Honda G28

Honda G28 engineThe Honda G28 is a 67 cc, (4.1 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Honda Motor Company from 1969 for general-purpose applications.

The Honda G28 engine has an overhead camshaft and an efficient combustion chamber designs together with a high-performance carburetor. The G28 is equipped with a 2.6 L (0.69 US. gal. 0.57 Imp. gal.) fuel tank.

This engine produced 2.0 PS (1.49 kW; 2.0 HP) at 5,000 rpm of continuous rated output power and 3.0 PS (2.23 kW; 3.0 HP) at 6,000 rpm fo maximum power.

General information

Engine Specifications
Engine model G28
Engine type 4-stroke, single-cylinder
Displacement 67 cm3, (4.1 cu·in)
Max. horsepower 3.0 PS (2.23 kW; 3.0 HP) at 6,000 rpm
Max. torque
Cooling system Forced air
Lubricating system Splash type
Ignition system High-voltage ignition
Fuel system Horizontal type carburetor with butterfly valve
Fuel tank capacity 2.6 L (0.7 US. gal. 0.57 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)
Dry weight

Cylinder Block and Head

Cylinder bore and piston stroke are 49.0 mm (1.93 in) and 35.5 mm (1.4 in), respectively. The compression ratio rating is 8.3:1. 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.

Cylinder block
Compression ratio: 8.3:1
Cylinder bore: 49.0 mm (1.93 in)
Piston stroke: 35.5 mm (1.4 in)

Service Data

The Honda 4-stroke or an equivalent oil with a viscosity of SAE 10W-30 or 10W-40 is recommended for the G28 engine, refilling oil capacity is 0.7 L (0.74 US. qt, 0.62 Imp. qt.). Recommended spark plug is C-6HB with a 0.6-0.7 mm (0.0236-0.0276 in) spark plug gap.

Oil system
Lubrication system: Splash type
Oil type: SAE 10W-30 or 10W-40
Recommended oil: Honda 4-stroke or an equivalent
Oil capacity: 0.7 L (0.74 US. qt, 0.62 Imp. qt.)
Fuel system
Type: Horizontal type carburetor with butterfly valve
Ignition system
Type: High-voltage ignition
Spark plug: C-6HB
Spark plug gap: 0.6-0.7 mm (0.0236-0.0276 in)


Manufacturer or Brand Models
Honda F28
Honda E900

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