The 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 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 4,000 rpm |
| Max. torque | 9.8 N·m (1.0 kg·m, 7.7 ft·lb) at 2,800 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 (L x W X H) | Type S: 315 x 355 x 335 mm (12.4 x 14.4 x 13.2 in) |
| Dry weight | 14.0 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 diameter | 64.000-64.015 mm (2.5196-2.5197 in) |
| Piston skirt outer diameter | 63.965-63.985 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 |
| Valves: | 2 |
| 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
| Engine | |
| Maximum speed | 3,960 ± 100 rpm |
| Idle speed | 1400 ± 150 rpm |
| Cylinder compression | 6.0-8.5 kg/cm2 (85-151 psi) at 600 rpm |
| Carburetor | |
| Type | Horizontal type, butterfly valve |
| Main jet | #68 |
| Float height | 13.7±1.5 mm (0.54±0.06 in) |
| Pilot screw opening | 1 turns out |
| Oil system | |
| Lubricating system | Splash type |
| Oil type | Honda 4-stroke or an equivalent (SE or SF) |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 0.6 L (0.63 US. qt, 0.53 Imp. qt.) |
| Ignition system | |
| Ignition timing | B.T.D.C. 25° / 1,400 rpm |
| Type | Transistorized magneto ignition |
| Spark plug | NGK: BPR6ES NIPPONDENSO: W20EPR-U |
| Spark plug gap | 0.7-0.8 mm (0.028-0.031 in) |
| Ignition coil air gap | 0.2-0.6 mm (0.01-0.02 in) |
Applications
| Manufacturer or Brand | Models |
| Generators | |
| Honda | EB2200X, EG1500X, EG2200X, EG2500X |
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