Honda GX240 K1/T1/UT1

Honda GX240 engineThe Honda GX240 K1/T1/UT1 is a 0.24 l (242 cc) single-cylinder air-cooled 4-stroke internal combustion small gasoline engine manufactured by Honda Motor Company for general-purpose applications.

This engine has an OHV design for increased efficiency and optimal power transfer; sophisticated air intake system; large capacity, multi-chamber exhaust system; heavy-duty recoil starter.

The Honda GX240 K1 produces 8.11 PS (8.0 HP, 6.0 kW) at 3600 rpm and 17 Nm (1.7 kg·m, 12 ft·lb) of torque at 2500 rpm.

The GX240 K1/T1/UT1 is an old version, nowadays Honda Motor Co. produces a new GX240 R2/RT2/T2/U2/UT2 engine with CDI ignition system.

PTO Shaft Options

  • E type – tapered shaft;
  • H type – 1/6 reduction type PTO;
  • L type – 1/2 reduction type PTO;
  • P type – threaded type (SAE);
  • Q type – straight shaft;
  • R type – 1/2 reduction type PTO with centrifugal clutch;
  • V type – tapered shaft;

General information

Engine Specifications
Model GX240K1
Type 4-stroke, OHV, single cylinder, inclined by 25°
Displacement 242 cm 3 (14.8 cu-in)
Max. horsepower 8.11 PS (8.0 HP, 6.0 kW) at 3600 rpm
Max. torque (crank PTO) 17 Nm (1.7 kg·m, 12 ft·lb) at 2500 rpm
Carburetor Horizontal type, butterfly valve
Cooling system Forced-air
Ignition system Transistorized magneto ignition
Lubricating system Splash
Starting system Recoil or electric starter
Stoping system Ignition primary circuit ground
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity 6.0 L (1.59 US gal, 1.32 lmp gal)
Fuel consumption 313 g/kWh (230 g/HPh, 0.51 lb/HPh)
PTO shaft rotation Counterclockwise (from PTO shaft side)

Dimensions and Weight

S Q L R H W P V
Length, mm (in) 355 (14.0) 380 (15.0) 405 (15.9) 440 (17.3) 425 (16.7) 370 (14.6) 380 (15.0) 400 (15.7)
Width, mm (in) 430 (16.9)
Height, mm (in) 410 (16.1)
Dry weight, kg (lb) 25 (55.1) 25 (55.1) 26.5 (58.4) 30 (66.1) 26.5 (58.4) 25 (55.1) 25 (55.1) 25 (55.1)
Operating
weight, kg (lb)
30 (66.1) 30 (66.1) 31.5 (69.4) 35 (77.2) 31.5 (69.4) 30 (66.1) 30 (66.1) 30 (66.1)

Cylinder Block and Head

The Honda GX240 engine has a cast iron cylinder sleeve, ball bearing supported crankshaft, improved piston design, heavy duty balancer shaft. The piston has two compression rings and one oil ring. Precision camshaft design offers precise valve timing and optimal valve overlap for better fuel efficiency.

Cylinder block
Compression ratio: 8.2
Bore x Stroke 73 X 58 mm (2.9 x 2.3 in)
Sleeve internal diameter 73.00 mm (2.874 in)
Piston skirt outer diameter 72.985 mm (2.8734 in)
Number of piston rings (compression / oil): 2 / 1
Ring side clearance Top/second/oil 0.015-0.045 mm (0.0006-0.0018 in)
Ring end gap Top/second 0.2-0.4 mm (0.01-0.02 in)
Oil 0.2-0.4 m (0.01-0.02 in)
Ring width Top/second 2.0 mm (0.08 in)
Oil 2.8 mm (0.110 in)
Crankshaft outer diameter 32.985 mm (1.2986 in)
Cylinder Head
Warpage (limit) 0.10 mm (0.004 in)
Valve Arrangement: OHV
Valves: 2
Stem outer diameter (standard): INTAKE 6.59 mm (0.259 in)
EXHAUST 6.55 mm (0.258 in)
Cam height: INTAKE 31.52-31.92 mm (1.241-1.257 in)
EXHAUST 31.56-31.96 mm (1.243-1.258 in)
Camshaft outer diameter: 15.984 mm (0.6293 in)

