The Torx TX390 is a 0.4 L (390 cc, 23.8 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft. The TX390 engine is used motor pumps, lawn cutting equipment, shredders, high-pressure washer, hydraulic pumps, and drive units.
The Torx TX390 engine has a single-cylinder, overhead valve (OHV) design for increased efficiency and optimal power transfer, and recoil starter. This engine used a horizontal type carburetor, transistorized magneto ignition system, splash type lubricating system and forced-air cooling system. The TX390 is equipped with a 6.5 L (1.72 US. gal. 1.43 Imp. gal.) fuel tank.
The Torx TX390 engine produced 12.9 PS (9.5 kW; 12.7 HP) at 3,600 rpm of maximum output power and 22.0 N·m (2.2 kg·m, 16.2 ft·lb) at 2,700 rpm of peak torque.
General information
| Engine Specifications | |
| Engine model | TX390 |
| Engine type | 4-stroke, OHV, single-cylinder |
| Displacement | 390 cm3, (23.8 cu·in) |
| Max. horsepower | 13.0 PS (9.5 kW; 13.0 HP) at 3,600 rpm |
| Max. torque | 22.0 N·m (2.2 kg·m, 16.2 ft·lb) at 2,700 rpm |
| Cooling system | Forced air |
| Lubricating system | Splash |
| Fuel system | Carburetor |
| Fuel tank capacity | 6.5 L (1.72 US. gal. 1.43 Imp. gal.) |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Starting system | Recoil starter |
| Stoping system | Ignition primary circuit ground |
| Governor | Centrifugal govervor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dry weight | 31.0 kg (68.3 lbs) |
Cylinder Block and Head
It has an 88.0 mm (3.46 in) cylinder bore and 64.0 mm (2.52 in) piston stroke. Compression ratio rating is 8.0:1.
| Cylinder block | |
| Compression ratio: | 8.0:1 |
| Cylinder bore: | 88.0 mm (3.46 in) |
| Piston stroke: | 64.0 mm (2.52 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Crankshaft center distance: | 32 mm (1.26 in) |
| Cylinder head | |
| Valve arrangement: | OHV |
| Valves:: | 2 |
Service Data
The 4-stroke motor oil with a viscosity of SAE 10W-30 is recommended for the TX390, refilling oil capacity is 1.1 L (1.16 US. qt, 0.97 Imp. qt.).
| Oil system | |
| Lubrication system: | Splash |
| Oil capacity: | 1.1 L (1.16 US. qt, 0.97 Imp. qt.) |
| Fuel system | |
| Type: | Carburetor |
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