| Year | 1951 |
| Date | 24-May |
| Volume | 104 |
| Issue | 2,609 |
| Page | 669 |
| Category | Petrol Engine Topics |
| Part | |
| Title | A 50-c.c. Auxiliary Engine ("Busy Bee") |
| Author | Edgar T.Westbury |
| Notes | Connecting-rod clearance, cylinder lappng, transfer port cover, cylinder-head, piston |