MAINTENANCE DATA

Engine
Maximum speed 3850 ± 150 rpm
Idle speed 1400 ± 150 rpm
Cylinder compression 6.0-8.5 kg/cm2 (85-151 psi) at 600 rpm
Valve clearance
Intake valve 0.15 ± 0.02 (0.006 ± 0.001)
Exhaust valve 0.20 ± 0.02 (0.008 ± 0.001)
Carburetor
Main jet Externally vented carburetor bowl: #85
Internally vented carburetor bowl: #92
Float height 13.2 mm (0.52 in)
Pilot screw opening 2
Oil system
Oil type Honda 4-stroke or an equivalent (SG.SF/CC.CD)
Recommended oil SAE 10W-30
Oil capacity 1.1 L (1.16 US qt, 0.97 lmp qt)
Ignition system
Ignition timing 20 ° B.T.D.C (Fixed)
Spark plug NGK: BP6ES, BPR6ES
NIPPONDENSO: W20EP-U, W20EPR-U
Spark plug gap 0.7-0.8 mm (0.028-0.031 in)
Spark plug cap 7.5-12.5 kΩ
Primary ignition coil resistance 0.8-1.0 kΩ
Secondary ignition coil resistance 5.9-7.1 kΩ
Ignition coil air gap 0.4 ± 0.2 (0.016 ± 0.008)

Tightening torque specs

Tightening torque specs
Connecting rod bolt (M8x1.25 Special) 14 Nm; 1.4 kg·m; 10 ft·lb
Cylinder head bolt (M10x1.25) 35 Nm; 3.5 kg·m; 25 ft·lb
Flywheel nut (M16x1.5 Special) 115 Nm; 11.5 kg·m; 83 ft·lb
Rocker arm pivot lock nut (M6x0.5) 10 Nm; 1.0 kg·m; 7 ft·lb
Rocker arm pivot bolt (M8x1.25 Special) 24 Nm; 2.4 kg·m; 17 ft·lb
Crankcase cover bolt (M8x1.25) 24 Nm; 2.4 kg·m; 17 ft·lb
Oil level switch joint nut (M10x1.25) 10 Nm; 1.0 kg·m; 7 ft·lb
Fuel filter joint nut (M10x1.25) 2 Nm; 0.2 kg·m; 1.4 ft·lb
Muffler mounting nut (M8x1.25) 24 Nm; 2.4 kg·m; 17 ft·lb
Air cleaner wing nut (M6x1.0) 9 Nm; 0.9 kg·m; 6.5 ft·lb
Oil drain bolt (M12x1.5) 23 Nm; 2.3 kg·m; 17 ft·lb
Fuel tank bolt (M8x1.25) 24 Nm; 2.4 kg·m; 17 ft·lb
Air cleaner mounting nut (M6x1.0) 10 Nm; 1.0 kg·m; 7 ft·lb
Fuel strainer cup (M24x1.0) 4 Nm; 0.4 kg·m; 2.9 ft·lb
Standard torque values
Bolt, nut (5 mm) 5.5 Nm; 0.55 kg·m; 4.0 ft·lb
Bolt, nut (6 mm) 10 Nm; 1.0 kg·m; 7 ft·lb
Bolt, nut (8 mm) 24 Nm; 2.4 kg·m; 17 ft·lb
Bolt, nut (10 mm) 37.5 Nm; 3.75 kg·m; 27 ft·lb
Bolt, nut (12 mm) 55 Nm; 5.5 kg·m; 40 ft·lb

Engine applications

  • Pressure washers
  • Commercial lawn and garden equipment
  • Tillers / cultivators
  • Generators
  • Construction / industrial equipment
  • Agricultural equipment
  • Small vehicles
  • Water pumps
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