Snow Derby Classes

88 / 91 Yamaha Sno Scoot Stock

This class is for 1988 to 1991 Yamaha Sno Scoots. 5-12 year old kids may compete. Parent or guardian must sign the consent form for kids to compete.

  1. Any stock 1988 to 1991 Yamaha Sno Scoot may compete
  2. No Carbides
  3. No studs
  4. No 125cc Sno Sport models allowed.
  5. Clutch calibrations may be changed ( amount of rollers )
  6. Muffler / spark arrestor may be removed. Stock pipe must be used.
  7. Parents / legal Guardian:Must be present at the race. One parent / guardian may be at the start line. No crew members allowed past the start line. Specific liability form must be signed on race day.

120 Stock

120 stock is for kids 5-9 years old. Parent or guardian must sign the consent for for kids to compete.

  1. Can be any year or make, up to 120cc 4 stroke
  2. carbides allowed
  3. No studs
  4. Governor, Gear, Centrifugal clutch changes are permitted.
  5. No Belt drive systems allowed.
  6. Must have a chain guard.
  7. Parents / legal Guardian:Must be present at the race. One parent / guardian may be at the start line. No crew members allowed past the start line. Specific liability form must be signed on race day.

Kitty Cat Stock

Stock Kitty Cat is for kids ages 4-9 years of age. Parent or Guardian must sign the consent form for kids to compete.

  1. Any year Arctic Cat Kitty Cat may compete.
  2. No studs or carbides allowed
  3. Governors may be removed
  4. Gearing may be changed.
  5. No modifications other than Governors being removed and gearing changes may be made.
  6. Parents / legal Guardian:Must be present at the race. One parent / guardian may be at the start line. No crew members allowed past the start line. Specific liability form must be signed on race day.

120 Improved stock

120 Improved stock is for kids 6-10 years old. Parent or guardian must sign the consent for kids to compete.

  1. Can be any year or make, up to 120cc 4 stroke
  2. Engine must remain the original OEM engine for make / model.
  3. carbides allowed
  4. studs are allowed.
  5. Governor, Gear, Centrifugal clutch changes are permitted.
  6. Engine modifications are allowed.
  7. Must have a chain guard.
  8. Parents / legal Guardian:Must be present at the race. One parent / guardian may be at the start line. No crew members allowed past the start line. Specific liability form must be signed on race day.

ZR / Scoot 200 Stock

ZR / Scoot 200 is for kids 5-9. Parent or guardian must sign the consent form for kids to compete.

  1. Stock engine and chassis, no modifications allowed.
  2. Governor, Gear and clutch calibration changes are permitted.
  3. Drive and driven clutch must be OEM.
  4. Carbides allowed
  5. No studs
  6. Parents / legal Guardian:Must be present at the race. One parent / guardian may be at the start line. No crew members allowed past the start line. Specific liability form must be signed on race day.

120 Mod

120 Mod is for kids 6-10 years old. Parent or guardian must sign the consent form for kids to compete.

  1. 4 stroke engine up to 206cc with 6500 RPM limit.
  2. Studs allowed
  3. Carbides allowed
  4. Engine mods are permitted, must run on gasoline. No ethanol or exotic fuels allowed.
  5. Any governor or clutch mods are permitted.
  6. Chain guard must be in place.
  7. Parents / legal Guardian:Must be present at the race. One parent / guardian may be at the start line. No crew members allowed past the start line. Specific liability form must be signed on race day.

1975 and older 340 Fan cooled

Sleds racing in this class must be 1975 model year and older to compete. The engine must be the original engine for make / model / year and it must be fan cooled and 340cc or less.

  1. 1975 and older models may compete
  2. 340cc and under twin cylinder engine displacement may compete.
  3. No studs
  4. Carbides allowed
  5. No jackshaft models
  6. Any brand replacement track allowed. ¾ lug max
  7. Rear suspensions may be interchanged up to 1978
  8. Stock Secondary clutch.
  9. Stock drive clutch or Power Block / Comet 94c Duster
  10. Spreader allowed, up to 3 inches max increase.
  11. Steel skis only
  12. No adjustable handlebars.
  13. Stock appearing seat.
  14. Float type carbs allowed / no flatslides, Bore must be smaller than port.
  15. Stock Exhaust system only
  16. Stock Ignition system.
  17. No Rotary or Reed engines.

