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Stationary Engine GX120


Stationary Engine GX120


The Stationary Engine GX120 engine is frequently used by customers in commercial lawn and garden equipment.

It’s also used to power Construction/Industrial Equipment, as well as in Agricultural settings – including the powering of Water Pumps.

To accurately compare the GX120 with other Honda engines, click on the Compare Products icon next to the Share tab, in the top right of this page.


The GX120’s Precision Camshaft design offers 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 for where you need it.

And the Stationary Engine GX120 incorporates a high compression ratio for better fuel efficiency than its competitors.


A ball bearing-supported crankshaft and precision engineered components result in greater stability and lower vibration for you, no matter what the application.

The use of lightweight, noise-reducing materials and a forged steel crankshaft & rigid crankcase results in an exceptionally quiet engine that incorporates a large capacity, multi-chamber exhaust system.

And with a sophisticated air intake system, Oil Alert, Large fuel tank, Dual element air cleaner, Easily accessible spark plug and Cast Iron cylinder sleeve, the GX120 will work as hard as you with minimal fuss – day in, day out.


The GX120, just like the entire GX Engine range, is covered by an extensive Honda 3 Year Warranty.

That 3 years is relevant to both Domestic and Commercial applications, so you can rest assured with the knowledge that your GX120 is built to last.



GX120 Power Curve

* 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 3600 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.

Engine Type

4-stroke, overhead valve, single-cylinder

Bore x Stroke (mm)

60 x 42

Displacement (cc)


Compression Ratio


Starter Type

Recoil / Pull Start


Transistorized magneto

Horsepower Class (hp)


Net Power (kw)

2.6 (3.5HP) at 3600 rpm

Max Torque (Nm)

7.3 at 2500 rpm

Gearbox Reduction and Clutch

1:1, 2:1, 6:1

Shaft Size

18mm, 3/4″

Shaft Type


Shaft Vertical / Horizontal


Fuel Type


Fuel Tank Capacity (Ltrs)


Fuel Consumption (L/Hour)

1.0 at 3600 rpm

Oil Capacity (Ltr)


Oil Alert System


Dimensions LxWxH (mm)

305 x 341 x 318

Dry Weight (kg)

13.2, 14.2, 15.7

Charge Coil (Amps)

Less than 1


Agricultural Equipment, Commercial Lawn and Garden, Construction / Industrial Equipment, Generators, Tillers / Cultivators, Water Pumps

Stationary Engine GX120


Professionals rely on the GX120 to deliver reliable, easy starting, fuel efficient performance, day in and day out.

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