Honda iGX390 is a 389 cc (23.74 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.
An 88.0 mm (3.46 in) cylinder bore and 64.0 mm (2.52 in) piston stroke give the iGX390 engine a total of 389 cc of displacement. The compression ratio rating is 8.2:1.
The Honda iGX390 engine produced 11.8 PS (8.7 kW; 11.7 HP) at 3,600 rpm of net power and 26.5 N·m (2.7 kg·m, 19.5 ft·lb) at 2,500 rpm of peak torque.
The Honda iGX390 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 recoil and starter motor General information Engine Specifications Engine model iGX390 Engine type 4-stroke, OHV, single-cylinder Displacement 389 cm3 , (23.74 cu·in) Max. horsepower 11.8 PS (8.7 kW; 11.7 HP) at 3,600 rpm Max. torque 26.5 N·m (2.7 kg·m, 19.5 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 6.1 L (1.61 US. gal. 1.34 Imp. gal.) Fuel used Unleaded gasoline (octane number 86 or higher) Starting system Recoil or recoil and starter motor Stoping system Ignition primary circuit open Governor Self-tuning regulator (STR) governor system PTO shaft rotation Counterclockwise (from PTO shaft side) Dimensions (L x W X H) 380 x 484 x 448 mm (15.0 x 19.1 x 17.6 in) Dry weight 36.4 kg (80.2 lbs)
Cylinder Block and Head Cylinder block Compression ratio: 8.2:1 Cylinder bore: 88.0 mm (3.46 in) Piston stroke: 64.0 mm (2.52 in) Cylinder internal diameter (standard): 88.000-88.017 mm (3.4646-3.4652 in) Piston skirt outer diameter (standard): 87.975-87.985 mm (3.4636-3.464 in) Number of piston rings (compression / oil): 2/1 Connecting rod big end diameter (standard): 36.025-36.039 mm (1.4183-1.4189 in) Connecting rod small end diameter (standard): 20.005-20.020 mm (0.7876-0.7882 in) Piston pin diameter: 19.994-20.000 mm (0.7872-0.7874 in) Side clearance (Top): 0.015-0.060 mm (0.0006-0.0024 in) Side clearance (Second): 0.030-0.060 mm (0.0012-0.0024 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 end gap (Oil): 0.200-0.700 mm (0.0079-0.0276 in) Ring width (Top): 1.160-1.190 mm (0.0457-0.0469 in) Ring width (Second): 1.160-1.175 mm (0.0457-0.0463 in) Crankpin journal diameter: 35.975-35.985 mm (1.4163-1.4167 in) Crankshaft center distance: 32 mm (1.26 in) Cylinder head Valve arrangement: OHV, gear driven Valves: 2 Valve steam diameter (INTAKE): 6.575-6.590 mm (0.2589-0.2594 in) Valve steam diameter (EXHAUST): 6.535-6.550 mm (0.2573-0.2579 in) Valve spring free length (INTAKE): 39.0 mm (1.5354 in) Valve spring free length (EXHAUST): 39.0 mm (1.5354 in) Camshaft lobe height (INTAKE): 32.498-32.698 mm (1.2794-1.2873 in) Camshaft lobe height (EXHAUST): 31.985-32.185 mm (1.2592-1.2671 in) Camshaft journal diameter : 15.966-15.984 mm (0.6286-0.6293 in)
Tightening torque 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
Service Data Engine Maximum speed: 3,600±150 rpm Idle speed: 1,400±150 rpm Cylinder compression: 0.51-0.69 MPa (5.2-7.0 kgf/cm2 , 74-100 psi) / 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.) Ignition system Type: C.D.I.(Capacitor Discharge Ignition) Ignition timing: B.T.D.C. 10° / 1,400 rpm Spark plug: NGK: BPR6ES DENSO: W20EPR-USpark plug gap: 0.7-0.8 mm (0.0276-0.0315 in) Spark plug torque: 18 N·m (1.8 kg·m, 13.3 ft·lb) Ignition coil air gap 0.2-0.6 mm (0.0079-0.0236 in)
Applications 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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The Honda iGX390 is a 389 cc (23.74 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.
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