14-17 Youth / 440 fan twin 85 and older

Youth class 14-17

  1. Leaf sprung / fan cooled single cylnder 440cc and under, 1985 model year and older.
  2. Overboar allowed
  3. Butterfly or slide type carbs allowed / no flatslides
  4. Stock muffler and pipe.
  5. No programmable ignitions allowed
  6. No studs / Carbides allowed.
  7. Parents / legal Guardian:Youth under 18 years of age Parent or legal Guardian must be present to sign waiver

Formula IFS

The goal of Formula IFS is to build a class in the spirit of the Formula 56 class popular the 80s. It will allow sleds that had been performance rated by ISR to compete in the same class. This class will allow certain Fan / Free Air and Liquid cooled sleds to compete together while also allowing certain leaf and IFS sleds to compete together. Only listed sleds may compete. Additions to the qualified sled list can be made at the discretion of the Race Director. Below is the list of qualified sleds by manufacturer.

Models that May Compete

Arctic Cat

  • 1978   El Tigre 340
  • 1978-81   El Tigre 5000   500cc
  • 1979   Cross Country 340
  • 1985-90   Cougar AFS   500cc
  • 86-88   Pantera 440 L/C AFS

John Deere

  • 1979-84   Trailfire 440   436cc
  • 1976-78   Liquifier 340   339cc
  • 1976-78   Liquifier 440   436cc
  • 1979-83   Liquifier 440   436cc

Kawasaki

  • 1978-80   Invader 340   339cc
  • 1978-80   Invader 440   436cc

Mercury Marine

  • 1975-76   Trail Twister 440   436cc

Moto Ski

  • 1979-83   Futura LC   462cc

Polaris

  • 1976-80   TX 340   336cc
  • 1976-80   TX 440   432cc
  • 1977-80   TXL 340   333cc
  • 1980-82   TXL Indy 340   333cc
  • 1983   Cross Country 340   333cc
  • 1984-91   Indy 400   398cc
  • 1983-92   Indy trail   440 / 488

Ski Doo

  • 1984-89   Ski Doo Formula MX   462cc
  • 1978-81   Blizzard 6500 / 7500   339cc
  • 1978   TNT RV XC 340
  • 1979   Cross Country 340   336cc
  • 1980-82   Blizzard 5500   497cc
  • 1982-84   Blizzard MX   497cc
  • 1987-88   Stratos   496cc

Sno Jet

  • 1975   Thunderjet 440 F/A   433cc
  • 1975   SST 440 F/A   433cc

Yamaha

  • 1974-75   GPX 433   433cc
  • 1974-75   GPX 338   338cc
  • 1976-81   EX 440   433cc
  • 1980-85   SS 440   437cc
  • 1984-92   Phazer   485cc
  • 1981-89   SRV   535cc

Class Rules

  1. Engine must retain original concept cooling system.
  2. Engine must have original style ignition.
  3. No performance kits, OEM/aftermarket ex. GYT kits. Heads, cylinders, exhaust, ignition, carburetors.
  4. Chain case must be original, must maintain stock clutch covers, must have primary clutch covered.
  5. Skis: Stock replacement type skis of any manufacturer. No aluminum/plastic skis/skins. Up to 6 inch carbide only, no additional keels or runners. Runner will not stick down more than 9/16” from bottom of ski. No ski spreaders on IFS models, leaf spring may use spreaders, no offset +3 inches from stock max .
  6. Brakes will remain stock for year, make, and model
  7. Tracks: Original / stock replacement to 3⁄4” lug height. No longer than 121”. Changing track drivers is allowed. No cleated tracks unless stock track for that model / year was cleated. Cleated track models may convert to rubber. Rubber track models may not convert to cleats No special racing or “R” tracks, no cut down width tracks.
  8. Clutch: Drive clutch is OEM or Comet 94 Duster / 102C / 108C clutch springs/weights may be changed. Secondary clutches must be stock for year, make, model can change helix and spring.
  9. Suspension: Stock rear suspensions for year, make, and model no changes from stock. Stock front suspension, no widening or any other changes from stock on IFS models.
  10. Handlebars: Steering post mount must remain in stock position. Risers and hooks are permitted.
  11. Fuel tanks: Must be factory fuel tank for year, make, and model only and secured safely.
  12. Engine regulations: Engine must retain stock cooling type, Engine must be an available option for the chassis entered in the race.
  13. Engine regulations: Engine must retain stock cooling type, Engine must be an available option for the chassis entered in the race.
  14. Reed / reed cages must be OEM, no aftermarket. Carburetors are original size and type for year/make/model of sled/ engine being run. Jetting can be changed and airbox can be removed, oil pumps can be removed. Original exhaust for year / make / model. Pistons are stock replacement up to .040” oversize allowed. No port grinding, only edge chamfering. Must have stock port sizing. Bead blasting for cleanup only, cannot remove casting lines/port material. No porting /polishing of any type on any internal parts.
  15. Hoods and Belly pans may be changed or modified but must be well secured.
  16. Seats may be altered but Must be well secured.
  17. Studs allowed. Max height 3/8 above the track lug.

