Powerful. Reliable. Durable.

With the GX240 and 270, you’re looking at some of the best engines in the business. Powerful, Reliable, Durable, and Quiet. Honda’s GX Series is power you can trust, and then some.

Common Applications
  • Pressure washers
  • Commercial lawn and garden equipment
  • Tillers / cultivators
  • Generators
  • Construction / industrial equipment
  • Agricultural equipment
  • Small vehicles
  • Water pumps


Fuel Efficient, High Output Operation
  • Digital CDI ignition system with variable timing Learn More
  • Increased compression ratio
  • Precision camshaft design offers precise valve timing and optimal valve overlap for better fuel efficency
  • OHV design for increased efficiency and optimal power transfer
Smooth Performance
  • Precision engineered components result in lower vibration
  • Ball bearing supported crankshaft for greater stability
  • Heavy duty balancer shaft
  • Improved piston design
Exceptionally Quiet
  • Large capacity, multi-chamber exhaust system
  • Improved camshaft and muffler reduce overall engine noise by up to 5 dB
  • Reduced mechanical noise due to piston design
  • 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
  • Simple throttle control
  • Large fuel tanks
  • Large automotive type fuel cap
  • Dual oil drains and fill
  • Easy, convenient, heavy duty control box
  • Easily accessible spark plug
Easy Starting
  • Heavy duty recoil starter
  • Automatic mechanical de-compression system Learn More
  • Variable ignition timing
Emissions Compliant
  • EPA certified
  • No catalyst necessary
Available Options
  • Low profile versions
  • Gear reduction options
  • Electric start
  • Spark arrester available
  • Charge and lamp coils with multiple output options available
  • Cyclone Air Cleaner available (Select models)




Engine Type Air-cooled 4-stroke OHV Air-cooled 4-stroke OHV
Bore x Stroke 77 X 58 mm 77 X 58 mm
Displacement 270 cm3 270 cm3
Net Power Output* 7.9 hp (5.9 kW) @ 3,600 rpm 8.4 hp (6.3 kW) @ 3,600 rpm
Net Torque 13.4 lb-ft (18.3 Nm) @ 2,500 rpm 14.1 lb-ft (19.1 Nm) @ 2,500 rpm
PTO Shaft Rotation Counterclockwise (from PTO shaft side) Counterclockwise (from PTO shaft side)
Compression Ratio 8.5:1 8.5:1
Lamp/Charge coil options 25W, 50W / 1A, 3A, 7A 25W, 50W / 1A, 3A, 10A, 17A
Carburetor Butterfly Float Type Butterfly Float Type
Ignition System Digital CDI with variable ignition timing Digital CDI with variable ignition timing
Starting System Recoil/electric Recoil/electric
Lubrication System Splash Splash
Governor System Centrifugal Mass Type Centrifugal Mass Type
Air Cleaner Dual element Dual element
Oil Capacity 1.16 US qt (1.1 L) 1.16 US qt (1.1 L)
Fuel Tank Capacity 5.6 U.S. qts (5.3 liters) 5.6 U.S. qts (5.3 liters)
Fuel Unleaded 86 octane or higher Unleaded 86 octane or higher
Dry Weight 55.1 to 66.1 lb (25 to 30 kg) 55 lb (25 kg)
WARNING: California Prop 65 Info




Length (min) 15.0" (380 mm) 15.0" (380 mm)
Width (min) 16.9" (429 mm) 16.9" (429 mm)
Height (min) 16.6" (422 mm) 16.6" (422 mm)




E type Tapered shaft View Details Tapered shaft View Details
H type Reduction type PTO View Details Reduction type PTO View Details
L type Reduction type PTO View Details Reduction type PTO View Details
P type Threaded type (SAE) View Details Threaded type (SAE) View Details
Q type Straight shaft View Details Straight shaft View Details
R type Reduction type PTO View Details Reduction type PTO View Details
V type Tapered shaft View Details Tapered shaft View Details

Performance Curves

GX240 Performance Curve
GX270 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.