Honda GX140

Honda GX140 engineThe Honda GX140 is a 144 cc, (8.8 cu-in) single-cylinder air-cooled four-stroke internal combustion gasoline engine manufactured by Honda Motor Company since 1983 for general-purpose applications, such as pressure washers, commercial lawn and garden equipment, tillers and cultivators, generators, construction or industrial equipment, agricultural equipment, small vehicles, water pumps.

The Honda GX140 engine has a single cylinder inclined by 25°, an overhead valve (OHV) design for increased efficiency and optimal power transfer, a sophisticated air intake system, large capacity, a multi-chamber exhaust system, and a heavy-duty recoil starter. This engine used a horizontal type carburetor with butterfly valve, transistorized magneto ignition system, splash type lubricating system, and forced-air cooling system. The engine used a dual element (dry/semidry) air cleaner.

The GX140 engine produces 3.6 kW (5.0 PS) at 4,000 rpm of maximum output power and 9.8 N·m (1.0 kg·m, 7.7 ft·lb) at 2,800 rpm of peak torque.

General information

Engine Specifications
Engine modelGX140
Type4-stroke, OHV, single cylinder, inclined by 25°
Displacement144 cm 3 (8.78 cu-in)
Max. horsepower5.0 PS (3.6 kW) at 4,000 rpm
Max. torque9.8 N·m (1.0 kg·m, 7.7 ft·lb) at 2,800 rpm
CarburetorHorizontal type, butterfly valve
Cooling systemForced-air
Ignition systemTransistorized magneto ignition
Lubricating systemSplash
Starting systemRecoil starter
Stoping systemIgnition primary circuit ground
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity3.6 l (0.95 US. Gal, 0.79 Imp. Gal.)
Fuel consumption230 g/HPh
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W X H)Type S: 315 x 355 x 335 mm (12.4 x 14.4 x 13.2 in)
Dry weight14.0 kg (30.9 lbs)

Cylinder Block and Head

The Honda GX140 has cast iron cylinder sleeve, ball bearing supported crankshaft, improved piston design, heavy duty balancer shaft. The cylinder bore is 64.0 mm (2.5 in) and the piston stroke is 45.0 mm (1.77 in). Compression ratio rating is 8.7:1.

Cylinder block
Compression ratio:8.7:1
Cylinder bore:64.0 mm (2.5 in)
Piston stroke:45.0 mm (1.77 in)
Sleeve internal diameter64.000-64.015 mm (2.5196-2.5197 in)
Piston skirt outer diameter63.965-63.985 mm (2.5183-2.5190 mm)
Number of piston rings (compression / oil):2 / 1
Ring side clearance (Top/second)0.015-0.045 (0.0006-0.0018)
Ring end gap (Top/second)0.20-0.40 mm (0.0079-0.0157 in)
Ring end gap (Oil)0.15-0.35 mm (0.006-0.0137 in)
Ring width (Top/second)1.5 mm (0.059 in)
Ring width (Oil)2.5 mm (0.98 in)
Piston pin outer diameter:17.994-18.000 mm (0.7084-0.7087in)
Crankshaft main journal diameter:30.0 mm (1.1811 in)
Cylinder Head
Warpage (limit)0.10 mm (0.004 in)
Valve Arrangement:OHV
Stem outer diameter (INTAKE):5.468-5.480 mm (0.2152-0.2157 in)
Stem outer diameter (EXHAUST):5.425-5.440 mm (0.2135-0.2141 in)
Cam height (INTAKE):27.70 mm (1.0905 in)
Cam height (EXHAUST):27.75 mm (1.0925 in)
Camshaft journal diameter:14.00 mm (0.5511 in)

Service Data

Maximum speed3,960 ± 100 rpm
Idle speed1400 ± 150 rpm
Cylinder compression6.0-8.5 kg/cm2 (85-151 psi) at 600 rpm
TypeHorizontal type, butterfly valve
Main jet#68
Float height13.7±1.5 mm (0.54±0.06 in)
Pilot screw opening1 turns out
Oil system
Lubricating systemSplash type
Oil typeHonda 4-stroke or an equivalent (SE or SF)
Recommended oilSAE 10W-30
Oil capacity0.6 L (0.63 US. qt, 0.53 Imp. qt.)
Ignition system
Ignition timingB.T.D.C. 25° / 1,400 rpm
TypeTransistorized magneto ignition
Spark plugNGK: BPR6ES
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
Ignition coil air gap0.2-0.6 mm (0.01-0.02 in)


Manufacturer or BrandModels
HondaEB2200X, EG1500X, EG2200X, EG2500X, EM1600X, EM1800X, EM2200X
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

ATTENTION! Dear visitors, this is an informational database of technical specifications, we are not a parts supplier or a marketplace.

We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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