X Mod Open

This class is intended to be a builders class. Unlimited cc air cooled engines. Chassis and engine type do not need to match. Liquid sleds that already qualify for 500 mod may compete in this class as well.

  1. Air cooled engines 1985 and older, originally designed as a snowmobile engine may compete, no cylinder or CC limit.
  2. Liquid sleds that qualify for 500 mod can enter. 500 mod rules apply to them.
  3. Any internal or external mods are allowed on air cooled engines.
  4. Any after market exhaust system allowed on air cooled engines.
  5. Leaf Sprung 1985 or older chassis.
  6. Chassis and Engine brand do not need to match.
  7. Track lug 1 inch lug max.
  8. Studding allowed, 3/8 above lug max
  9. Carbides allowed.
  10. Any carbs, any size. No EFI
  11. Any Ignition.
  12. Seat must be firmly secured to chassis.
  13. No alcohol fuel permitted.
  14. Engine must be naturally aspirated.
  15. Any drive clutch
  16. Any driven clutch
  17. Gears and drivers may be changed, chaincase may be rolled.
  18. Chassis mods allowed, anything deemed to be a safety issue will disqualify the sled.
  19. Skis may be any commercially available aftermarket aluminum, plastic or steel ski. Leaf springs must be spring steel and functional.
  20. Brakes may be upgraded and the location may be moved, shielding must be in place if the disc is moved to the driveshaft.

F/C 400 single

1985 and older sleds may compete. Fan cooled single cylinder engines 400cc and under.

  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. Studs 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.
  12. Any type or brand of replacement track may be used, ¾ lug max.

Air Cooled 340 twin 85 and older

1985 and older F/A or F/C models may compete. 340 cc free air or fan cooled engines only.

  1. Air 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 / 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. No programmable ignitions
  10. Exhaust must be OEM for model without modification.
  11. Any type or brand of replacement track may be used, ¾ lug height max.
  12. Ski spreaders allowed, 3 inch max.
  13. Steel skis.
  14. Stock appearing seat.
  15. Float type carbs allowed / no flat slides, bore must be smaller than port.
  16. Stock exhaust system
  17. Stock ignition only.

50 Plus class

To compete, the driver must be 50 years of age or older. Sled must be a 1975 or older model year with a 440cc fan cooled engine or a 340cc Free Air engine to compete.

  1. Fan cooled twin cylinder 440cc or a Free Air twin cylinder 340cc engine may compete.
  2. 1975 and older sleds / engines may compete. Must be OEM for model and year.
  3. Drive clutch may be OEM or Comet 94c duster / power block.
  4. Driven clutch OEM
  5. Brakes may be upgraded but must remain original mounting and mounting location.
  6. Carbides allowed
  7. No studs allowed
  8. No internal or external engine modification allowed.
  9. No programmable ignitions
  10. Exhaust must be OEM for model without modification.
  11. Any type or brand of replacement track may be used, may have up to ¾ lug
  12. Suspensions may be interchanged up to model year 1978.
  13. Skis must be steel
  14. No adjustable handlebars.
  15. Seat must be stock appearing
  16. Float type carbs allowed / no flat slides, bore must be smaller than port.
  17. Ski spreaders allowed, 3 inch max

340 Air cooled Mod / Stock liquid cooled

Mod air cooled engines / stock liquid engines. 340 cc max.

