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.

Common Applications
  • Commercial Rammers
Developed Specifically for Rammer Applications
  • Designed to power 110-lb. to 175-lb. rammers at multiple altitudes with ease.
  • More power than the GX100, with a compact, lightweight engine footprint for additional versatility in frame mounting
Fuel Efficient, High Output Operation
  • OHC design developed specifically for increased efficiency
  • Optimal power transfer for better fuel efficiency
Smooth Performance
  • Precision engineered components result in lower vibration
  • Ball bearing supported crankshaft for greater stability
Exceptionally Quiet
  • New design reduces operation noise by 1dB over the original GX100
  • Compact exhaust system is 22mm narrower than the GX100, yet quieter
  • Maintenance-free, low-noise timing belt creates a smaller, lighter and quieter engine
  • Forged steel crankshaft and rigid crankcase
  • Reduced mechanical noise due to light weight, noise-reducing materials
Proven Reliability
  • The recoil starter and fan cover are even more robust through the incorporation of steel in the design.
  • A special cast-iron cylinder sleeve and a high carbon-steel, dual-ball bearing crankshaft provide improved engine strength for rammer applications.
  • Innovative lubrication system with a dual-breather chamber optimizes engine lubricating performance in most rammer operating conditions
  • New carburetor chamber coating and carburetor filter help to protect against fuel impurities
  • Oil Alert
  • High quality materials, fit, and finish
  • 3-Year Limited Warranty
Easy to Use and Maintain
  • Simple throttle control
  • Easily accessible spark plug
Easy Starting
  • Heavy duty recoil starter
  • Ergonomic, easy to grip recoil rope design
  • Automatic mechanical de-compression system
Emissions Compliant
  • CARB and EPA compliant
  • No catalyst necessary
  • Engine Type: Air-cooled 4-stroke OHC
  • Bore x Stroke: 60 X 43 mm
  • Displacement: 121 cm3
  • Net Power Output*: 3.6 HP (2.7 kW) @ 3,600 rpm
  • Net Torque: 5.5 lb-ft (7.5 Nm) @ 2,500 rpm
  • PTO Shaft Rotation: Counterclockwise (from PTO shaft side)
  • Compression Ratio: 8.5:1
  • Lamp/Charge coil options: Oil alert (LED not included)
  • Carburetor: Multiple options available
  • Ignition System: Transistorized magneto
  • Starting System: Recoil
  • Lubrication System: Forced spray system
  • Governor System: Mechanical
  • Air Cleaner: Multiple options available
  • Oil Capacity: 0.29 US qt. (0.28 L)
  • Fuel Tank Capacity: NA
  • Fuel: Unleaded 86 octane or higher
  • Dry Weight: 22.9 lbs. (10.4 kg)
  • Length (min): 10.2" (259 mm)
  • Width (min): 11.5" (294 mm)
  • Height (min): 11.4" (290 mm)
  • K type (tapered): Rammer
  • K type (straight): Straight shaft



Engine Type
Air-cooled 4-stroke OHC
Bore x Stroke
60 x 43 mm
121 cm3
Compression Ratio
3.6 hp (2.7 kW) @ 3,600 rpm
5.5 lb.-ft (7.5 Nm) @ 2,500 rpm
Fuel Capacity
Starting System


10.2 in. (259 mm)
11.5 in. (294 mm)
11.4 in. (290 mm)
22.9 lb.. (10.4 kg)

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