Pre '89 race class
The Pre '89 Senior and Junior classes have been expanded for the 2016 season. There are now Pre '89 classes F1, F2 and F3. The existing Senior will run as the new F1 class while Juniors will be split across F2 and F3.
Formula One
- 431cc-1300cc multi cylinder 2 Stroke
- 601cc-1300cc single cylinder 2 stroke
- 601cc-1300cc multi cylinder 4 stroke
Formula Two
- Grand Prix 250 2 Stroke
- 231cc-430cc multi cylinder 2 stroke
- 401cc-600cc 4 cylinder 4 stroke
- Up to 7450cc, 2 valve per cylinder air cooled twins
Formula Three
- 125cc-400cc multi cylinder 4 stroke
- Unlimited single cylinder 4 stroke
- Up to 600cc single cylinder 2 stroke
- Up to 250cc production based 2 stroke
- Up to 500cc twin cylinder 4 stroke