Torx TX390

Torx TX390 engineThe 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
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.

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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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