship GX range, the Stationary Engine 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.

For a full comparison of the Stationary Engine GX390 against other Honda engines, click on the Compare Products icon next to the Share tab, in the top right of this page.


A digital CDI ignition system with variable timing and an increased compression ratio combines with the GX390’s Precision Camshaft design to offer precise valve timing and optimal valve overlap for better fuel efficiency.

It draws on decades of Honda engineering with its OHV design, delivering increased efficiency and optimal power transfer where and when you need it.

The use of lightweight, noise-reducing materials and a forged steel crankshaft & rigid crankcase results in an exceptionally quiet engine – an improved piston design reduces mechanical noise, with an overall reduction of engine noise by up to 5 dB.


The Stationary Engine GX390 offers precision-engineered components resulting in lower vibration, and a Ball Bearing-supported Crankshaft for greater stability. It also offers an improved piston design and a heavy duty balancer shaft to deliver smooth performance.

Helical cut gears, a large capacity, multi-chamber exhaust system and sophisticated air intake system also makes for an exceptionally quiet engine.

And with Oil Alert, a simple Throttle Control, large Fuel Tank and Automotive Type Fuel Cap, Dual Oil Drains and Fills, an easily accessible Spark Plug and Heavy Duty Recoil Starter, the Stationary Engine GX390’s features go on and on.


Just like the entire GX Engine range, the GX390 is covered by an extensive Honda 3 Year Warranty.

And for those who want a little bit more, available extras include Gear reduction options, Electric start option, Spark arrester and Charge & Lamp Coils with Multiple Output Options. Low profile versions also available.

Engine Type

4-stroke, overhead valve, single-cylinder

Bore x Stroke (mm)

88 x 64

Displacement (cc)


Compression Ratio



Transistorized magneto

Charge Coil (Amps)

10, 1, Less than 1

Horsepower Class (hp)


Net Power (kw)

8.2 (11.0HP) at 3,600 rpm

Max Torque (Nm)

25.1 at 2,500 rpm

Shaft Vertical / Horizontal


Fuel Type


Fuel Tank Capacity (Ltrs)


Fuel Consumption (L/Hour)


Oil Capacity (Ltr)


Oil Alert System


Dimensions LxWxH (mm)

405 x 450 x 443

Dry Weight (kg)

35, 31, 33.5, 37.5


Agricultural Equipment, Commercial Lawn and Garden, Construction / Industrial Equipment, Forrestry Equipment, Generators, Pressure Washers, Small Vehicles, Tillers / Cultivators, Water Pumps

Stationary Engine GX390


The GX390 is the largest single cylinder engine of the GX Range and features power, performance, low fuel consumption, and low emissions into an all-round quality engine.

Clear selection