  1. 340 cc max
  2. Air cooled engines may have any aftermarket exhaust system
  3. Liquid cooled engines must run their stock unmodified single pipe exhaust system.
  4. Leaf sprung chassis 1985 and older may compete.
  5. Any drive or driven clutch
  6. No EFI / must be naturally aspirated engines.
  7. Any carb allowed
  8. Engine brand must match chassis brand.
  9. Any track, 1 inch lug max
  10. Studding allowed, 3/8 max above track lug.
  11. Carbides allowed.
  12. Any internal or external engine modifications allowed on air cooled engines.
  13. No internal or external modifications on liquid engines.
  14. Any chaincase, any gears, any sprocket size
  15. Skis may be any commercially available steel, plastic or aluminum ski of leaf spring design. Springs must be steel and functional.
  16. Brakes may be upgraded and the location may be moved, shielding must be in place if disc is moved to the driveshaft.

Womens 440

Womans class. 1985 and older sleds may compete. 440cc twin air cooled engines.

  1. 1985 and older models may compete.
  2. 440cc and under Twin cylinder engine displacement may compete.
  3. Carbides allowed
  4. Studs allowed, not required, 3/8 max above track lug
  5. Any type or brand of replacement track may be used, max ¾ lug height.
  6. OEM driven clutch.
  7. Drive clutch must be OEM for model / make / year or Comet 102 / 94c or Powerbock
  8. Stock driven clutch
  9. Brakes may be upgraded, mounting location must remain the same.
  10. Handlebars may be modified or replaced with any commercially available handlebar. Hooks may be added
  11. Ski spreaders allowed, 3 inch max.
  12. Steel skis only.
  13. Stock appearing seat.
  14. Float type carbs allowed / no flatslide carbs, must be smaller than port.
  15. Stock exhaust system.
  16. Stock ignition system.

10-13 youth / 340 Fan Twin 75 or older

Youth class, 10-13 years of age.

  1. Must be a production line model as a 1975 or earlier model
  2. Over bore allowed
  3. Stock Muffler for sleds
  4. No reed or rotary valves
  5. Stock Ignition only
  6. Float type carb allowed
  7. No studs / Carbides allowed
  8. Parent / Legal Guardian:Youth under 18 years of age Parent or legal Guardian must be present to sign waiver.

Elan / Spirit 335

This class is for Elan or Spirit models. Engines may be changed up to 335 cc single. No 292 or 340 engines

  1. Up to 335 cc Rotax single may compete.
  2. No 292cc Rotax single or 250cc Rotax twin engines allowed.
  3. Stock clutches drive and driven.
  4. Slide rail or Bogie Elan / Spirit suspensions allowed.
  5. Stock Steel Skis only.
  6. HR carb or 34mm VM Mikuni allowed.
  7. Point ignition only.
  8. Stock exhaust systems only.
  9. No internal / external engine modifications allowed.
  10. Handlebar mods allowed.
  11. Carbides allowed
  12. Studs allowed, 3/8 above track lug max.
  13. Ski spreaders allowed, 3 inch max.

Air Cooled 440 twin 85 and older

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 OEM or Comet 102 / 94c duster / powerbock
  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
  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. Any type or brand of replacement track may be used, ¾ lug height max.
  12. Ski spreaders allowed, 3 inch max.
  13. Steel skis.
  14. Stock appearing seat.
  15. Float type carbs allowed / no flat slides, bore must be smaller than port.
  16. Stock exhaust system
  17. Stock ignition only

HR Stock Single Cylinder

1973 and older HR port sleds may compete.

  1. Must be a production line model offered to the public in 1973 and older with a fan cooled engine.
  2. Example : Arctic Cat / Puma, Cheetah, Panther, Lynx with and 1973 or older Arctic Cat fan cooled engine. Ski Doo / NTN, Olympic, Elan with any HR port fan cooled engine 1973 and older.
  3. Fan cooled engine only with HR port
  4. Engine must be available for model year.
  5. Example: Arctic Cat may run / Kohler, Sachs, JLO, Kawasaki or Hirth of any CC
  6. Over boar allowed to .060
  7. No Porting / stock ports
  8. Stock carb or float type replacement will be allowed. NO flat slides, carb bore must be smaller than the port.
  9. Stock muffler only.
  10. Point ignition only, no CDI
  11. No Reed or Rotary valves
  12. Stock suspension only
  13. Carbides allowed, 4 inch maximum carbide length.
  14. Shocks are permitted on skis.
  15. Stock secondary only.
  16. Stock clutch or 94c Duster / Power block drive clutches are permitted.
  17. ¾ inch lug track / stock length for model permitted.
  18. Seat must be stock appearing
  19. No adjustable handlebars
  20. Skis must be steel
  21. No studs.
  22. Ski spreaders allowed, 3 inch max.

