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 modelTX420
Engine type4-stroke, OHV, single-cylinder
Displacement420 cm3, (25.63 cu·in)
Max. horsepower15.0 PS (11.0 kW; 15.0 HP) at 3,600 rpm
Max. torque23.0 N·m (2.3 kg·m, 17 ft·lb) at 2,750 rpm
Cooling systemForced air
Lubricating systemSplash
Fuel systemCarburetor
Fuel tank capacity6.5 L (1.72 US. gal. 1.43 Imp. gal.)
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemRecoil starter
Stoping systemIgnition primary circuit ground
GovernorCentrifugal govervor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dry weight31.0 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

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
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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