Honda GS190

Honda GS190The Honda GS190 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, such as: pressure washers tillers and cultivators and other agricultural equipment, water pumps.

The Honda GS190 engine has a single-cylinder with a cast-iron cylinder liner, compact combustion chamber, tough resin overhead camshaft (OHC) for durability and quietness and uniblock construction reduce fuel consumption, ball bearing supported the crankshaft. The Honda GS190 engine has transistorized magneto ignition, horizontal type carburetor and recoil starter.

Cylinder bore and piston stroke is 69 mm (2.71 in) and 50.0 mm (2.0 in), respectively. Compression ratio rating is 8.5:1. It produces 3.9 kW (5.2 HP) at 3,600 rpm and 11.3 N·m (1.15 kg·m, 8.3 ft·lb) of torque at 2,500 rpm.

General information

Engine Specifications
Model GS190
Type 4-stroke, OHС, single cylinder
Displacement 187 cm 3 (11.4 cu-in)
Max. horsepower 5.2 HP (3.9 kW) at 3,600 rpm
Max. torque (crank PTO) 11.3 N·m (1.15 kg·m, 8.3 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 1.8 l (1.9 US. qts)
Fuel consumption 230 g/HPh
PTO shaft rotation Counterclockwise (from PTO shaft side)

Dimensions and Weight

GS190 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 0.58 l (0.61 US.qt.)
Ignition system
Spark plug NGK: BPR6ES
Spark plug gap 0.7-0.8 mm (0.028-0.031 in)
Author: Sergei Wers
About: 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.

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