Honda GC190

Honda GC190 engineThe Honda GC190 is a 187 cc, (11.41 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.

The Honda GC190 engine has a single-cylinder and overhead camshaft (OHC) with a timing belt. This engine used a horizontal type carburetor with a butterfly valve with a diaphragm type fuel pump, transistorized magneto ignition system, splash type lubricating system, and forced-air cooling system. The engine is fitted with a dry air cleaner. The GC190 is equipped with a 2.0 L (0.53 US. gal. 0.44 Imp. gal.) fuel tank.

The Honda GC190 engine produced 6.0 PS (4.4 kW; 6.0 HP) at 3,600 rpm of maximum output power and 12.1 N·m (1.2 kg·m, 8.9 ft·lb) at 2,500 rpm of peak torque.

General information

Engine Specifications
Engine model GC190
Engine type 4-stroke, OHC, single-cylinder
Displacement 187 cm3, (11.41 cu·in)
Max. horsepower 6.0 PS (4.4 kW; 6.0 HP) at 3,600 rpm
Max. torque 12.1 N·m (1.2 kg·m, 8.9 ft·lb) at 2,500 rpm
Cooling system Forced air
Air cleaner Dry (paper) type
Lubricating system Splash type
Ignition system Transistorized magneto ignition
Fuel system Horizontal type carburetor with butterfly valve
Fuel consumption 313 g/kWh
Fuel tank capacity 2.0 L (0.53 US. gal. 0.44 Imp. gal.)
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil starter
Stoping system Ignition primary circuit ground
Governor Centrifugal govervor
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) 345 x 369 x 331 mm (13.6 x 14.5 x 13 in)
Dry weight 13.2 kg (29.1 lbs)

Cylinder Block and Head

A 69.0 mm (2.72 in) cylinder bore and 50.0 mm (1.97 in) piston stroke give the GC190 engine a total of 187 cc of displacement. Compression ratio rating is 8.5:1.

Cylinder block
Compression ratio: 8.5:1
Cylinder bore: 69.0 mm (2.72 in)
Piston stroke: 50.0 mm (1.97 in)
Cylinder internal diameter (standard): 69.000 mm (2.7165 in)
Piston skirt outer diameter (standard): 68.985 mm (2.7159 in)
Number of piston rings (compression / oil): 2/1
Connecting rod big end diameter (standard): 30.020 mm (1.1819 in)
Connecting rod small end diameter (standard): 13.005 mm (0.512 in)
Piston pin diameter: 13.000 mm (0.5118 in)
Side clearance (Top): 0.035-0.065 mm (0.0014-0.0026 in)
Side clearance (Second): 0.035-0.065 mm (0.0014-0.0026 in)
Ring end gap (Top): 0.20-0.35 mm (0.0079-0.0138 in)
Ring end gap (Second): 0.30-0.45 mm (0.0118-0.0177 in)
Ring end gap (Oil): 0.15-0.35 mm (0.0059-0.0138 in)
Ring width (Top): 1.5 mm (0.0591 in)
Ring width (Second): 1.5 mm (0.0591 in)
Ring width (Oil): 2.5 mm (0.0984 in)
Crankshaft main journal diameter: PTO side: 27.993 mm (1.1021 in)
Flywheel side: 25.393 mm (0.9997 in)
Crankpin journal diameter: 29.980 mm (1.1803 in)
Crankshaft center distance: 25 mm (0.985 in)
Cylinder head
Valve arrangement: OHC, belt driven
Valves:: 2
Valve head diameter (INTAKE): 25.0 mm (0.9843 in)
Valve head diameter (EXHAUST): 24.0 mm (0.9449 in)
Valve steam diameter (INTAKE): 5.480 mm (0.2157 in)
Valve steam diameter (EXHAUST): 5.440 mm (0.2142 in)
Valve spring free length (INTAKE): 34.0 mm (1.3386 in)
Valve spring free length (EXHAUST): 34.0 mm (1.3386 in)
Camshaft lobe height (INTAKE): 37.394 mm (1.4722 in)
Camshaft lobe height (EXHAUST): 37.394 mm (1.4722 in)
Camshaft journal diameter : 9.987 mm (0.3932 in)

Tightening torque

Tightening torque settings
Connecting rod bolt: 12 Nm; 1.2 kg·m; 8.6 ft·lb
Valve adjusting lock nut: 8 Nm; 0.8 kg·m; 5.8 ft·lb
Cylinder head cover bolt: 12 Nm; 1.2 kg·m; 8.6 ft·lb
Oil drain plug bolt: 24 Nm; 2.4 kg·m; 17 ft·lb
Flywheel nut: 52 Nm; 5.3 kg·m; 38 ft·lb

Service Data

The Honda 4-stroke or an equivalent (SF or SG) oil with a viscosity of SAE 10W-30 is recommended for the GC190, refilling oil capacity is 0.58 L (0.61 US. qt, 0.51 Imp. qt.). Recommended spark plug is NGK: BPR6ES with 0.7-0.8 mm (0.0276-0.0315 in) spark plug gap.

The valve clearance is 0.11-0.19 mm (0.0043-0.0075 in) for intake valves and 0.16-0.24 mm (0.0063-0.0094 in) for exhaust valves. Standard cylinder compression is 5.0 kg/cm2 (71 psi) at 600 rpm.

Engine
Maximum speed: 3,850±150 rpm
Idle speed: 1,400 ±150 rpm
Cylinder compression: 5.0 kg/cm2 (71 psi) at 600 rpm
Valve clearance
Intake valve clearance: 0.11-0.19 mm (0.0043-0.0075 in)
Exhaust valve clearance: 0.16-0.24 mm (0.0063-0.0094 in)
Oil system
Lubrication system: Splash type
Oil type: Honda 4-stroke or an equivalent (SF or SG)
Recommended oil: SAE 10W-30
Oil capacity: 0.58 L (0.61 US. qt, 0.51 Imp. qt.)
Fuel system
Type: Horizontal type carburetor with butterfly valve
Main jet: #68
Float height: 9.2 mm (0.3622 in)
Pilot screw opening: 1-3/4 turns out
Ignition system
Type: Transistorized magneto ignition
Ignition timing: B.T.D.C. 20°
Spark plug: NGK: BPR6ES
Spark plug gap: 0.7-0.8 mm (0.0276-0.0315 in)
Spark plug torque: 20 N·m (2 kg·m, 14.7 ft·lb)
Ignition coil air gap 0.2-0.6 mm (0.008-0.024 in)

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