The 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, OHC, 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:
OHC
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
10 Comments
I have a cgv190 motor it runs but it Serge’s how can I stop that..
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.
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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I have a cgv190 motor it runs but it Serge’s how can I stop that..
Release the flywheel brake lever to stop the engine.
Clean carburator jets
Carburetor needs cleaned
Thank for publishing all these specs just what I was looking for
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.
Check the drive belt.
Follow the cable down to the left side mower handle, there is an adjustment screw there about middle ways down the handle.
How can I get a GCV190 motor manual and parts list with part numbers?
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