Honda iGX440

Honda iGX440The Honda iGX440 is a 438 cc (26.73 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Honda Motor Company for general-purpose applications.

A 88.0 mm (3.46 in) cylinder bore and 72.1 mm (2.84 in) piston stroke give the iGX440 engine a total of 438 cc of displacement. The compression ratio rating is 8.1:1.

This engine produced 15.2 PS (11.2 kW; 15.0 HP) at 3,600 rpm of horsepower and 29.8 N·m (3 kg·m, 22 ft·lb) at 2,500 rpm of torque.

The Honda iGX440 features:

  • OHV design
  • Cast iron cylinder sleeve
  • Ball bearing supported crankshaft
  • Heavy-duty balancer shaft
  • C.D.I.(Capacitor Discharge Ignition)
  • Horizontal type carburetor with butterfly valve
  • ECU (electronic control unit) with a self-tuning regulator (STR) governor system
  • Forced splash lubrication system
  • Forced air cooling system
  • Recoil or electric starter

General information

Engine Specifications
Engine modeliGX440U
Engine type4-stroke, OHV, single-cylinder
Displacement438 cm3, (26.73 cu·in)
Max. horsepower15.2 PS (11.2 kW; 15.0 HP) at 3,600 rpm
Max. torque29.8 N·m (3 kg·m, 22 ft·lb) at 2,500 rpm
Cooling systemForced air
Air cleanerDual-element type
Lubricating systemForced splash
Ignition systemC.D.I.(Capacitor Discharge Ignition)
Fuel systemHorizontal type carburetor with butterfly valve
Fuel consumption3.5 Liters (0.92 US gal, 0.77 Imp gal) / h
Fuel tank capacity6.5 L (1.72 US. gal. 1.43 Imp. gal.)
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemRecoil or electric starter
Stoping systemIgnition primary circuit ground
GovernorSelf-tuning regulator (STR) governor system
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W X H)433 x 505 x 454 mm (17.0 x 19.9 x 17.9 in)
Dry weight39.0 kg (86.0 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:8.1:1
Cylinder bore:88.0 mm (3.46 in)
Piston stroke:72.1 mm (2.84 in)
Cylinder internal diameter (standard):88.000-88.017 mm (3.4646-3.4652 in)
Piston skirt outer diameter (standard):87.985-87.965 mm (3.464-3.4632 in)
Number of piston rings (compression / oil):2/1
Connecting rod big end diameter (standard):40.039-40.025 mm (1.5763-1.5758 in)
Connecting rod small end diameter (standard):20.994-21.000 mm (0.8265-0.8268 in)
Piston pin diameter:20.994-21.000 mm (0.8265-0.8268 in)
Side clearance (Top):0.030-0.050 mm (0.0012-0.002 in)
Side clearance (Second):0.030-0.050 mm (0.0012-0.002 in)
Ring end gap (Top):0.200-0.350 mm (0.0079-0.0138 in)
Ring end gap (Second):0.350-0.500 mm (0.0138-0.0197 in)
Ring width (Top):1.475-1.490 mm (0.0581-0.0587 in)
Ring width (Second):1.475-1.490 mm (0.0581-0.0587 in)
Crankpin journal diameter:39.975-39.985 mm (1.5738-1.5742 in)
Cylinder head
Valve arrangement:OHV, gear driven
Valve steam diameter (INTAKE):5.478-5.490 mm (0.2157-0.2161 in)
Valve steam diameter (EXHAUST):5.435-5.450 mm (0.214-0.2146 in)
Valve spring free length (INTAKE):46.3 mm (1.8228 in)
Valve spring free length (EXHAUST):46.3 mm (1.8228 in)
Camshaft lobe height (INTAKE):30.736-31.136 mm (1.2101-1.2258 in)
Camshaft lobe height (EXHAUST):30.145-30.545 mm (1.1868-1.2026 in)
Camshaft journal diameter :21.470-21.500 mm (0.8453-0.8465 in)

Tightening torque specs

Tightening torque specs
Connecting rod bolt14 Nm; 1.4 kg·m; 10 ft·lb
Cylinder head bolt35 Nm; 3.5 kg·m; 25 ft·lb
Flywheel nut165 Nm; 16.8 kg·m; 122 ft·lb
Bearing holder bolt26 Nm; 2.6 kg·m; 19 ft·lb
Crankcase cover bolt24 Nm; 2.4 kg·m; 17 ft·lb
Cam pulley bolt16 Nm; 1.6 kg·m; 12 ft·lb
Rocker arm shaft bolt23 Nm; 2.3 kg·m; 17 ft·lb
Starter motor nut8.8 Nm; 0.9 kg·m; 6.5 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

Service Data

Maximum speed:3,600±150 rpm
Idle speed:1,400±150 rpm
Cylinder compression:4-7 kg/cm2 (57-100 psi, 0.39-0.68 MPa) at 600 rpm
Valve clearance
Intake valve clearance:0.15±0.02 mm (0.006±0.001 in)
Exhaust valve clearance:0.20±0.02 mm (0.008±0.001 in)
Oil system
Lubrication system:Forced splash
Oil type:Honda 4-stroke or an equivalent (SE or later)
Recommended oil:SAE 10W-30
Oil capacity:1.1 L (1.16 US. qt, 0.97 Imp. qt.)
Fuel system
Type:Horizontal type carburetor with butterfly valve
Main jet:#112
Float height:13.2 mm (0.5197 in)
Pilot screw opening:1-5/8 turns out
Ignition system
Type:C.D.I.(Capacitor Discharge Ignition)
Ignition timing: B.T.D.C. 10° / 1,400 rpm
B.T.D.C. 13° / 3,600 rpm
Spark plug:NGK: BKR7E-E DENSO: K22PR-UR
Spark plug gap:0.7-0.8 mm (0.0276-0.0315 in)
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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