| Gasoline Engine |
| Model | RO-28A | RO-28B |
| Type | Air-cooled,4-cycle single cylinder,side valve,gasoline engine |
| Bore*stroke (mm) | 75*62 | 75*62 |
| Displacement (mL) | 273 | 273 |
| Rated output KW(HP)/rpm | 4.2(5.7)/3600 | 4.2(5.7)/1800 |
| Max output KW(HP)/rpm | 5.91(8.0)/4000 | 5.91(8.0)/2000 |
| Direction of Rotation | Counterclockwise,facing P.T.O shaft |
| Fuel | Automobile Gasoline(unleaded) |
| Fuel tank capacity (L) | 5.5 | 5.5 |
| Lubricating oil capacity (L) | 0.85 | 0.85 |
| Spark Plug | E6TC | E6TC |
| Starting system | Recoil starter |
| Packing size:L*W*H (mm) | 440*380*460 | 445*380*490 |
| Net Weight(kg) | 21.5 | 22 |
