The Honda GS190A is a small 0.18 l (187 cc, 11.4 cu.in.) single-cylinder air-cooled 4-stroke internal combustion gasoline engine with horizontal shaft, manufactured by Honda Motor Company for general-purpose applications.
The Honda GS190A engine has a single-cylinder, compact combustion chamber, tough resin overhead cam for durability and quietness and uniblock construction to reduce fuel consumption. The Honda GS190A engine has transistorized magneto ignition, horizontal type carburetor, and recoil starter.
Cylinder bore and the piston stroke is 69 mm (2.71 in) and 50.0 mm (2.0 in), respectively. The compression ratio is 8.5:1. It produces 4.4 kW (6.0 HP) at 3,600 rpm and 12.1 N·m (1.23 kg·m, 8.9 ft·lb) of torque at 2,500 rpm.
General information
Engine Specifications
Model
GS190A
Type
4-stroke, OHС, single cylinder
Displacement
187 cm 3 (11.4 cu-in)
Max. horsepower
6.0 HP (4.4 kW) at 3,600 rpm
Max. torque (crank PTO)
12.1 N·m (1.23 kg·m, 8.9 ft·lb) at 2,500 rpm
Carburetor
Horizontal type, butterfly valve
Cooling system
Forced-air
Ignition system
Transistorized magneto ignition
Lubricating system
Splash
Starting system
Recoil starter
Stoping system
Ignition primary circuit ground
Fuel used
Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity
2.0 l (0.5 US.gal, 0.4 Imp. gal)
Fuel consumption
230 g/HPh
PTO shaft rotation
Counterclockwise (from PTO shaft side)
Dimensions and Weight
GS190A Type Q
Length, mm (in)
345 (13.6)
Width, mm (in)
369 (14.5)
Height, mm (in)
343 (13.5)
Dry weight, kg (lb)
13.8 (30.4)
Operating weight, kg (lb)
15.8 (34.8)
Cylinder Block and Head
Cylinder block
Compression ratio:
8.5:1
Bore x Stroke
69 mm X 50 mm (2.71 x 1.97 in)
Sleeve internal diameter
69.00 mm (2.7165 in)
Piston skirt outer diameter
68.985 mm (2.7159 in)
Number of piston rings (compression / oil):
2 / 1
Ring side clearance
Top
0.035-0.065 mm (0.0013-0.0026 in)
Second
0.015-0.049 mm (0.0006-0.0019 in)
Ring end gap
Top
0.20-0.35 mm (0.008-0.014 in)
Second
0.30-0.45 mm (0.012-0.018 in)
Oil
0.15-0.35 mm (0.006-0.014 in)
Ring width
Top/second
1.5 mm (0.06 in)
Oil
2.5 mm (0.10 in)
Connecting rod small end ID
13.005 mm (0.512 in)
Connecting rod big end ID
30.02 mm (1.1819 in)
Crankpin outer diameter
29.980 mm (1.1803 in)
Main journal outer diameter
PTO side
27.993 mm (1.1021 in)
Flywheel side
25.393 mm (0.9997 in)
Cylinder Head
Warpage (limit)
0.10 mm (0.004 in)
Valve Arrangement:
OHС
Valves:
2
Stem outer diameter (standard):
INTAKE
5.480 mm (0.216 in)
EXHAUST
5.44 mm (0.214 in)
Guide internal diameter
INTAKE / EXHAUST
5.5 mm (0.2165 in)
Spring free length
34.0 mm (1.34 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 Information
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
0.15 ± 0.04 (0.006 ± 0.002)
Exhaust valve
0.20 ± 0.04 (0.008 ± 0.002)
Oil system
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.)
Ignition system
Ignition timing
20° B.T.D.C.
Spark plug
NGK: BPR6ES
Spark plug gap
0.7-0.8 mm (0.028-0.031 in)
Primary ignition coil resistance
1.0-1.2 kΩ
Secondary ignition coil resistance
10.6-12.8 kΩ
Ignition coil air gap
0.2-0.6 mm (0.008-0.024 in)
Carburetor
Main jet
#68
Float height
9.2 mm (0.36 in)
Pilot screw opening
1-3/4 turns out
Author:Sergei WersAbout: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.
The Honda GS190A is a small 0.18 l (187 cc, 11.4 cu.in.) single-cylinder air-cooled 4-stroke internal combustion gasoline engine with horizontal shaft, manufactured by Honda Motor Company for general-purpose applications. 
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