Honda G25

Honda G25 engineThe Honda G25 is a 59 cc (3.6 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
Model G25
Type 4-stroke, single cylinder
Displacement 59 cm 3 (3.6 cu-in)
Max. horsepower 2.5 HP (1.83 kW) at 6000 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 L
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 l
Ignition system
Spark plug NGK: C-6HB
Spark plug gap 0.6-0.7 mm (0.024-0.028 in)
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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