| Year | 1972 |
| Date | 21-Jan |
| Volume | 138 |
| Issue | 3,433 |
| Page | 86 |
| Category | Internal Combustion |
| Part | 2 |
| Title | A Twin-cylinder Four-stroke engine |
| Author | P.Bennett of San Francisco |
| Notes | Carburettors and exhaust, electrical, bearing holders, assembly, setting up to run, summary |