The Honda GC190 is an 187 cc (11.4 cu-in) single-cylinder, air-cooled, four-stroke internal combustion gasoline engine with horizontal 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 GC190 engine has horizontal type carburetor, recoil starter, and 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.
It produces 6.0 PS (4.4 KW; 6.0 HP) at 3,600 rpm and 12.1 Nm (1.3 kg·m; 8.3 lbf·ft) at 2,500 rpm of peak torque.
General information
| Engine Specifications | |
| Model | GC190 |
| Type | 4-stroke, OHC, single cylinder |
| Displacement | 187 cm 3 (11.4 cu-in) |
| Max. horsepower | 6.0 PS (4.4 KW; 6.0 HP) at 3,600 rpm |
| Max. torque (crank PTO) | 12.1 Nm (1.3 kg·m; 8.3 lbf·ft) 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 liters (2.1 US.qts, 1.8 Imp. qts) |
| Fuel consumption | 230 g/HPh |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
| Q | V | P | ||||||
| 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 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 | |
| Piston ring side clearance (Top): | 0.035-0.065 mm (0.0013-0.0026 in) | |
| Piston ring side clearance (Second): | 0.015-0.049 mm (0.0006-0.0019 in) | |
| Piston ring end gap (Top): | 0.200-0.350 mm (0.008-0.014 in) | |
| Piston ring end gap (Second): | 0.300-0.450 mm (0.012-0.018 in) | |
| Piston ring end gap (Oil): | 0.150-0.350 mm (0.006-0.014 in) | |
| Ring width (Top): | 1.5 mm (0.06 in) | |
| Ring width (Second): | 1.5 mm (0.06 in) | |
| Ring width (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 | |
| Valve stem outer diameter (INTAKE): | 5.480 mm (0.216 in) | |
| Valve stem outer diameter (EXHAUST): | 5.440 mm (0.214 in) | |
| Valve guide inner diameter (INTAKE): | 5.500 mm (0.2165 in) | |
| Valve guide inner diameter (EXHAUST): | 5.500 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 |
| Crankcase cover bolt | 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 | 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 |
| Fuel tank bolt, nut | 10 Nm; 1.0 kg·m; 7 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 mm (0.006 ± 0.002 in) |
| Exhaust valve | 0.20 ± 0.04 mm (0.008 ± 0.002 in) |
| Oil system | |
| Oil type | Honda 4-stroke or an equivalent (SE or SF) |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 0.58 liters (0.6 US.qts, 0.5 Imp. qts) |
| 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 Ω |
| 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:
My GC 190 is leaking oil- a lot of oil. It is on my log splitter and it’s very annoying.
I thought all Honda motors were quality engines. How do I fix this?
the oil leaks out of the crankcase through the governor shaft hole because Honda didnt machine the engine for a governor shaft seal, cheap shot from them! there is no fix for this! I actually bought the $3 seal and couldn”t install becauuse the hole isnt machined for it!
Honda engines are one of the best. Just not this model. This is pretty much their cheap throw away motor
I think you’d better contact a service center.
Hola adquirí un motor honda gc190..En mi trabajo siempre e trabajado con este motor me a salido muy bueno pero este nuevo que adquiri.viene muy sencillo. Lo que e checando de este motor no trae valeros en el eje del cigueñal no trae metales de viela y los viejito que tenemos traen todo eso e incluso la viela viene de otro material más duro quiero saber si ay alguna diferencia entre los dos en tiempo y resistencia ya que los viejito y el nuevo son el mismo número de parte
Disculpe la pregunta anterior fue un poco mal redactada… Solo quiero saber la diferencia entre mi motor viejito y el motor nuevo que adquirí honda gc 190 los dos son iguales en número solo la diferencia que uno es de valero en el eje del cigueñal y metales de viela y el nuevo que acabo de adquirir no trae valeros ni metales de viela quiero saber si los dos cuentan con la misma resistencia ya que el caballaje es el mismo
This isn’t a real Honda engine. Rather, a Chinese made generic engine with Honda decals. I have one in my PW and, it’s not all that great of an engine.
I have a Honda GC190 n a power washer. I have a horrible time starting the engine. Occasionaly I pull the pull cord once and it starts right up. Usually it is the opposite. I can barley pull the cord at all am and cant start it, period. The machine is not old, has only been used maybe 6 times. Ideas? Really ticked off.
You have to release water pressure from the machine.
I am replacing my rod assembly on a Honda GC190 engine. My problem is, when I tighten the rod assembly bolts to the crank shaft, the crank shaft will not turn. Either by hand or pull cord. When I loosen the bolts just a tad, it turn freely. What am I doing wrong? How do I tighten those bolts?
The conrod is more than likely for an undersize crank journal …. one that has been ground/refurbished
Runs for 10 to15 second with the choke on only 190 cc honda
see up top
Runs great, starts easy, no power, cleaned filter, drained fuel bowl, cleaned muffler, adjusted idle speed. No difference. Engine not old.
Great little motor so far! Really has good power for my tiller. Just put it on tonight.
Please, please…where is the fuel filter located on the GS190 6 HP Honda 4 cycle?? The owners manual says nothing of the fuel filter or “how to’ replace it.
Thanks, SD
There is a small gas filter in the gas tank remove and install a in line furl gilter uou are better off.