Cox model engine Cylinders Cylinders

| Engine | Exhaust_Ports | Bypass_Ports | Bypass_Boosters | SPI | Tapered_Grind | Number_on_cyl_ |
|---|---|---|---|---|---|---|
| Space Bug | Open | 2 | 0 | Yes | Yes | None |
| Thermal Hopper | Open | 2 | 0 | Yes | Yes | None |
| Space Bug Jnr | Open | 1 | 0 | Yes | Yes | None |
| Space Hopper | Open | 2 | 0, 2 side flutes in 1961 | Yes | Yes | None, #4 on 1961 models |
| Strato Bug | Open | 2 | 0 | Yes | Yes | None |
| Product Engine | Open | 1 | 0 | Yes | Yes, No after Leisure | 2 |
| SureStart | Slit | 2 | 1 | No | No | None |
| Babe Bee | Open | 1 | 0 | Yes | Yes, No after Leisure | 2 |
| Golden Bee | Open | 1 | 0 | Yes | Yes, No after Leisure | 2 |
| Black Widow pre 96 | Open | 2 | 0 | Yes | No | 1 |