Torx TX420

Torx TX420 engineThe 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.

General information

Engine Specifications
Engine model TX420
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
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 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 block
Compression ratio: 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)
Cylinder head
Valve arrangement: OHV
Valves: 2

Service Data

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 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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