GX120 4.0 HP OHV *

Standard Features

  • OHV design with steel cylinder liner, ball bearing supported crankshaft and float type carburetor
  • Automatic decompressor
  • Large muffler for quiet operation
  • Durable recoil starter
  • Oil drain / on two sides of the engine for different applications
  • Meets US EPA and CARB emission regulations


  • Various crankshaft PTO configurations to fit most applications



  • 3 year limited warranty

warranty image

SKU Price *PTOStarterAir CleanerOil AlertNotesDry Weight
GX120HX $1,025.00 3/4" dia.RecoilDual ElementYes6:1 Red15.9 kg / 35 lbs
GX120QX $686.00 3/4" dia.RecoilDual ElementYes13.2 kg / 29 lbs
GX120SHQ $773.00 18 mm dia.RecoilSemi-Dry13.2 kg / 29 lbs
GX120TX $811.00 5/8" dia. 18 UNFRecoilDual ElementYesThreaded13.2 kg / 29 lbs

† Common for Aerators
‡ Recommend keeping cyclone air filter when using to repower plate tamper

Engine Type Air-cooled, 4-Stroke, OHV, single cylinder
Bore x Stroke 60 x 42 mm (2.4 x 1.7 in)
Displacement 118 cm3 (7.2 cu in)
Compression Ratio 8.5 : 1
Net Horse Power Output* 2.6 kW (3.5 HP) at 3,600 rpm
Net Torque 7.3 Nm (5.4 lbs ft) at 2,500 rpm
PTO Shaft Rotation Counterclockwise (from PTO shaft side)
Ignition System Transistorized magneto ignition
Carburetor Horizontal type butterfly valve
Lubrication System Forced Splash
Governor System Centrifugal Mechanical
Oil Capacity 0.6 l (0.63 US qt, 0.53 Imp qt)
Fuel Tank Capacity 2.0 l (2.1 US qt)
Dimensions (L x W x H) 305 x 341 x 318 mm (12.0 x 13.4 x 12.5 in)

All prices subject to change without notice.
* The power rating of the engine indicated in this catalogue is the net power output tested on a production engine for the engine model and measured in accordance with SAE J1349 at 3600 rpm (7000 rpm for model GHX50, GXV50, GX25 and GX35). 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 operating speed of the engine in application, environmental conditions, maintenance and other variables.