| Year | 1968 |
| Date | 21-Jun |
| Volume | 134 |
| Issue | 3,347 |
| Page | 585 |
| Category | Internal Combustion |
| Part | 4 |
| Title | Model Petrol Engines |
| Author | Edgar T.Westbury |
| Notes | Small two-stroke development review. Crankcase compression, piston design, composite pistons, deflectors, the "Zephyr" 2 1/2 cc engine |