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Honda GX390 11.7HP Horizontal Engine
- $278.00
- Brands Honda
- Product Code: GX390UT2QA2
- Availability: In Stock
Honda GX390 389cc 11.7 HP Gasoline Engine Product Overview The Honda GX390 11.7 HP Engine is a heavy-duty general-purpose gasoline engine designed for equipment that requires dependable power and strong torque. With a 389cc single-cylinder OHV configuration, the GX390 is well suited to demanding applications across construction, agriculture, landscaping, industrial, and utility work. Its proven..
Features of Honda GX390 11.7 HP OHV Engine
Honda GX390 389cc 11.7 HP Gasoline Engine
Product Overview
The Honda GX390 11.7 HP Engine is a heavy-duty general-purpose gasoline engine designed for equipment that requires dependable power and strong torque. With a 389cc single-cylinder OHV configuration, the GX390 is well suited to demanding applications across construction, agriculture, landscaping, industrial, and utility work.
Its proven 4-stroke design provides reliable operation without requiring a gasoline-and-oil fuel mixture, while the horizontal-shaft platform makes the engine adaptable to a wide range of compatible equipment.
Key Features
- 389cc displacement provides substantial power for demanding applications.
- 11.7 HP maximum power rating at the specified engine speed*.
- Single-cylinder OHV design promotes efficient combustion and durability.
- 4-stroke gasoline operation eliminates the need for premixed fuel.
- Air-cooled construction simplifies the cooling system.
- Horizontal-shaft configuration suits many pumps, generators, compactors, and utility machines.
- Designed for commercial and professional equipment.
- Straightforward maintenance helps support long-term service.
- Available in different configurations, including various starting and PTO options.
Product Specifications
| Specification | Details |
|---|---|
| Brand | Honda |
| Engine Series | GX Series |
| Model | GX390 |
| Product Type | General-Purpose Gasoline Engine |
| Displacement | 389cc |
| Cylinder | Single Cylinder |
| Engine Type | 4-Stroke |
| Valve Train | OHV |
| Cooling | Air-Cooled |
| Fuel | Unleaded Gasoline |
| Maximum Power | 11.7 HP at 3,600 rpm* |
| Rated Power | Approximately 10.2 HP at 3,600 rpm* |
| Shaft Configuration | Model-dependent |
| Shaft Orientation | Typically Horizontal |
| Starting System | Model-dependent |
| Application | Construction, agriculture, landscaping, industrial, and utility equipment |
*The 11.7 HP figure is a gross maximum power rating commonly associated with the GX390 under specified test conditions. It should not be confused with the engine's net/rated operating output.
389cc GX390 Performance
At 389cc, the GX390 is one of the larger single-cylinder engines in Honda's GX general-purpose lineup. Its displacement gives it the torque capacity needed to power equipment that may experience significant resistance or changing loads.
The engine is designed for applications where dependable power is more important than extremely compact size.
11.7 HP Maximum Power
The 11.7 HP maximum power rating represents the engine's gross maximum output under specified testing conditions. Actual usable power at the equipment's PTO can be lower because of factors such as operating conditions, accessories, drivetrain losses, and the specific engine configuration.
For equipment selection, it is therefore important to consider the manufacturer's rated/net power and torque requirements, rather than relying solely on the maximum horsepower figure.
OHV 4-Stroke Technology
The GX390 uses an overhead-valve (OHV) design engineered for efficient combustion and dependable operation. Its 4-stroke cycle uses a separate engine-oil lubrication system, so gasoline and engine oil do not normally need to be mixed.
This makes the engine practical for equipment that is operated frequently and requires predictable maintenance.
Air-Cooled Design
The engine uses forced-air cooling rather than a liquid radiator system. Cooling fins and airflow generated around the engine help dissipate heat during operation.
Keeping the cooling areas clean is important, particularly when the GX390 is used around dust, grass, soil, or construction debris.
Horizontal-Shaft Applications
Many GX390 configurations use a horizontal PTO shaft, allowing the engine to power machinery designed around this layout.
Common applications include:
- Water pumps
- Pressure washers
- Portable generators
- Plate compactors
- Tillers
- Construction equipment
- Agricultural machinery
- Landscaping equipment
- Industrial utility equipment
For replacement applications, verify the exact shaft diameter, shaft length, keyway, rotation, mounting pattern, and shaft height.
Maintenance
Regular maintenance helps preserve GX390 performance and service life. Typical service includes:
- Checking engine oil before operation
- Changing oil according to the recommended interval
- Cleaning or replacing the air filter
- Inspecting the spark plug
- Maintaining the fuel system
- Cleaning cooling fins and airflow passages
- Checking mounting hardware and PTO components
More frequent air-filter maintenance may be appropriate in dusty operating environments.
Common Applications
The Honda GX390 11.7 HP engine is suitable for:
- Construction machinery
- Agricultural equipment
- Commercial landscaping equipment
- Water pumps
- Pressure washers
- Generators
- Compactors
- Tillers
- Industrial machinery
- Specialty utility equipment
Why Choose the Honda GX390?
The Honda GX390 combines 389cc displacement, OHV technology, 4-stroke operation, air cooling, and substantial power output in a durable general-purpose engine platform.
The commonly advertised 11.7 HP maximum rating makes it an attractive choice for applications requiring significant power, while its established GX Series design provides a practical balance of performance, serviceability, and durability.
Important Product Note
Honda GX390 engines are available in multiple configurations, so specifications such as shaft dimensions, starting system, air cleaner, fuel tank, electrical equipment, and controls can vary.
For an accurate product listing or replacement-engine purchase, verify the complete GX390 model/type designation and match the engine's PTO, mounting, electrical, and control specifications to the equipment being powered.