| Pro AM Open Saturday/Sunday |
Maximum 600cc 2 stroke, 1050cc 4 stroke |
| Pro Super Stock Saturday/Sunday |
*Super Stock designated models - Refer to ISOC Official Rulebook |
| Pro Am +30 Super Stock Saturday/Sunday |
*Super Stock designated models - Refer to ISOC Official Rulebook |
| Pro Am Women Super Stock Saturday/Sunday |
*Super Stock designated models - Refer to ISOC Official Rulebook |
| Semi Pro Super Stock Saturday/Sunday** |
*Super Stock designated models - Refer to ISOC Official Rulebook |
| Sport Super Stock Saturday/Sunday |
*Super Stock designated models - Refer to ISOC Official Rulebook |
| Novice Super Stock Saturday/Sunday |
*Super Stock designated models - Refer to ISOC Official Rulebook |
| Plus 40 Saturday/Sunday |
*Super Stock designated models - Refer to ISOC Official Rulebook |
| Junior 16-17 Saturday/Sunday |
Maximum 500cc Liquid Cooled, 600cc Fan Cooled, 600cc "Throttle Restricted" Super Sport and all Yamaha Phazer models |
|
|
Maximum 500cc Liquid Cooled, 600cc Fan Cooled, 600cc "Throttle Restricted" Super Sport and all Yamaha Phazer models |
|
|
Maximum 600cc Fan Cooled |
|
|
Maximum 300cc Fan Cooled |
|
|
120cc Stock |
|
|
120cc Stock |
|
|
120cc Stock |
|
|
120cc Modified |
| |
*Super stock designated units conform to ISR Super Stock 600 Engine Limitations |
| |
**Semi Pro can run either Semi Pro Super Stock or Pro Am Open, but not both |