Honda GCV190

Honda GCV190The Honda GCV190 is a small (187 cc) single-cylinder air-cooled 4-stroke internal combustion gasoline engine with vertical shaft, manufactured by Honda Motor Company for general-purpose applications.

This engine has a single-cylinder, compact combustion chamber, tough resin overhead cam for durability and quietness and uniblock construction reduce fuel consumption. The Honda GCV190 engine has transistorized magneto ignition, horizontal type carburetor, and a recoil starter.

The cylinder bore and piston stroke is 69 mm (2.71 in) and 50.0 mm (2.0 in), respectively. The compression ratio rating is 8.5:1. It produces 3.8 kW (5.1 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 GCV190
Type 4-stroke, OHV, single cylinder
Displacement 187 cm 3 (11.4 cu-in)
Max. horsepower 5.1 HP (3.8 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 0.93 l (0.98 US.qt)
Fuel consumption 230 g/HPh
PTO shaft rotation Counterclockwise (from PTO shaft side)

Dimensions and Weight

GCV190
Length, mm (in) 367 (14.4)
Width, mm (in) 331 (13.0)
Height, mm (in) 349 (13.3)
Dry weight, kg (lb) 12.5 (27.6)

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: OHV
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
Air cleaner case bolt 10 Nm; 1.0 kg·m; 7 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 52 Nm; 5.3 kg·m; 38 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
Others
5 mm bolts, nuts 5.5 Nm; 0.55 kg·m; 4.0 ft·lb
6 mm bolts, nuts 10 Nm; 1.0 kg·m; 7 ft·lb
8 mm bolts, nuts 24 Nm; 2.4 kg·m; 17 ft·lb
10 mm bolts, nuts 37 Nm; 3.7 kg·m; 27 ft·lb
12 mm bolts, nuts 55 Nm; 5.5 kg·m; 39.5 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)
Spark plug tightening torque 20 Nm; 2.0 kg·m; 14 ft·lb
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
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10 Comments

  1. I have a Honda GCV 190 and the speed adjust control on the handle bar is no longer working correctly. I have to pull it all the way In order to speed up the auto propel. And even then it doesn’t go hardly any faster. It’s only two years old and originally, it was very sensitive and a huge help for the up and down in my yard. I can’t find anywhere online that shows how to adjust it. Any help? Thanks.

  2. I have a Honda lawn mower with a GCV-190 engine, which I need to replace. Can anyone tell me if the same model engine from a pressure washer will be a good replacement? I’m wondering if the mounting and the shop size will be the same on all engines with that model number

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