1978 AMA Pro Motocross Championship Cycle World USA: 500MX Results
June 18, 1978
- Monster Energy AMA Supercross Championship
- AMA Pro Motocross Championship
- SuperMotocross World Championship
- FIM Motocross World Championship
- Progressive GNCC Racing
- Motocross of Nations
- FIM World Supercross Championship
- Australian Supercross Championship
- Women's Motocross Championship
- Monster Energy Cup
500MX Results
| Rider | Hometown | Motos | Bike | |
|---|---|---|---|---|
| 1 | | Lakewood, CA | 1 - 1 | Yamaha |
| 2 | | San Diego, CA | 2 - 4 | Honda |
| 3 | | Orangevale, CA | 4 - 3 | Suzuki |
| 4 | Marty Smith | San Diego, CA | 6 - 2 | Honda |
| 5 | | Fontana, CA | 3 - 7 | Yamaha |
| 6 | | Lisbon, OH | 11 - 5 | Can-am |
| 7 | | Reno, OH | 10 - 8 | Maico |
| 8 | | Forest City, NC | 9 - 9 | Yamaha |
| 9 | | Yucca Valley, CA | 8 - 10 | Suzuki |
| 10 | | Sandy, OR | 14 - 6 | Yamaha |
| 11 | | Cheektowaga, NY | 12 - 11 | KTM |
| 12 | | Bristol, PA | 5 | Suzuki |
| 13 | | Woodside, CA | 13 - 14 | Husqvarna |
| 14 | | Farmingdale, NJ | 7 | Yamaha |
| 15 | | Austin, TX | 16 - 13 | Kawasaki |
| 16 | | Tipp City, OH | 17 - 15 | Suzuki |
| 17 | | Newburgh, NY | - 12 | Suzuki |
| 18 | | Medina, OH | 15 - 18 | Maico |
| 19 | | Painesville, OH | 20 - 16 | |
| 20 | | Aliquippa, PA | - 17 | |
| 21 | | Buchanan, MI | 19 - 19 | |
| 22 | | Thornton, CO | 18 | |
| 23 | | East Stroudsburg, PA | - 20 |


