Northwoods Classes

Classes for 1985 and older (Northwoods / 603 Rules)

F/C 400 single (Northwoods / 603 Rules)

  1. Fan cooled single cylinder engine 400cc and under may compete
  2. 1985 and older sleds / engines may compete. Must be OEM for model and year.
  3. Drive clutch may be OEM or Comet 102 / 94c duster / powerblock
  4. Driven clutch OEM
  5. Brakes may be upgraded but must remain original mounting and mounting location.
  6. Carbides allowed
  7. Handlebars may be modified or replaced with any commercially available handlebar. Hooks may be added.
  8. No programmable ignitions
  9. Exhaust must be OEM for model without modification.
  10. General rules for 1985 and older apply.

F/C twin 340 (Northwoods / 603 Rules)

  1. Fan Cooled twin cylinder engine 340cc and under may compete.
  2. 1985 and older sleds / engines may compete. Must be OEM for model and year.
  3. Drive clutch may be OEM or Comet 102 / 94c duster / powerblock
  4. Driven clutch OEM
  5. Brakes may be upgraded but must remain original mounting and mounting location.
  6. Carbides allowed
  7. Handlebars may be modified or replaced with any commercially available handlebar. Hooks may be added.
  8. No programmable ignitions
  9. Exhaust must be OEM for model without modification.
  10. General rules for 1985 and older apply.

F/C Twin 440 (Northwoods / 603 Rules)

  1. Fan 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 OEM or Comet 102 / 94c duster / powerblock
  4. Driven clutch OEM
  5. Brakes may be upgraded but must remain original mounting and mounting location.
  6. Carbides allowed
  7. Handlebars may be modified or replaced with any commercially available handlebar. Hooks may be added.
  8. No programmable ignitions
  9. Exhaust must be OEM for model without modification.
  10. General rules for 1985 and older apply.

F/A stock 250 / 340 / 440 (Northwoods / 603 Rules)

  1. Free Air engine 250cc for 250 class, 340cc for 340 class and 440cc for 440 class.
  2. Engine size may race up to a larger cc class but can not race down.
  3. 1985 and older sleds / engines may compete. Must be OEM for model and year.
  4. Drive clutch may be OEM or Comet 102 / 94c duster / powerblock
  5. Driven clutch OEM
  6. Brakes may be upgraded but must remain original mounting and mounting location.
  7. Carbides allowed
  8. Handlebars may be modified or replaced with any commercially available handlebar. Hooks may be added.
  9. No programmable ignitions
  10. Exhaust must be OEM for model without modification.
  11. General rules for 1985 and older apply.

Outlaw single Cylinder (Northwoods / 603 Rules)

  1. Engine must be of air cooled / single cylinder design 1974 or older.
  2. No reed engines.
  3. No Jackshaft chassis.
  4. Hood design must match chassis for OEM / model year used.
  5. Any internal or external engine Mod allowed.
  6. Must be naturally aspirated.
  7. Any exhaust, silencer required.
  8. Any Carb, no fuel injection.
  9. Any drive or driven clutch
  10. Brakes may be upgraded and moved to driveshaft, guards must be in place.
  11. Skis may be steel, plastic or aluminum. Springs must be spring steel and functional.
  12. Max ski width 40” with no offset.
  13. Studding allowed. Max 3/8 above track lug.

Powder Puff (Northwoods / 603 Rules)

  1. 1985 and older models may compete.
  2. 440cc and under Twin cylinder engine displacement may compete.
  3. No studs
  4. No reed or rotary valves
  5. Carbides allowed
  6. General rules for 85 and older apply.