1985 and Older Air Cooled Twin
1985 and older F/A or F/C models may compete. 440 cc free air or fan cooled engines only.
  1. Air Cooled twin cylinder engine 440cc and under may compete.
  2. 1985 and older sleds / engines may compete. Must be OEM for model and year.
  3. Drive clutch may be any OEM or Comet 102 / 94c duster / powerbocks
  4. Driven clutch OEM
  5. Brakes may be upgraded but must remain original mounting and mounting location.
  6. Carbides allowed
  7. Studs allowed 3/8 above track lug max
  8. Handlebars may be modified or replaced with any commercially available handlebar. Hooks may be added.
  9. Exhaust must be OEM for model without modification.
  10. Any type or brand of replacement track may be used, ¾ lug height max.
  11. Ski spreaders allowed, 3 inch max.
  12. Steel skis.
  13. Stock appearing seat.
  14. Stock number of carbs per original application / Diaphragm or Float type carbs allowed / no flat slides, .
  15. Stock exhaust system.