The Torx TX390 is a 390 cc (23.80 cu-in) single-cylinder air-cooled 4-stroke internal combustion general-purpose gasoline engine with a horizontal PTO shaft.
The Torx TX390 engine has a single-cylinder with a horizontal shaft, an overhead valve (OHV) design, horizontal carburetor, and recoil starter.
Bore and stroke are 88.0 mm (3.46 in) and 64.0 mm (2.52 in), respectively. Compression ratio rating is 8.0:1.
The TX390 produced 13.0 PS (9.5 kW; 13.0 HP) at 3,600 rpm of maximum horsepower and 22.0 N·m (2.2 kg·m, 16.2 ft·lb) at 2,700 rpm of maximum torque.
General information
| Engine Specifications | |
| Model | TX390 |
| Type | 4-stroke, OHV, single cylinder |
| Displacement | 390 cm 3 (23.80 cu-in) |
| Max. horsepower | 13.0 PS (9.5 kW; 13.0 HP) at 3,600 rpm |
| Max. torque (crank PTO) | 22.0 N·m (2.2 kg·m, 16.2 ft·lb) at 2,700 rpm |
| Carburetor | Horizontal type |
| Cooling system | Forced-air |
| Ignition system | – |
| 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 | 6.5 L (1.72 US. gal. 1.43 Imp. gal.) |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Service Information
| Oil system | |
| Oil type | 4-stroke or an equivalent (SJ) |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 1.1 L (1.16 US. qt, 0.97 Imp. qt.) |
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