Honda Engines GXR120

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Honda Engines



Quality and performance come standard.

GXR120 is uniquely developed as an ideal source of power for rammers – equipment used to compact soil or other granular material. With superb durability and reliability for these heavy-duty applications, the GXR120 is more than ready to meet the high demands required.

  • Developed Specifically For Rammer Applications - Designed to power 110-lb. to 175-lb. rammers at multiple altitudes with ease.
  • Developed Specifically For Rammer Applications - More power than the GX100, with a compact, lightweight engine footprint for additional versatility in frame mounting
  • Easy Starting - Automatic mechanical de-compression system
  • Easy Starting - Ergonomic, easy to grip recoil rope design
  • Easy Starting - Heavy duty recoil starter
  • Easy To Use And Maintain - Easily accessible spark plug
  • Easy To Use And Maintain - Simple throttle control
  • Emissions Compliant - CARB and EPA compliant
  • Emissions Compliant - No catalyst necessary
  • Exceptionally Quiet - Compact exhaust system is 22mm narrower than the GX100, yet quieter
  • Exceptionally Quiet - Forged steel crankshaft and rigid crankcase
  • Exceptionally Quiet - Maintenance-free, low-noise timing belt creates a smaller, lighter and quieter engine
  • Exceptionally Quiet - New design reduces operation noise by 1dB over the original GX100
  • Exceptionally Quiet - Reduced mechanical noise due to light weight, noise-reducing materials
  • Fuel Efficient, High Output Operation - OHC design developed specifically for increased efficiency
  • Fuel Efficient, High Output Operation - Optimal power transfer for better fuel efficiency
  • Proven Reliability - 3-Year Limited Warranty
  • Proven Reliability - A special cast-iron cylinder sleeve and a high carbon-steel, dual-ball bearing crankshaft provide improved engine strength for rammer applications.
  • Proven Reliability - High quality materials, fit, and finish
  • Proven Reliability - Innovative lubrication system with a dual-breather chamber optimizes engine lubricating performance in most rammer operating conditions
  • Proven Reliability - New carburetor chamber coating and carburetor filter help to protect against fuel impurities
  • Proven Reliability - Oil Alert
  • Proven Reliability - The recoil starter and fan cover are even more robust through the incorporation of steel in the design.
  • Smooth Performance - Ball bearing supported crankshaft for greater stability
  • Smooth Performance - Precision engineered components result in lower vibration
  • Air Cleaner System: Multiple options available
  • Bore x Stroke: 60 X 43 mm
  • Carburetor: Multiple options available
  • Compression Ratio: 8.5:1
  • Displacement: 121 cm3
  • Engine: Air-cooled 4-stroke OHC
  • Fuel Capacity: 2.1 U.S. qts (2.0 liters)
  • Fuel: Unleaded 86 octane or higher
  • Governor: (System) Mechanical
  • Lubrication: Forced spray system
  • Oil Capacity: 0.29 US qt. (0.28 L)
  • Starting System: Recoil
  • Torque: (Net) 5.5 lb-ft (7.5 Nm) @ 2,500 rpm
  • Ignition: Transistorized magneto
  • Dry Weight: 22.9 lbs. (10.4 kg)
  • Height: 11.4” (290 mm)
  • Length: 10.2” (259 mm)
  • Width: 11.5” (294 mm)
General Information
  • Coil: (Lamp/Clutch Options) 25W, 50W
  • Output: (Net Power) 3.6 HP (2.7 kW) @ 3,600 rpm
  • PTO Shaft: (Rotation) Counterclockwise (from PTO shaft side)



Engine Type
Air-cooled 4-stroke OHC
Bore x Stroke
60 X 43 mm
121 cm3
Compression Ratio
(Net) 5.5 lb-ft (7.5 Nm) @ 2,500 rpm
Fuel Capacity
2.1 U.S. qts (2.0 liters)
Starting System


10.2” (259 mm)
11.5” (294 mm)
11.4” (290 mm)
22.9 lbs. (10.4 kg)

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