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.
|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|
|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 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)|
|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.)|
|Type:||Horizontal type carburetor with butterfly valve|
|Spark plug:||NGK: C-6HB|
|Spark plug gap:||0.6-0.7 mm (0.0236-0.0276 in)|
|Manufacturer or Brand||Models|