Honda Engines GX120 Series General Purpose Horizontal Shaft Reduction Engine 120 ccm, 2 3/64 x 3/4, 6 to 1 Reduction GX120UTIHX2

(No reviews yet) Write a Review
40.00 LBS
Calculated at Checkout
  • Honda GX120
  • Honda GX120- left side view
  • Honda GX120- rear view
  • Honda GX120- right side view
  • Honda GX120- operating Ventry ventillation fan
  • Honda GX120- GX series engines offer premium features and quality
  • Honda GX120- Precision camshaft design
  • Honda GX120- Superior air filtration systems
  • Honda GX120- Ball bearing supported crankshaft
  • Honda GX120- Dual oil drains and fill
  • Honda GX120- Automatic mechanical decompression for easier starting
  • Honda GX120- Billy Goat Core Aerator
  • Honda GX120- Mi-T-M 5 Gallon Air Compressor
  • Honda GX120- Stone Reversible Plate RP522


Completely redesigned for 2011, the new GX120 offers lower noise levels, lower vibration, and lower emissions – without sacrificing power output or performance. And the new GX120 essentially matches the dimensions of the previous model, so no modifications to existing equipment designs are necessary. 

Common Applications

  • Commercial lawn and garden equipment
  • Tillers / cultivators
  • Generators
  • Construction / industrial equipment
  • Agricultural equipment
  • Water pumps

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


  • 6 to 1 Reduction

Engine Type

Air-cooled 4-stroke OHV

Bore x Stroke

60 X 42 mm


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


Lamp/Charge coil options

25W, 50W



Ignition System

Transistorized magneto

Starting System


Lubrication System


Governor System


Air cleaner

Dual Element

Oil Capacity

0.59 US qt. (0.56 L)

Fuel Tank Capacity

2.1 U.S. qts (2.0 liters)


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


*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.


View AllClose

0 Reviews

View AllClose