The Honda G25 is a 59 cc (3.6 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Honda Motor Company since 1966 for general-purpose applications.
The Honda G25 engine has a single-cylinder, an efficient combustion chamber, and a heavy-duty recoil starter. This engine used a horizontal type carburetor with a butterfly valve, high-voltage ignition, splash type lubricating system, and forced-air cooling system. The G25 is equipped with a 2.0 L fuel tank.
The G25 engine produced 2.5 PS (1.86 kW; 2.5 HP) at 6,000 rpm of maximum horsepower and 1.8 PS (1.32 kW; 1.8 HP) at 5,000 rpm of continuous horsepower.
General information
| Engine Specifications | |
| Engine model | G25 |
| Engine type | 4-stroke, OHV, single-cylinder |
| Displacement | 59 cm3, (3.6 cu·in) |
| Max. horsepower | 2.5 PS (1.86 kW; 2.5 HP) at 6,000 rpm |
| Max. torque | – |
| Cooling system | Forced air |
| Lubricating system | Splash type |
| Ignition system | High-voltage ignition |
| Fuel system | Horizontal type carburetor with butterfly valve |
| Fuel tank capacity | 2.0 L (0.53 US. gal. 0.44 Imp. gal.) |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Starting system | Recoil starter |
| Stoping system | Ignition primary circuit ground |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 360 x 282 x 276 mm (14.2 x 11.1 x 10.9 in) |
| Dry weight | 13.8 kg (30.4 lbs) |
Cylinder Block and Head
Cylinder bore and piston stroke are 46.0 mm (1.81 in) and 35.6 mm (1.4 in), respectively. Compression ratio rating is 8.6:1. Friction components such as the cylinder sleeve and piston are made of high strength materials. The crankshaft is mounted on two ball bearings for reduced friction.
| Cylinder block | |
| Compression ratio: | 8.6:1 |
| Cylinder bore: | 46.0 mm (1.81 in) |
| Piston stroke: | 35.6 mm (1.4 in) |
| Number of piston rings (compression / oil): | 2 / 1 |
| Crankshaft center distance: | 17.8 mm (0.7 in) |
| Cylinder head | |
| Valves:: | 2 |
Service Data
| Oil system | |
| Lubrication system: | Splash type |
| Oil type: | SAE 10W-30 or 10W-40 |
| Recommended oil: | Honda 4-stroke or an equivalent |
| Oil capacity: | 0.74 L (0.78 US. qt, 0.65 Imp. qt.) |
| Fuel system | |
| Type: | Horizontal type carburetor with butterfly valve |
| Ignition system | |
| Type: | High-voltage ignition |
| Spark plug: | NGK: C-6HB |
| Spark plug gap: | 0.6-0.7 mm (0.0236-0.0276 in) |
Applications
| Manufacturer or Brand | Models |
| Generators | |
| Honda | E600 |
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