500 Air cooled Mod / Stock liquid cooled 500

Mod air cooled engines / stock liquid engines. 500 cc max.

  1. 500 cc max
  2. Air cooled engines may have any aftermarket exhaust system
  3. Liquid cooled engines must run their stock unmodified single pipe exhaust system.
  4. Leaf sprung chassis 1985 and older may compete.
  5. Any drive or driven clutch
  6. No EFI / must be naturally aspirated engines.
  7. Any carb allowed
  8. Engine brand must match chassis brand.
  9. Any track, 1 inch lug max
  10. Studding allowed, 3/8 max above track lug.
  11. Carbides allowed.
  12. Any internal or external engine modifications allowed on air cooled engines.
  13. No internal or external modifications on liquid engines.
  14. Any chaincase, any gears, any sprocket size
  15. Skis may be any commercially available steel, plastic or aluminum ski of leaf spring design. Springs must be steel and functional.
  16. Brakes may be upgraded and the location may be moved, shielding must be in place if disc is moved to the driveshaft.

HR Stock Single Cylinder

1973 and older HR port sleds may compete.

  1. Must be a production line model offered to the public in 1973 and older with a fan cooled engine.
  2. Example : Arctic Cat / Puma, Cheetah, Panther, Lynx with and 1973 or older Arctic Cat fan cooled engine. Ski Doo / NTN, Olympic, Elan with any HR port fan cooled engine 1973 and older.
  3. Fan cooled engine only with HR port
  4. Engine must be available for model year.
  5. Example: Arctic Cat may run / Kohler, Sachs, JLO, Kawasaki or Hirth of any CC
  6. Over boar allowed to .060
  7. No Porting / stock ports
  8. Stock carb or float type replacement will be allowed. NO flat slides, carb bore must be smaller than the port.
  9. Stock muffler only.
  10. Point ignition only, no CDI
  11. No Reed or Rotary valves
  12. Stock suspension only
  13. Carbides allowed, 4 inch maximum carbide length.
  14. Shocks are permitted on skis.
  15. Stock secondary only.
  16. Stock clutch or 94c Duster / Power block drive clutches are permitted.
  17. ¾ inch lug track / stock length for model permitted.
  18. Seat must be stock appearing
  19. No adjustable handlebars
  20. Skis must be steel
  21. No studs.
  22. Ski spreaders allowed, 3 inch max.

14-17 Youth / 340 fan twin 75 or older

Youth class, 14-17 years old.

  1. Must be a production line model as a 1975 or earlier model
  2. Over bore allowed
  3. Stock Muffler for sleds
  4. No reed or rotary valves
  5. Stock Ignition only
  6. Float type carb allowed
  7. No studs / Carbides allowed
  8. Parent / Legal Guardian: Youth under 18 years of age Parent or legal Guardian must be present to sign waiver

1975 and older 440 Fan cooled

Sleds racing in this class must be 1975 model year and older to compete. The engine must be the original engine for make / model / year and it must be fan cooled and 440cc or less.

  1. 1975 and older models may compete
  2. 440cc and under twin cylinder engine displacement may compete.
  3. No studs
  4. Carbides allowed
  5. No jackshaft models
  6. Any brand replacement track allowed. ¾ lug max
  7. Rear suspensions may be interchanged up to 1978
  8. Stock Secondary clutch.
  9. Stock drive clutch or Power Block / Comet 94c Duster
  10. Spreader allowed, up to 3 inches max increase.
  11. Steel skis only
  12. No adjustable handlebars.
  13. Stock appearing seat.
  14. Float type carbs allowed / no flatslides, Bore must be smaller than port.
  15. Stock exhaust system only.
  16. Stock ignition system.
  17. No Rotary or Reed engines

340 Mod / Air cooled Open Combo

This combo class allows air cooled sleds 550 cc and under, with stock exhaust systems to race against 340 mod class sleds. Liquids that qualify for the 340 mod class may compete. 340 Mod class liquid guidelines apply for liquid sleds competing in this class.

