Yanmar Engine - QM Series
The QM series was available either sea-water or fresh-water cooled. 2:1 or 3:1 transmissions. A designation of F near the end of the model means it is fresh-water cooled. F=Factory Fresh Water This series includes the following engines:
| Engine | HP | Years In Production | Comments |
| 2QM | - | originally only distributed in Japan | |
| 2QM15 | 15 | 1977 - 1980 | 2 Cylinder |
| 2QM20 | 22 | 1975 - 1980 | Engines with serial numbers 0001 - 0030 were prototypes and may require different parts. Engines with serial numbers 80001 - 80930 and 81131 - 81180 were also different from the primary production models and may require different parts. Engines with serial numbers 80931 - 81130 and any serial number higher than 81181 will use standard 2QM20 parts. |
| 2QM20(F) | 22 | 1975 - 1980 | 2 Cylinder |
| 2QM20(H) | 22 | 1975 - 1980 | 2 Cylinder |
| 3QM | - | originally only distributed in Japan | |
| 3QM30 | 33 | 1976 - 1980 | 3 Cylinder |
| 3QM30(F) | 33 | 1976 - 1980 | 3 Cylinder |
| 3QM30(H) | 33 | 1976 - 1980 | 3 Cylinder |