Description
Honda GX390 Engine – Maximum Power for Demanding Applications
Unmatched Power and Reliability
The Honda GX390 engine is the largest and most powerful in Honda’s GX series of commercial-grade engines. With 389cc of 4-stroke OHV performance, it’s built to handle the most demanding industrial and commercial applications. From concrete saws and generators to large pressure washers and construction equipment, the GX390 delivers the brute force and dependability professionals rely on every day.
Built to Perform in Tough Conditions
Engineered with a heavy-duty cast iron cylinder sleeve and high-quality internal components, the Honda GX390 engine is designed for long-lasting durability, even under continuous use. The OHV (Overhead Valve) design enhances combustion efficiency, resulting in better fuel economy and reduced emissions. Whether it’s running in hot, dusty, or rugged environments, this engine performs with consistent reliability.
Easy Starting and Operator Comfort
Honda’s advanced automatic decompression system makes starting the GX390 easy—even in cold weather. A smooth recoil or optional electric start system ensures quick and reliable ignition. The engine runs quietly and with low vibration, helping reduce fatigue during extended operation. These user-friendly features make the GX390 ideal for tough job site conditions.
Key Features of the Honda GX390 Engine
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389cc air-cooled 4-stroke OHV engine
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Recoil and electric start options
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Cast iron cylinder sleeve for extended life
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Dual-element air cleaner for superior filtration
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Low oil shutdown for engine protection
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EPA and CARB compliant for clean performance
Ideal Applications
The Honda GX390 engine powers a wide range of commercial equipment, including generators, large water pumps, pressure washers, concrete saws, and agricultural machinery. If your work demands serious power, durability, and efficiency, the GX390 is up to the task.
Additional Information
| Power (kW) | 8.7 |
|---|---|
| Speed (rpm) | 3600 |
| Torque (Nm) @ rpm | 26.4 @ 2500 |
| Displacement (cm3) | 389 |


