Honda Engines iGX390

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Honda Engines



Taking intelligence to a whole new level.

The iGX390 is technologically advanced, offering you features and performance like no other small engine in the world. With its multi-function, high performance design combined with the same superior reliability of Honda's legendary GX engines, the iGX sets a new standard for engines.

  • Exceptionally Quiet - Improved camshaft and muffler to reduce overall engine noise by up to 5 dB(A).
  • Exceptionally Quiet - Large capacity, multi-chamber exhaust system
  • Exceptionally Quiet - Reduced mechanical noise due to higher compression and piston design
  • Fuel Efficient Operation - Auto Throttle
  • Fuel Efficient Operation - Fuel economy is increased by approximately 15% over a similar conventional engine
  • High Power Output - Allows the engine to respond significantly faster to the load
  • High Power Output - Electronic governor minimizes governor droop, increasing available power
  • Proven Reliability - Long-life air filter
  • Proven Reliability - Multifunction Oil Alert
  • Smooth Performance - ECU fine tunes the throttle position to maintain a precise engine speed.
  • Smooth Performance - Precision engineered components result in lower vibration
  • Advanced Technology - ECU enables drive-by-wire remote control operation of the engine and regulates functions such as throttle position.
  • Advanced Technology - Engine senses and adjusts RPMs to match the application's load and speed requirements.
  • Advanced Technology - Integrated ECU (electronic control unit) with a self-tuning regulator (STR) governor system.
  • Easy Starting - Auto Choke
  • Easy Starting - Automotive-style ignition coil on spark plug
  • Easy Starting - Camshaft profile is optimized for easy starting.
  • Easy Starting - Digital CDI with higher spark plug voltage
  • Easy Starting - Large diameter recoil starter assembly
  • Easy Starting - Low effort recoil starter with automatic decompression
  • Easy to Use and Maintain - Easy access connectors for flexible connection of remote control and for ECU programming
  • Easy to Use and Maintain - Easy maintenance - ideal for rental applications
  • Easy to Use and Maintain - Externally serviceable Oil Alert
  • Easy to Use and Maintain - No manual manipulation of the choke or throttle - Easier for inexperienced users to operate
  • Easy to Use and Maintain - Wide fuel filler mouth with ratchet-type fuel filler cap
  • Emissions Compliant - CARB and EPA certified
  • Emissions Compliant - No catalyst necessary
  • Exceptionally Quiet - Forged steel crankshaft and rigid crankcase
  • Fuel Capacity: 6.4 US qts (6.1 liters)
  • Fuel: Unleaded 86 octane or higher
  • Governor: Electric STR (Self Tuning)
  • Lubrication: Splash
  • Oil Capacity: 1.16 US qt (1.1 L)
  • Starting System: Recoil/electric
  • Torque: (Net) 19.5 lb-ft (26.4 Nm) @ 2,500 rpm
  • Air Cleaner System: Dual element
  • Bore x Stroke: 88 X 64 mm
  • Carburetor: Horizontal type butterfly valve
  • Compression Ratio: 8.2:1
  • Displacement: 389 cm3
  • Engine: Air-cooled 4-stroke OHV
  • Ignition: Digital CDI with variable ignition timing
  • Height: 17.7" (449 mm)
  • Length: 16.0" (407mm)
  • Width: 19.1" (485 mm)
  • Dry Weight: 82 lb (37 kg)
General Information
  • Output: (Net Power) 11.7 HP (8.7 kW) @ 3,600 rpm
  • PTO Shaft: (Rotation) Counterclockwise (from PTO shaft side)
  • Coil: (Lamp/Charge options) 3A, 20A



Engine Type
Air-cooled 4-stroke OHV
Bore x Stroke
88 X 64 mm
389 cm3
Compression Ratio
(Net) 19.5 lb-ft (26.4 Nm) @ 2,500 rpm
Fuel Capacity
6.4 US qts (6.1 liters)
Starting System


16.0" (407mm)
19.1" (485 mm)
17.7" (449 mm)
82 lb (37 kg)

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