| Pro Open |
Maximum 600cc 2 stroke, 1050cc 4 stroke |
| Pro Super Stock |
*Super Stock designated models - Refer to ISOC Official Rulebook |
| Pro Plus 30 Super Stock |
*Super Stock designated models - Refer to ISOC Official Rulebook |
| Pro Women Super Stock |
*Super Stock designated models - Refer to ISOC Official Rulebook |
| Semi Pro Open |
Maximum 600cc 2 stroke, 1050cc 4 stroke |
| Semi Pro Super Stock #1 & #2 |
*Super Stock designated models - Refer to ISOC Official Rulebook |
| Sport Women Super Stock |
*Super Stock designated models - Refer to ISOC Official Rulebook |
|
Sport Super Stock #1 & #2
|
*Super Stock designated models - Refer to ISOC Official Rulebook |
| Junior 16-17 |
Maximum 500cc Liquid Cooled, 600cc Fan Cooled, 600cc "Throttle Restricted" Super Sport and all Yamaha Phazer models |
| Junior 14-15 |
Maximum 500cc Liquid Cooled, 600cc Fan Cooled, 600cc "Throttle Restricted" Super Sport and all Yamaha Phazer models |
| Junior Novice 10-14 |
Maximum 600cc Fan Cooled |
| Transition 8-12 |
Maximum 300cc Fan Cooled |
| 120 Champ 7-14 |
|
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