Honda iGX240

Honda iGX240The Honda iGX240 is a 0.27 l (270 cc, 16.5 cu·in) single-cylinder air-coolled 4-stroke internal combustion small gasoline (petrol) engine with horizontal shaft, manufactured by Honda Motor for general-purpose applications. The iGX240 is a modified version of the GX240 engine with STR (Self Tuning Regulator) governor, so it is suitable for applications that require features like Auto-Idle and Auto-Choke.

The iGX240 engine has variable ignition timing C.D.I.(Capacitor Discharge Ignition) type magneto ignition, horizontal type, butterfly valve carburetor, and recoil or electric starter motor. The iGX240 cylinder bore is 77.0 mm (3.0 in) and piston stroke is 58.0 mm (2.3 in), compression ratio rating is 8.5:1.

The Honda iGX240 produces 7.9 HP (5.9 kW; 8.0 PS) at 3600 rpm of net power and 18.3 N·m (1.86 kgf·m, 13.4 lbf·ft) at 2500 rpm of net torque.

General information

Engine Specifications
ModeliGX240
Type4-stroke, OVH, single cylinder, inclined by 25°
Displacement270 cm 3 (16.5 cu·in)
Max. horsepower7.9 HP (5.9 kW; 8.0 PS) at 3,600 rpm
Max. torque18.3 N·m (1.86 kgf·m, 13.4 lbf·ft) at 2500 rpm
CarburetorHorizontal type, butterfly valve
Cooling systemForced-air
Ignition systemDigital C.D.I.(Capacitor Discharge Ignition) with variable ignition timing
Lubricating systemForced splash
Starting systemRecoil and Starter motor
Stoping systemIgnition exciter coil circuit open
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel consumption2.4 Liters (0.63 US gal, 0.53 Imp gal) / h
PTO shaft rotationCounterclockwise (from PTO shaft side)

Cylinder Block and Head

The Honda iGX240 has 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. The engine has integrated ECU (electronic control unit) with a self-tuning regulator (STR) governor system.

Cylinder block
Compression ratio:8.5:1
Bore x Stroke77 X 58 mm (3.0 x 2.3 in)
Sleeve internal diameter77.000 – 77.017 mm (3.0315 – 3.0322 in)
Piston skirt outer diameter76.975 – 76.985 mm (3.0305 – 3.0309 mm)
Number of piston rings (compression / oil):2 / 1
Ring side clearanceTop/second0.030 – 0.060 (0.0012 – 0.0024)
Ring end gapTop0.20 – 0.35 mm (0.0079 – 0.0138 in)
Second0.35 – 0.50 mm (0.0138 – 0.0197 in)
Oil (side rail)0.2 – 0.7 mm (0.01 – 0.03 in)
Ring widthTop1.160 – 1.175 mm (0.0457 – 0.0463 in)
Second1.160 – 1.175 mm (0.0457 – 0.0463 in)
Crankshaft outer diameter32.975 – 32.985 mm (1.2982 – 1.2986 in)
Cylinder Head
Warpage (limit)0.10 mm (0.004 in)
Valve Arrangement:OHV
Valves:2
Stem outer diameter (standard):INTAKE6.575 – 6.590 mm (0.2589 – 0.2594 in)
EXHAUST6.535 – 6.550 mm (0.2573 – 0.2579 in)
Cam height:INTAKE31.945 – 32.145 mm (1.2577 – 1.2655 in)
EXHAUST31.666 – 31.866 mm (1.2467 – 1.2546 in)
Camshaft outer diameter:15.966 – 15.984 mm (0.6286 – 0.6293 in)

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

Maintenance data

Engine
Maximum speed3,600 ± 150 rpm
Idle speed1,400 ± 150 rpm
Cylinder compression13.4 kg/cm2 (190 psi, 1.31 MPa) at 600 rpm
Valve clearance
Intake valve0.15 ± 0.02 (0.006 ± 0.001)
Exhaust valve0.20 ± 0.02 (0.008 ± 0.001)
Oil system
Oil typeHonda 4-stroke or an equivalent (SE or later)
Recommended oilSAE 10W-30
Oil capacity1.1 L (1.16 US gal, 0.97 lmp qt)
Ignition system
Ignition timingB.T.D.C. 10° / 1,400 rpm
Spark advancer performance10°-20°
Spark plugNGK: BPR6ES
DENSO: W20EPR-U
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
Ignition coil air gap0.2 – 0.6 mm (0.01 – 0.02 in)
Starter motor
Brush length10.0 mm (0.4 in)
Mica depth (limit)1.0 mm (0.04 in) limit: 0.2 (0.01)
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