340 mod rules

  1. 340 cc max
  2. Air cooled engines may have any aftermarket exhaust system
  3. Liquid cooled engines must run their stock unmodified single pipe exhaust system.
  4. Leaf sprung chassis 1985 and older may compete.
  5. Any drive or driven clutch
  6. No EFI / must be naturally aspirated engines.
  7. Any carb allowed
  8. Engine brand must match chassis brand.
  9. Any track, 1 inch lug max
  10. Studding allowed, 3/8 max above track lug.
  11. Carbides allowed.
  12. Any internal or external engine modifications allowed on air cooled engines.
  13. No internal or external modifications on liquid engines.
  14. Any chaincase, any gears, any sprocket size
  15. Skis may be any commercially available steel, plastic or aluminum ski of leaf spring design. Springs must be steel and functional.
  16. Brakes may be upgraded and the location may be moved, shielding must be in place if disc is moved to the driveshaft.

Air Cooled Open Rules

  1. F/C or F/A engine 550cc and under may compete.
  2. 1985 and older sleds / engines may compete, must be leaf sprung.
  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. studding allowed 3/8 above track lug max
  8. Any Track 1 inch lug track max
  9. Handlebars may be modified or replaced with any commercially available handlebar. Hooks may be added.
  10. No programmable ignitions
  11. Exhaust must be OEM for model without modification.
  12. Internal Engine modifications allowed.
  13. Any carb allowed, no EFI
  14. Skis may be any commercially available steel, plastic or aluminum ski of leaf spring design. Springs must be steel and functional.

10-13 Youth / 340 Fan single 1985 and older

Youth class, 10-13 years of age.

  1. Leaf sprung / fan cooled single cylnder 340cc and under, 1985 model year and older.
  2. Overboar allowed
  3. Butterfly or slide type carbs allowed / no flatslides
  4. No Reed or rotary valves, Must be a production model.
  5. Stock muffler and pipe.
  6. No programmable ignitions allowed
  7. No studs / Carbides allowed.
  8. Parent / Legal Guardian: Youth under 18 years of age Parent or legal Guardian must be present to sign waiver.

250 single Budget mod.   Exhibition class, Lancaster / Stratford

The intent of Budget mod 250 is to be an inexpensive, entry level Modified class. Engine and pipe modifications are allowed, and the drive clutch may be substituted for another type / brand to allow easier tuning. Chassis must remain stock.

  1. Sleds that can compete are as follows; Arctic Cat Lynx 2000S, Ski Doo 250 Citation, Polaris 250 Colt, 250 Gemeni, 250 Star, Yamaha Bravo, GP 246, Enticer 250.
  2. Chassis must remain stock and original to model.
  3. Suspensions must remain stock / original to model.
  4. Hoods and seat may be altered.
  5. Handlebars may be altered.
  6. Brake may be altered or switched to hydraulic type brake.
  7. Track may be replaced with an aftermarket track of same dimensions as OEM original. Lug height may be up to ½ inch.
  8. Carbides are allowed / Studs are allowed. 3/8 above lug height max.
  9. Any exhaust pipe is allowed.
  10. Original Cylinder may be ported.
  11. Original head may be cut.
  12. Ignition must remain OEM for model.
  13. Any Drive clutch is allowed. Driven clutch must remain OEM for model.
  14. Drivers must remain OEM size and type. Chain case must remain OEM for model and must remain in the stock location. Gear changes are allowed.
  15. Stock Carb or VM Mikuni allowed.

Fan Cooled Twin to 300cc

1985 and older fan cooled twins up to 300cc

  1. 1985 and older models may compete
  2. 300cc and under twin cylinder engine displacement may compete.
  3. No studs
  4. Carbides allowed
  5. No jackshaft models
  6. Any type or brand of replacement track may be used, ¾ lug max.
  7. Suspensions may be interchanged up to model year 1985
  8. OEM stock drive clutch or Powerblock / 94c duster
  9. Stock driven clutch.
  10. Steel skis only.
  11. Stock appearing seat
  12. Float type carburetors allowed, bore must be smaller than port.
  13. Ski spreaders allowed, 3 inch max.

