Winnipeg Honda Engines
Stephenson Equipment Projects

GX 120 (Horizontal Crankshaft)

Quality and performance come standard.
The GX120 offers lower noise levels, lower vibration, and lower emissions without sacrificing power output or performance. And the current GX120 essentially matches the dimensions of previous models, so no modifications to existing equipment designs are necessary.

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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

  • Large capacity, multi-chamber exhaust system
  • Reduced mechanical noise due to light weight, noise-reducing materials
  • Forged steel crankshaft and rigid crankcase
  • 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
  • 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 mm 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
Fuel Tank Capacity 2.0 litres (2.1 U.S. qts)
Lamp/Charge Coil Options 25W, 50W
Carburetor Horizontal type butterfly valve
Ignition System Transistorized magneto
Starting System Recoil
Lubrication System Splash
Governor System Centrifugal mechanical
Air Cleaner Dual element
Oil Capacity 0.56 litres (0.59 U.S. qts)
Fuel Unleaded 86 octane or higher
Dry Weight 13.0 kg (29 lbs.)



Length (min): 297 mm (11.7”)
Width (min): 346 mm (13.6”)
Height (min): 329 mm (13.0”)

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GX Series
GX 100 (Horizontal Crankshaft)
GX 120 (Horizontal Crankshaft)
GX 160 (Horizontal Crankshaft)
GX 200 (Horizontal Crankshaft)
GX 270 (Horizontal Crankshaft)
GX 340 (Vertical Crankshaft)
GX 390 (Vertical Crankshaft)
iGX 700 V-Twin
iGX 800 V-Twin

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