Honda G25

Honda G25 engineThe Honda G25 is a 59 cc (3.6 cu.in.) single-cylinder air-coolled 4-stroke 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 HP (1.32 kW) at 5000 rpm of continuous rated horsepower and 2.5 HP (1.83 kW) at 6000 rpm of maximum horsepower.

General information

Engine Specifications
ModelG25
Type4-stroke, single cylinder
Displacement59 cm 3 (3.6 cu-in)
Max. horsepower2.5 HP (1.83 kW) at 6000 rpm
Max. torque
CarburetorHorizontal, butterfly valve
Cooling systemForced-air
Ignition systemHigh voltage ignition
Lubricating systemSplash system
Starting systemRecoil starter
Stoping systemGround switch
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity2.0 L
PTO shaft rotationCounterclockwise (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 typeHonda 4-stroke or an equivalent
Recommended oilSAE 10W-30 or 10W-40
Oil capacity0.74 l
Ignition system
Spark plugNGK: C-6HB
Spark plug gap0.6-0.7 mm (0.024-0.028 in)
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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

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