The Honda GS190A is a 187 cc, (11.4 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 cylinder bore is 69.0 mm (2.72 in) and the piston stroke is 50.0 mm (1.97 in). The compression ratio rating is 8.5:1.
The Honda GS190A engine produced 6 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.
The Honda GS190A features:
- OHC design
- Transistorized magneto ignition system
- Horizontal type carburetor with butterfly valve
- Centrifugal governor
- Splash lubrication system
- Forced air cooling system
- Recoil starter
General information
| Engine Specifications | |
| Engine model | GS190A |
| Engine type | 4-stroke, OHV, 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 | – |
| Lubricating system | Splash |
| Ignition system | Transistorized magneto ignition |
| Fuel system | Horizontal type carburetor with butterfly valve |
| Fuel consumption | – |
| 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 governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 345 x 369 x 343 mm (13.6 x 14.5 x 13.5 in) |
| Dry weight | 13.8 kg (30.4 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 8.5:1 |
| Cylinder bore: | 69.0 mm (2.72 in) |
| Piston stroke: | 50.0 mm (1.97 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) |
| Side clearance (Top): | 0.035-0.065 mm (0.0014-0.0026 in) |
| Side clearance (Second): | 0.015-0.049 mm (0.0006-0.0019 in) |
| Ring end gap (Top): | 0.200-0.350 mm (0.0079-0.0138 in) |
| Ring end gap (Second): | 0.300-0.450 mm (0.0118-0.0177 in) |
| Ring end gap (Oil): | 0.150-0.350 mm (0.0059-0.0138 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: | 25.0 mm (0.985 in) |
| Cylinder head | |
| Valve arrangement: | OHC |
| Valves: | 2 |
| 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) |
Tightening torque specs
| Tightening torque specs | |
| Crankcase cover | 12 Nm; 1.2 kg·m; 8.6 ft·lb |
| 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 | 75 Nm; 7.6 kg·m; 55 ft·lb |
| Governor arm nut | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Muffler bolt | 12 Nm; 1.2 kg·m; 8.6 ft·lb |
| Recoil starter nut | 8.5 Nm; 0.85 kg·m; 6.1 ft·lb |
| Fan cover stud bolt | 12 Nm; 1.2 kg·m; 8.6 ft·lb |
| Spark plug | 20 Nm; 2.0 kg·m; 14 ft·lb |
Service Data
| 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 |
| Oil type: | Honda 4-stroke or an equivalent (SE or SF) |
| Recommended oil: | SAE 10W-30 |
| Oil capacity: | 0.55 L (0.58 US. qt, 0.48 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: | 20° B.T.D.C. |
| Spark plug: | NGK BPR6ES |
| Spark plug gap: | 0.7-0.8 mm (0.0276-0.0315 in) |
| Ignition coil air gap | 0.2-0.6 mm (0.0079-0.0236 in) |
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