Honda Engines iGX340

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Honda Engines



The iGX340 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.

Common Applications
  • Pressure washers
  • Forestry equipment
  • Generators
  • Construction / industrial equipment
  • Agricultural equipment
  • Water pumps
Advanced Technology
  • Integrated ECU (electronic control unit) with a self-tuning regulator (STR) governor system.
  • Engine senses and adjusts RPMs to match the application's load and speed requirements.
  • ECU enables drive-by-wire remote control operation of the engine and regulates functions such as throttle position.
Fuel Efficient Operation
  • Fuel economy is increased by approximately 15% over a similar conventional engine
  • Auto Throttle
High Power Output
  • Electronic governor minimizes governor droop, increasing available power
  • Allows the engine to respond significantly faster to the load
Smooth Performance
  • ECU fine tunes the throttle position to maintain a precise engine speed.
  • Precision engineered components result in lower vibration
Exceptionally Quiet
  • Improved muffler reduces overall engine noise by up to 4 dB(A).
  • Large capacity, multi-chamber exhaust system
  • Reduced mechanical noise due to higher compression and piston design
  • Forged steel crankshaft and rigid crankcase
Proven Reliability
  • Long-life air filter
  • Multifunction Oil Alert
Easy to Use and Maintain
  • No manual manipulation of the choke or throttle - Easier for inexperienced users to operate
  • Wide fuel filler mouth with ratchet-type fuel filler cap
  • Easy maintenance - ideal for rental applications
  • Easy access connectors for flexible connection of remote control and for ECU programming
  • Externally serviceable Oil Alert
Easy Starting
  • Auto Choke
  • Low effort recoil starter with automatic decompression
  • Camshaft profile is optimized for easy starting
  • Large diameter recoil starter assembly
  • Automotive-style ignition coil on spark plug
  • Digital CDI with higher spark plug voltage
Emissions Compliant
  • CARB and EPA certified
  • No catalyst necessary
Available Options
  • Spark arrester available
  • Charge and lamp coils with multiple output options available
  • Low profile versions available
  • Engine Type: Air-cooled 4-stroke OHV
  • Bore x Stroke: 88 X 64 mm
  • Displacement: 389 cm3
  • Net Power Output*: 10.7 HP (8 kW) @ 3,600 rpm
  • Net Torque: 19.5 lb-ft (26.4 Nm) @ 2,500 rpm
  • PTO Shaft Rotation: Counterclockwise (from PTO shaft side)
  • Compression Ratio: 8.2:1
  • Lamp/Charge coil options: 3A, 20A
  • Carburetor: Horizontal type butterfly valve
  • Ignition System: Digital CDI with variable timing
  • Starting System: Recoil/electric
  • Lubrication System: Splash
  • Governor System: Electric STR (Self Tuning)
  • Air cleaner: Dual element
  • Oil Capacity: 1.16 US qt (1.1 L)
  • Fuel Tank Capacity: 6.4 U.S. qts (6.1 liters)
  • Fuel: Unleaded 86 octane or higher
  • Dry Weight: 82 lb (37 kg)
  • Length (min): 16.0" (407mm)
  • Width (min): 19.1" (485 mm)
  • Height (min): 17.7" (449 mm)
PTO Shaft Options
  • E type: Tapered shaft
  • H type: Reduction type PTO
  • L type: Reduction type PTO
  • P type: Threaded type (SAE)
  • Q type: Straight shaft
  • R type: Reduction type PTO
  • V type: Tapered shaft
*The SAE J1349 standard measures net horsepower with the manufacturer's production muffler and air cleaner in place. Net horsepower more closely correlates with the power the operator will experience when using a Honda engine powered product. The power rating of the engines indicated in this document measures the net power output at 3600 rpm (7000 rpm for model GXH50, GXV50, GX25 and GX35) and net torque at 2500 rpm, as tested on a production engine. 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 operation speed of the engine in application, environmental conditions, maintenance and other variables.



Engine Type
Air-cooled 4-stroke OHV
Bore x Stroke
88 x 64 mm
389 cm3
Compression Ratio
10.7 hp (8 kW) @ 3,600 rpm
19.5 lb.-ft (26.4 Nm) @ 2,500 rpm
Fuel Capacity
6.4 U.S. qt. (6.1 L)
Starting System


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

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