Quality and performance come standard.

Professionals rely on the GXV340 to deliver reliable, easy starting, fuel efficent performance, day in and day out.

Common Applications
  • Commercial lawn and garden equipment
  • Tractors
  • Construction / industrial equipment
  • Agricultural equipment
  • Small vehicles


Fuel Efficient, High Output Operation
  • Precision camshaft design offers precise valve timing and optimal valve overlap for better fuel efficency
  • OHV design for increased efficiency and optimal power transfer
  • High compression ratio for better fuel efficiency
Smooth Performance
  • Precision engineered components result in lower vibration
  • Ball bearing supported crankshaft for greater stability
  • Dual balancer shafts
Exceptionally Quiet
  • Large capacity, multi-chamber exhaust system
  • Reduced mechanical noise due to light weight, noise-reducing materials
  • Forged steel crankshaft and rigid crankcase
  • Helical cut gears
  • Sophisticated air intake system
Proven Reliability
  • Oil Alert Learn More
  • Cast iron cylinder sleeve
  • High quality materials, fit, and finish
  • Dual element air cleaner
  • Fuel Valve
  • 3-Year Limited Warranty
Easy to Use and Maintain
  • Large fuel tanks
  • Large automotive type fuel cap
  • Easy, convenient, heavy duty control box
  • Easily accessible spark plug
Easy Starting
  • Heavy duty recoil starter
  • Automatic mechanical de-compression system Learn More
Emissions Compliant
  • CARB and EPA certified
  • No catalyst necessary
Available Options
  • Gear reduction options
  • Electic start
  • Spark arrester available
  • Charge and lamp coils with multiple output options available




Engine Type Air-cooled 4-stroke OHV Air-cooled 4-stroke OHV
Bore x Stroke 82 X 64 mm 88 X 64 mm
Displacement 337 cm3 389 cm3
Net Power Output* 8.9 HP (6.6 kW) @ 3,600 rpm 10.2 HP (7.6 kW) @ 3,600 rpm
Net Torque 15.9 lb-ft (21.6 Nm) @ 2,500 rpm 17.8 lb-ft (24.2 Nm) @ 2,500 rpm
PTO Shaft Rotation Counterclockwise (from PTO shaft side) Counterclockwise (from PTO shaft side)
Compression Ratio 7.7:1 7.7:1
Lamp/Charge coil options 1A, 3A, 10A 3A / 1A, 3A, 10A
Carburetor Float Type Float Type
Ignition System Transistorized magneto Transistorized magneto
Starting System Recoil/electric Recoil/electric
Lubrication System Pressure and splash Pressure and splash
Governor System Centrifugal Mechanical Centrifugal Mechanical
Air Cleaner Dual element Dual element
Oil Capacity 1.2 US qt (1.1l) 1.2 US qt (1.1l)
Fuel Tank Capacity 2.2 US qts (2.1 liters) 2.2 US qts (2.1 liters)
Fuel Unleaded 86 octane or higher Unleaded 86 octane or higher
Dry Weight 71.2 lb (32.3 kg) 76.3 lb (33.3 kg)
WARNING: California Prop 65 Info




Length (min) 17.0" (433mm) 17.0" (433mm)
Width (min) 15.0" (382mm) 15.0" (382mm)
Height (min) 15.9" (406mm) 15.9" (406mm)




D type Straight shaft View Details Straight shaft View Details

Performance Curves

GXV340 Performance Curve
GXV390 Performance Curve

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.