Honda GS190A

Honda GS190AThe 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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