The Honda G25 is a 59 cc (3.6 cu.in.) single-cylinder, air-cooled, four-stroke cycle, internal combustion small gasoline engine manufactured by Honda Motor Company since 1966 for general-purpose applications.
The Honda G25 has a chain-driven overhead camshaft and an efficient combustion chamber. Friction components such as the cylinder sleeve and piston are made of high strength materials. The crankshaft is mounted on ball bearings for reduced friction.
The Honda G25 engine compression ratio rating is 8.6:1, cylinder bore and piston stroke are 46.0 mm (1.81 in) and 35.6 mm (1.40 in), respectively.
The G25 produced 1.8 PS (1.32 KW; 1.8 HP) at 5,000 rpm of continuous rated horsepower and 2.5 PS (1.83 KW; 2.5 HP) at 6,000 rpm of maximum horsepower.
General information
| Engine Specifications | |
| Model | G25 |
| Type | 4-stroke, single cylinder |
| Displacement | 59 cm 3 (3.6 cu-in) |
| Max. horsepower | 2.5 PS (1.83 KW; 2.5 HP) at 6,000 rpm |
| Max. torque | – |
| Carburetor | Horizontal, butterfly valve |
| Cooling system | Forced-air |
| Ignition system | High voltage ignition |
| Lubricating system | Splash system |
| Starting system | Recoil starter |
| Stoping system | Ground switch |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 2.0 liters (2.11 US.qts, 1.76 Imp. qts) |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
| Honda G25 | |
| Length, mm (in) | 360 (14.2) |
| Width, mm (in) | 282 (11.1) |
| Height, mm (in) | 276 (10.9) |
| Weight, kg (lb) | 13.8 (30.4) |
Maintenance data
| Oil system | |
| Oil type | Honda 4-stroke or an equivalent |
| Recommended oil | SAE 10W-30 or 10W-40 |
| Oil capacity | 0.74 liters (0.8 US.qts, 0.65 Imp. qts) |
| Ignition system | |
| Spark plug | NGK: C-6HB |
| Spark plug gap | 0.6-0.7 mm (0.024-0.028 in) |
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