The Honda GC190 is a tiny (187 cc) single-cylinder air-cooled 4-stroke internal burning gasoline engine with horizontal shaft, manufactured by Honda Motor firm for general-purpose applications.

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This engine has a single-cylinder, compact combustion chamber, tough resin overhead camer for durability and quietness and uniblock building reduce fuel consumption. The Honda GC190 engine has horizontal kind carburetor, recoil starter, and also transistorized magneto ignition.

A 69 mm (2.71 in) cylinder bore and 50 mm (1.97 in) piston stroke give the engine a total of 187 cc (11.4 cu-in) of displacement. The compression ratio is 8.5:1. The produces 4.4 kW (6.0 HP) at 3,600 rpm and 12.1 N·m (1.23 kg·m, 8.9 ft·lb) that torque at 2,500 rpm.

General information

Engine Specifications
Type4-stroke, OHV, single cylinder
Displacement187 cm 3 (11.4 cu-in)
Max. Horsepower6.0 HP (4.4 kW) in ~ 3,600 rpm
Max. Talk (crank PTO)12.1 N·m (1.23 kg·m, 8.9 ft·lb) in ~ 2,500 rpm
CarburetorHorizontal type, butterfly valve
Cooling systemForced-air
Ignition systemTransistorized magneto ignition
Lubricating systemSplash
Starting systemRecoil starter
Stoping systemIgnition primary circuit ground
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity2.0 l (0.53 US. Gal, 0.44 Imp. Gal.)
Fuel consumption230 g/HPh
PTO pillar rotationCounterclockwise (from PTO column side)

Dimensions and Weight

Length, mm (in)345 (13.6)355 (14.0)345 (13.6)
Width, mm (in)369 (14.5)
Height, mm (in)331 (13.0)
Dry weight, kg (lb)13.2 (29.1)
Operating weight, kg (lb)15.2 (33.51)

Cylinder Block and also Head

Cylinder block
Compression ratio:8.5:1
Bore x Stroke69 mm X 50 mm (2.71 x 1.97 in)
Sleeve interior diameter69.00 mm (2.7165 in)
Piston skirt external diameter68.985 mm (2.7159 in)
Number that piston rings (compression / oil):2 / 1
Ring side clearanceTop0.035-0.065 mm (0.0013-0.0026 in)
Second0.015-0.049 mm (0.0006-0.0019 in)
Ring finish gapTop0.20-0.35 mm (0.008-0.014 in)
Second0.30-0.45 mm (0.012-0.018 in)
Oil0.15-0.35 mm (0.006-0.014 in)
Ring widthTop/second1.5 mm (0.06 in)
Oil2.5 mm (0.10 in)
Connecting rod tiny end ID13.005 mm (0.512 in)
Connecting rod large end ID30.02 mm (1.1819 in)
Crankpin outer diameter29.980 mm (1.1803 in)
Main journal external diameterPTO side27.993 mm (1.1021 in)
Flywheel side25.393 mm (0.9997 in)
Cylinder Head
Warpage (limit)0.10 mm (0.004 in)
Valve Arrangement:OHV
Stem outer diameter (standard):INTAKE5.480 mm (0.216 in)
EXHAUST5.44 mm (0.214 in)
Guide inner diameterINTAKE / EXHAUST5.5 mm (0.2165 in)
Spring cost-free length34.0 mm (1.34 in)

Tightening speak specs

Tightening torque specs
Air cleaner instance bolt10 Nm; 1.0 kg·m; 7 ft·lb
Crankcase covering bolt12 Nm; 1.2 kg·m; 8.6 ft·lb
Connecting stick bolt12 Nm; 1.2 kg·m; 8.6 ft·lb
Valve adjusting lock nut8 Nm; 0.8 kg·m; 5.8 ft·lb
Cylinder head sheathe bolt12 Nm; 1.2 kg·m; 8.6 ft·lb
Oil drain plug bolt24 Nm; 2.4 kg·m; 17 ft·lb
Flywheel nut52 Nm; 5.3 kg·m; 38 ft·lb
Governor eight nut10 Nm; 1.0 kg·m; 7 ft·lb
Muffler bolt12 Nm; 1.2 kg·m; 8.6 ft·lb
Recoil starter nut8.5 Nm; 0.85 kg·m; 6.1 ft·lb
Fan cover stud bolt12 Nm; 1.2 kg·m; 8.6 ft·lb
Fuel tank bolt, nut10 Nm; 1.0 kg·m; 7 ft·lb
Spark plug20 Nm; 2.0 kg·m; 14 ft·lb
5 mm bolts, nuts5.5 Nm; 0.55 kg·m; 4.0 ft·lb
6 mm bolts, nuts10 Nm; 1.0 kg·m; 7 ft·lb
8 mm bolts, nuts24 Nm; 2.4 kg·m; 17 ft·lb
10 mm bolts, nuts37 Nm; 3.7 kg·m; 27 ft·lb
12 mm bolts, nuts55 Nm; 5.5 kg·m; 39.5 ft·lb

Service Information

Maximum speed3,850 ± 150 rpm
Idle speed1,400 ± 150 rpm
Cylinder compression5.0 kg/cm2 (71 psi) in ~ 600 rpm
Valve clearance
Intake valve0.15 ± 0.04 (0.006 ± 0.002)
Exhaust valve0.20 ± 0.04 (0.008 ± 0.002)
Oil system
Oil typeHonda 4-stroke or an tantamount (SE or SF)
Recommended oilSAE 10W-30
Oil capacity0.58 together (0.61 US. Qt, 0.55 Imp. Qt.)
Ignition system
Ignition timing20° B.T.D.C.
Spark plugNGK: BPR6ES
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
Spark plug tightening torque20 Nm; 2.0 kg·m; 14 ft·lb
Primary ignition coil resistance1.0-1.2 kΩ
Secondary ignition coil resistance10.6-12.8 kΩ
Ignition coil waiting gap0.2-0.6 mm (0.008-0.024 in)
Main jet#68
Float height9.2 mm (0.36 in)
Pilot screw opening1-3/4 transforms out

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We shot to use showed sources and also official documentation, however, differences in between sources or errors in entering details may occur.We execute not provide advice top top technical concerns related to the engines operation or repair. We do not introduce using listed information for engines repairing engines or spare components ordering, use only official company manuals and spare-parts catalogs.

Tony Litterio says:
May 5, 2018 at 6:30 pm
My GC 190 is leaking oil- a the majority of oil. It is ~ above my log splitter and also it’s really annoying.

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I thought all Honda electric motors were quality engines. How do I fix this?

Michael Franco
July 11, 2020 at 9:50 pm

I have a Honda GC190 n a strength washer. I have actually a dreadful time beginning the engine. Occasionaly ns pull the pull cord once and it starts appropriate up. Generally it is the opposite. I deserve to barley traction the cord at every am and cant start it, period. The an equipment is not old, has only been supplied maybe 6 times. Ideas? yes, really ticked off.

Steven Frost says:
July 29, 2020 at 3:35 pm

I am instead of my pole assembly top top a Honda GC190 engine. My difficulty is, as soon as I tighten the pole assembly bolts come the crank shaft, the crank tower will not turn. One of two people by hand or pull cord. As soon as I ease the bolts just a tad, it rotate freely. What am i doing wrong? exactly how do i tighten those bolts?