Honda G28

Honda G28 engineThe Honda G28 is a 67 cc (4.09 cu.in.) single-cylinder air-coolled 4-stroke internal combustion small gasoline engine manufactured by Honda Motor Company since 1969 for general-purpose applications.

The G28 has an overhead camshaft and an efficient combustion chamber designs together with a high-performance carburetor. 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 G28 engine compression ratio rating is 8.3:1, cylinder bore and piston stroke are 49.0 mm (1.93 in) and 35.5 mm (1.40 in), respectively.

The G28 produced 2.0 HP (1.49 kW) at 5000 rpm of continuous rated horsepower and from 2.8 HP (2.08 kW) to 3.0 HP (2.23 kW) at 6000 rpm of maximum horsepower.

General information

Engine Specifications
ModelG28
Type4-stroke, single cylinder
Displacement67 cm 3 (4.09 cu-in)
Max. horsepower2.8 HP (2.23 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 capacity2.6 L
PTO shaft rotationCounterclockwise (from PTO shaft side)

Maintenance data

Oil system
Oil typeHonda 4-stroke or an equivalent
Recommended oilSAE 10W-30 or 10W-40
Oil capacity0.7 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.

4 Comments

    • Check the oil level with the dipstick gauge on the oil filler cup:
      Upper limit-Lower lip of the oil filler opening.
      Lower limit-Ridge on the dipstick gauge.

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