The 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) |
Applications
| Manufacturer or Brand | Models |
| Tillers | |
| Honda | F28 |
| Generators | |
| Honda | E900 |
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