The 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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