Honda Engines GX100

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Honda Engines



Professionals rely on the GX100 to deliver reliable, easy starting, fuel efficent performance, day in and day out.

Common Applications
  • Commercial lawn and garden equipment
  • 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 efficency
  • OHC 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
  • Cast iron cylinder sleeve
  • High quality materials, fit, and finish
  • Fuel Valve
Easy to Use and Maintain
  • Large fuel tanks
  • Easily accessible spark plug
  • Large automotive type fuel cap
Easy Starting
  • Automatic mechanical de-compression system
  • Heavy duty recoil starter
Emissions Compliant
  • No catalyst necessary
  • CARB and EPA certified
Available Options
  • Spark arrester available
  • Engine Type: Air-cooled 4-stroke OHC
  • Bore x Stroke: 56 X 40 mm
  • Net Power Output*: 2.8 HP (2.1 kW) @ 3,600 rpm
  • Displacement: 98 cm3
  • Net Torque: 4.2 lb-ft (5.7 Nm) @ 3,600 rpm
  • PTO Shaft Rotation: Counterclockwise (from PTO shaft side)
  • Compression Ratio: 8.5:1
  • Carburetor: Float Type
  • Ignition System: Transistorized magneto
  • Starting System: Recoil
  • Lubrication System: Splash
  • Governor System: Centrifugal Mechanical
  • Air cleaner: Dual element
  • Oil Capacity: 0.42 US qt (0.40l)
  • Fuel Tank Capacity: 0.81 U.S. qt (0.77 liter)
  • Fuel: Unleaded 86 octane or higher
  • Dry Weight: 23.4 lb (10.6 kg)
  • Length (min): 11.6" (295mm)
  • Width (min): 12.0" (304mm)
  • Height (min): 15.8" (402mm)
PTO Shaft Options
  • K type: Rammer type
  • Q type: Straight shaft
  • V type: Tapered shaft
*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.



Engine Type
Air-cooled 4-stroke OHC
Bore x Stroke
56 x 40 mm
98 cm3
Compression Ratio
2.8 hp (2.1 kW) @ 3,600 rpm
4.2 lb.-ft (5.7 Nm) @ 3,600 rpm
Fuel Capacity
0.81 U.S. qt. (0.77 L)
Starting System


11.6 in. (295mm)
12.0 in. (304mm)
15.8 in. (402mm)
23.4 lb. (10.6 kg)

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