The Torx TX420 is a 0.4 L (420 cc, 25.63 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft. The TX420 engine is used motor pumps, lawn cutting equipment, shredders, high-pressure washer, hydraulic pumps, and drive units.
The Torx TX420 engine has a single-cylinder, overhead valve (OHV) design for increased efficiency, and recoil starter. This engine used a horizontal type carburetor, transistorized magneto ignition system, splash type lubricating system, and forced-air cooling system. The TX420 is equipped with a 6.5 L (1.72 US. gal. 1.43 Imp. gal.) fuel tank.
The Torx TX420 engine produced 15 PS (11.0 kW; 14.8 HP) at 3,600 rpm of maximum output power and 23.0 N·m (2.3 kg·m, 17 ft·lb) at 2,750 rpm of peak torque.
|Engine type||4-stroke, OHV, single-cylinder|
|Displacement||420 cm3, (25.63 cu·in)|
|Max. horsepower||15.0 PS (11.0 kW; 15.0 HP) at 3,600 rpm|
|Max. torque||23.0 N·m (2.3 kg·m, 17 ft·lb) at 2,750 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 a 90.0 mm (3.54 in) cylinder bore and 66.0 mm (2.6 in) piston stroke. Compression ratio rating is 8.4:1.
|Cylinder bore:||90.0 mm (3.54 in)|
|Piston stroke:||66.0 mm (2.6 in)|
|Number of piston rings (compression / oil):||2/1|
|Crankshaft center distance:||33 mm (1.3 in)|
The 4-stroke motor oil with a viscosity of 10W-30 is recommended for the TX420, 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.)|