Turner Stock Single

Sleds must be 73 or older production line models with single cylinder engines.

Sled must be a production line model, offered to the public.

  1. Model year 1973 or older. No limited production or RND models. Must be fan cooled.
  2. Must have point ignition.
  3. No performance kits.
  4. Single tether cord – must be operational before, during and after the race.
  5. Ski tips must be padded.
  6. Snow flaps must be no higher than 1 “ off the ground
  7. Cowling must be on sled at all times!

Motor Regulations

  1. Engine must be 1973 or older fan-cooled, Available option chassis entered in race.
  2. Carburetors must be original butterfly type
  3. Exhaust must be stock and in original position.
  4. Pistons are original or stock or replacement. Max - .060 oversize allowed. Stock stroke.

Chassis

  1. Chain case and braking must be original.
  2. If original track was cog driven than the replacement track must be cog driven
  3. Skis are original or stock replacement. (No plastic or aluminum skis.)
  4. Carbide runners are allowed.
  5. 3 inch spreaders allowed each side.

Fuel Tanks

  1. Must be original and in stock location.

Handle Bars

  1. Must be original. May be reinforced but not extended or raised. Hooks are allowed. Max width of 29 inches.
  2. Original throttle and brake controls.

Suspension

  1. Must be original

Track

  1. Original or stock replacement, Max ¾ of an inch lug height.
  2. Replacement rubber tracks allowed with ¾ inch lug height Tracks may not be cut, trimmed or shaved. R tracks are allowed for rubber conversion (15" width only), must widen stock suspension, new suspension mounting holes may be added to accommodate moving skid in a new location.
  3. Cleated replacement tracks are still allowed however cleats must be riveted on and cannot be sharpened or ends closed off.
  4. No traction devices allowed.

Drive Line

  1. Must be original. May change gear ratio, weights and springs
  2. Clutch center to center must be stock. May change belts.
  3. Clutch guards must be in place.
  4. Original clutch or Comet 94-C clutch allowed

250 Budget mod / 440 fan cooled combo

Combo class between 250 budget mod class sleds and 440 twin stock 75 and older sleds. Sleds that qualify for either of these classes may compete together.

250 Budget Mod rules

  1. Sleds that can compete are as follows; Arctic Cat Lynx 2000S, Ski Doo 250 Citation, Polaris 250 Colt, 250 Gemeni, 250 Star, Yamaha Bravo, GP 246, Enticer 250.
  2. Chassis must remain stock and original to model.
  3. Suspensions must remain stock / original to model.
  4. Hoods and seat may be altered.
  5. Handlebars may be altered.
  6. Brake may be altered or switched to hydraulic type brake.
  7. Track may be replaced with an aftermarket track of same dimensions as OEM original. Lug height may be up to ½ inch.
  8. Carbides are allowed / Studs are allowed. 3/8 above lug height max.
  9. Any exhaust pipe is allowed.
  10. Original Cylinder may be ported.
  11. Original head may be cut.
  12. Ignition must remain OEM for model.
  13. Any Drive clutch is allowed. Driven clutch must remain OEM for model.
  14. Drivers must remain OEM size and type. Chain case must remain OEM for model and must remain in the stock location. Gear changes are allowed.
  15. Stock Carb or VM Mikuni allowed.

440 twin stock 75 and older

  1. 1975 and older models may compete
  2. 440cc and under twin cylinder engine displacement may compete.
  3. No studs
  4. Carbides allowed
  5. No jackshaft models
  6. Any brand replacement track allowed. ¾ lug max
  7. Rear suspensions may be interchanged up to 1978
  8. Stock Secondary clutch.
  9. Stock drive clutch or Power Block / Comet 94c Duster
  10. Spreader allowed, up to 3 inches max increase.
  11. Steel skis only
  12. No adjustable handlebars.
  13. Stock appearing seat.
  14. Float type carbs allowed / no flatslides, Bore must be smaller than port.
  15. Stock exhaust system only.
  16. Stock ignition system.
  17. No Rotary or Reed engines

Outlaw Single

1974 and older may compete, no reed, no jackshaft. Engine mods and exhaust mods are allowed.

  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.