The Honda GX390 Engine is a powerful, commercial-grade 13 HP gas engine engineered for demanding industrial and professional applications. Known for its legendary durability and performance, the GX390 delivers reliable power, smooth operation, and long service life—even in the toughest working conditions.
Built with Honda’s proven OHV design, the GX390 offers excellent fuel efficiency, reduced emissions, and easy starting. It’s a trusted choice for pressure washers, generators, pumps, construction equipment, and industrial machinery, making it an ideal solution for engine replacement or equipment upgrades.
When performance, reliability, and longevity matter, the Honda GX390 sets the standard.
Key Features & Benefits
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13 HP commercial-grade Honda GX390 engine
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Durable overhead valve (OHV) design
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Smooth, low-vibration operation
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Easy recoil starting (electric start options available)
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Excellent fuel efficiency
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Heavy-duty cast iron cylinder sleeve
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Designed for extended service life
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Proven performance in harsh environments
Common Applications
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Pressure washers
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Portable generators
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Water and trash pumps
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Plate compactors
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Concrete and construction equipment
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Agricultural and industrial machinery
Honda GX390 Engine Specifications
| Specification | Details |
|---|---|
| Engine Type | 4-Stroke, OHV, Single Cylinder |
| Horsepower | 13 HP |
| Displacement | 389 cc |
| Cooling System | Air-Cooled |
| Fuel Type | Gasoline |
| Starting System | Recoil Start (Electric Start Optional) |
| Shaft Options | Keyed, Tapered, or Threaded (varies by model) |
| Cylinder Sleeve | Cast Iron |
| Oil Capacity | 1.1 qt (approx.) |
| Fuel Tank Capacity | 1.7 gal (varies by configuration) |
| Rotation | Counter-Clockwise (from PTO shaft) |
| Applications | Commercial & Industrial Equipment |
Why Choose a Genuine Honda GX390 Engine?
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Built to Honda factory specifications
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Industry-leading reliability and performance
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Maintains equipment value and efficiency
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Widely supported with genuine Honda parts
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Trusted worldwide by professionals
