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.
|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|
|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|
|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 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)|
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 capacity:||1.1 L (1.16 US. qt, 0.97 Imp. qt.)|