Honda GX140

Honda GX140 engineThe Honda GX140 is a 0.14 l (144 cc) single-cylinder air-cooled 4-stroke internal combustion small gasoline engine manufactured by Honda Motor Company since 1983 for general-purpose applications.

This engine has a single cylinder inclined by 25° overhead valve design for increased efficiency and optimal power transfer, sophisticated air intake system, large capacity, multi-chamber exhaust system, heavy-duty recoil starter.

A 64.0 mm (2.5 in) cylinder bore and 45.0 mm (1.77 in) piston stroke give the engine a total of 144 cc of displacement. It produces 3.6 kW (5.0 PS) at 4,000 rpm and 9.8 N·m (1.0 kg·m, 7.7 ft·lb) of torque at 2,800 rpm.

General information

Engine Specifications
Model GX140
Type 4-stroke, OHV, single cylinder, inclined by 25°
Displacement 144 cm 3 (8.78 cu-in)
Max. horsepower 5.0 PS (3.6 kW) at 4000 rpm
Max. torque (crank PTO) 9.8 N·m (1.0 kg·m, 7.7 ft·lb) at 2800 rpm
Carburetor Horizontal type, butterfly valve
Cooling system Forced-air
Ignition system Transistorized magneto ignition
Lubricating system Splash
Starting system Recoil starter
Stoping system Ignition primary circuit ground
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity 3.6 l (0.95 US. Gal, 0.79 Imp. Gal.)
Fuel consumption 230 g/HPh
PTO shaft rotation Counterclockwise (from PTO shaft side)

Dimensions and Weight

GX140 “S-Type”
Length, mm (in) 315 (12.4)
Width, mm (in) 355 (14.4)
Height, mm (in) 335 (13.2)
Dry weight, kg (lb) 14.0 (30.9)

Cylinder Block and Head

The Honda GX140 has cast iron cylinder sleeve, ball bearing supported crankshaft, improved piston design, heavy-duty balancer shaft.

Cylinder block
Compression ratio: 8.7
Bore x Stroke 64 mm X 45 mm (2.5 x 1.77 in)
Sleeve internal diameter 64.00 mm (2.5196 in)
Piston skirt outer diameter 63.985 mm (2.5190 in)
Number of piston rings (compression / oil): 2 / 1
Cylinder Head
Warpage (limit) 0.10 mm (0.004 in)
Valve Arrangement: OHV
Valves: 2

Service Information

Maximum speed 4000 ± 150 rpm
Idle speed 1400 ± 150 rpm
Cylinder compression 6.0-8.5 kg/cm2 (85-151 psi) at 600 rpm
Oil system
Oil type Honda 4-stroke or an equivalent (SE or SF)
Recommended oil SAE 10W-30
Oil capacity 0.6 P (0.63 US. qt, 0.53 Imp. qt.)
Ignition system
Spark plug NGK: BPR6ES
Spark plug gap 0.7-0.8 mm (0.028-0.031 in)

Engine applications

  • Pressure washers
  • Commercial lawn and garden equipment
  • Tillers / cultivators
  • Generators
  • Construction / industrial equipment
  • Agricultural equipment
  • Small vehicles
  • Water pumps
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  1. I have an older Honda GX140 5 hp with a “roughly” 3/4″ 14 tooth splined shaft. I need to couple this engine with a hydraulic pump. Any help?

  2. I have a plate compactor with this engine. The engine has no compression, and I’d like to replace it with a new equivalent. Any suggestions for a direct-swap.
    Or can anyone tell me the output shiaft diameter so I can find an equivalent motor.

  3. @Kenny Millar – The output shaft diameter should be 3/4 inch. I believe the GX140 engine is still available. If you are on a tight budget, you might consider the Lifan LF160F-AQ. It is a Chinese Honda clone (a “Chonda”) and is rated 4hp, not 5hp, but it should bolt right up. Lifan engines are probably the best Chonda engines available. I know both Home Depot and Amazon sell them.

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