Honda Engines GX120

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Honda Engines



Honda’s GX series engines are legendary for superior reliability and performance. And there’s no doubt about it: the GX120 lives up to the legend. Lower noise levels, lower vibration, and lower emissions – without sacrificing power output or performance.

Fuel Efficient, High Output Operation
  • Precision camshaft design offers precise valve timing and optimal valve overlap for better fuel efficiency
  • 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
Exceptionally Quiet
  • Even quieter than previous model!
  • 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
  • New carburetor chamber coating and carburetor filter help to protect against fuel impurities
  • 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
  • Ergonomic, easy to grip recoil rope design
  • Automatic mechanical de-compression system
Emissions Compliant
  • Lower emissions, same power output!
  • CARB and EPA certified
  • No catalyst necessary
Available Options
  • Gear reduction options
  • Spark arrester available
  • Engine Type: Air-cooled 4-stroke OHV
  • Bore x Stroke: 60 X 42 mm
  • Displacement: 118 cm3
  • Net Power Output*: 3.5 HP (2.6 kW) @ 3,600 rpm
  • Net Torque: 5.4 lb-ft (7.3 Nm) @ 2,500 rpm
  • PTO Shaft Rotation: Counterclockwise (from PTO shaft side)
  • Compression Ratio: 8.5:1
  • Lamp/Charge coil options: 25W, 50W
  • Carburetor: Butterfly
  • Ignition System: Transistorized magneto
  • Starting System: Recoil
  • Lubrication System: Splash
  • Governor System: Mechanical
  • Air cleaner: Dual Element
  • Oil Capacity: 0.59 US qt. (0.56 L)
  • Fuel Tank Capacity: 2.1 U.S. qts (2.0 liters)
  • Fuel: Unleaded 86 octane or higher
  • Dry Weight: 29 lbs. (13.0 kg)
  • Length (min): 11.7” (297 mm)
  • Width (min): 13.6” (346 mm)
  • Height (min): 13.0” (329 mm)
PTO Shaft Options
  • L type: Reduction type PTO
  • Q type: Straight shaft
  • S type: Straight shaft (metric)
  • T type: Straight shaft
  • AR type: Rammer
Common Applications
  • Commercial lawn and garden equipment
  • Tillers / cultivators
  • Generators
  • Construction / industrial equipment
  • Agricultural equipment
  • Water pumps
*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
60 X 42 mm
118 cm3
Compression Ratio
3.5 hp (2.6 kW) @ 3,600 rpm
5.4 lb-ft (7.3 Nm) @ 2,500 rpm
Fuel Capacity
2.1 qt. (2.0 L)
Starting System


11.7 in. (297 mm)
13.6 in. (346 mm)
13 in. (329 mm)
29 lb. (13 kg)

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