| produce power | 0.68 |
| become less popular | 0.43 |
| feature noticeably fast… | 0.38 |
| feature acceleration | 0.38 |
| use piston | 0.25 |
| eliminate the need | 0.24 |
| pay off with their firs… | 0.16 |
| be incapable of self-as… | 0.16 |
| lighter | 0.52 |
| efficient | 0.47 |
| heavier | 0.45 |
| cheaper | 0.38 |
| powerful | 0.34 |
| light | 0.32 |
| simpler | 0.32 |
| inefficient | 0.29 |
| more compact | 0.24 |
| more expensive | 0.16 |
| air-cooled | 0.43 |
| an internal combustion … | 0.25 |
| fitted with blower | 0.49 |
| considered aspirated | 0.32 |