The 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 model | iGX440U |
| Engine type | 4-stroke, OHV, single-cylinder |
| Displacement | 438 cm3, (26.73 cu·in) |
| Max. horsepower | 15.2 PS (11.2 kW; 15.0 HP) at 3,600 rpm |
| Max. torque | 29.8 N·m (3 kg·m, 22 ft·lb) at 2,500 rpm |
| Cooling system | Forced air |
| Air cleaner | Dual-element type |
| Lubricating system | Forced splash |
| Ignition system | C.D.I.(Capacitor Discharge Ignition) |
| Fuel system | Horizontal type carburetor with butterfly valve |
| Fuel consumption | 3.5 Liters (0.92 US gal, 0.77 Imp gal) / h |
| 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 or electric starter |
| Stoping system | Ignition primary circuit ground |
| Governor | Self-tuning regulator (STR) governor system |
| PTO shaft rotation | Counterclockwise (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 weight | 39.0 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 |
| Valves: | 2 |
| 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 bolt | 14 Nm; 1.4 kg·m; 10 ft·lb |
| Cylinder head bolt | 35 Nm; 3.5 kg·m; 25 ft·lb |
| Flywheel nut | 165 Nm; 16.8 kg·m; 122 ft·lb |
| Bearing holder bolt | 26 Nm; 2.6 kg·m; 19 ft·lb |
| Crankcase cover bolt | 24 Nm; 2.4 kg·m; 17 ft·lb |
| Cam pulley bolt | 16 Nm; 1.6 kg·m; 12 ft·lb |
| Rocker arm shaft bolt | 23 Nm; 2.3 kg·m; 17 ft·lb |
| Starter motor nut | 8.8 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
| Engine | |
| 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) |
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