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.
|Type||4-stroke, single cylinder|
|Displacement||67 cm 3 (4.09 cu-in)|
|Max. horsepower||2.8 HP (2.23 kW) at 6000 rpm|
|Carburetor||Horizontal, butterfly valve|
|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||2.6 L|
|PTO shaft rotation||Counterclockwise (from PTO shaft side)|
|Oil type||Honda 4-stroke or an equivalent|
|Recommended oil||SAE 10W-30 or 10W-40|
|Oil capacity||0.7 l|
|Spark plug||NGK: C-6HB|
|Spark plug gap||0.6-0.7 mm (0.024-0.028 in)|