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Rules.jpg
 
 

STOCK

1.     Sled must be a leaf spring mass produced consumer snowmobile. Single or twin cylinder.

ENGINE

1.     Must be OEM concept and size carburetor for model, no carb adapters allowed (i.e. HR uses HR, HD uses HD, VM uses VM), twin carbs legal if OEM for model (ie: Yamaha GP433, Ski-Doo TnT 640, Suzuki XR440, etc…)

2.     Exhaust and Muffler should be OEM for Brand and Model or reinforced stock OEM replacement. Motor must be correct for the brand and year limit. Motor must be correct for the brand and year limit. No performance options or kits.

Drive

1.     OEM or Comet 94C Duster only, No flyweight style clutches unless OEM for Brand and Model (i.e. Polaris or Deere Comet 100 series, Cat Hex etc…). Secondary (driven) clutch must remain stock for the brand. No rollers allowed. Recommended clutch engagement limit is 5500 rpm. It is strongly recommended that shatter-resistant and/or reinforced clutch guards be installed.

FRAM & BODY

1.     Hood must be as complete and correct for the sled as possible. Machine must have a belt guard. No chassis widening allowed. Seat should resemble original in thickness and contour. Handle Bars may have hooks added but must remain stock for model and brand. Running Boards may be altered for driver comfort.

2.     Fuel tank must be original or of same size in original location.

SKIS & SKI RUNNERS

1.     Use of different manufacturer’s skis allowed. Steel Skis only, no aluminum skis unless installed as OEM equipment. No steering system dampers unless installed as OEM equipment.  Suspension may be reinforced but must include entire original system. No slide lubbers allowed, but Ice scrapers may be used.

TRACK & TRACTION

1.     Cleated tracks will be allowed only on models that came stock with a cleated track and with less than 65 hp. Traction devises may be used but must not exceed 3/8” above tallest point of the track. Cleated tracks must be in good condition and will be inspected thoroughly for safety.

 

 

SUPER STOCK

In stock and stock based classes, change or modification is allowed unless specifically allowed by these rules. If these rules do not specifically allow a change or modification, then it must be assumed that the change or modification is not allowed.

1. Any stock qualified, LEAF SPRING MODEL 1985 or older is eligible. No limited production or race only models (such as ’76 and ‘77 Yamaha SRX, Mercury Snow Twister, Ski Doo Blizzard, Arctic Cat Z OR EXT).

2. Entries will be segregated into classes based upon engine cooling (i.e. Fan, Free-air, Liquid)

SUGGESTED CLASSES

SUPER STOCK 250 264cc maximum

SUPER STOCK 300 317cc maximum

SUPER STOCK 340 358cc maximum

SUPER STOCK 440 464cc maximum

SUPER STOCK 650 680cc maximum

SUPER STOCK 800 836cc maximum

ENGINE

1.     Engine must be OEM for model and year.

2.     Engine, engine mounts and exhaust must remain in original OEM for model and locations of chassis.

3.     Any internal modification allowed to engine.

4.     No external modifications allowed.  Engine must maintain OEM for model and appearance.

5.     Engine bore size may be increased to class limit.  (See above)

6.     Aftermarket pistons allowed.

7.      Intake concept (for the engine) must be maintained (i.e. piston port, reed valve, etc.)

8.     Any round slide carburetor from a stock qualified snowmobile is allowed. Flat slide carburetors not allowed. Air intake silencers (air boxes) may be removed.

9.     Cooling system concept (for the engine) must be maintained and fully functioning (i.e. free-air, fan, etc.).

10.   Must be naturally aspirated.

11.   OEM-for-the-model exhaust system must be used.

12.  The only legal ignitions will be OEM 1985 and older. All ignitions must be derived from a stock qualified model 1985 and older, or a designated aftermarket replacement of the original component.

13.  Programmable ignitions are not allowed.

DRIVE

1.      Any snowmobile brand OEM primary clutch allowed.

2.     Secondary clutch must OEM for the model chassis.

3.     Chaincase must be OEM. For model and year.

4.     Chaincase may be moved up to two inches.

5.     Any track drive shaft and track drive sprockets may be used.

6.     Track drive shaft may be relocated a maximum distance of 2 inches.

7.     For chassis’ without jackshaft, a jackshaft may not be added.

8.     Jackshaft models must use OEM for the model jackshaft.

9.     Brake components may be replaced. Must be commercially available and not modified.

 

SKI SUSPENSION AND STEERING

 

1.     Any steel or aluminum ski with a minimum 20” leaf spring

2.     Leaf springs must be steel and functional.

3.     Ski spreaders allowed. Maximum increase 3 inches (each ski).

4.     Only oil filled shocks can be used on the skis. Shocks must mount in original position.(No Gas Shocks).

5.     Spindles must be enclosed.

6.     No Cobra skis allowed.

7.     Steering column must be OEM for model chassis.  The handle bars and or handle bar mounting bracket may be replaced.

8.     Any commercially available handlebar allowed.

 

TRACK SUSPENSION

 

1.     Any track suspension from a stock qualified, 1985 or older model is allowed. Suspension must be used with no modification allowed. Marginal snow wheels can be added or deleted.

2.     Remote Adjusters are not allowed.

 

TRACK AND TRACTION

 

1.     Any commercially available one-piece molded rubber track allowed. Track must fit within the confines of the tunnel without modification to track.

2.     The track must be used as produced by the molder of the track. No cutting or other modifications allowed.

FRAME AND BODY

1.     Frame must be OEM for the year and brand.

2.     No modifications allowed to frame.

3.     Hood must be OEM-for-the-model.

4.     Windshield may be modified, replaced or removed.

5.     Headlight must be taped or removed and blocked with like material.

6.     Fuel tank must be OEM-for-the-model and year or an exact aftermarket replacement.

7.     Seat must maintain OEM contour and stock appearance for the model. Minimum seat thickness is 3 inches.

 

MOD  STOCK

1.     . Any stock qualified LEAF SPRING MODEL 1985 or older is eligible.

2.     Entries will be segregated into classes based upon engine cooling (i.e. Fan, Free-air, Liquid).

MOD STOCK SUGGESTED CLASSES

MOD STOCK 250 264cc maximum

MOD STOCK 300 317cc maximum

MOD STOCK 340 358cc maximum

MOD STOCK 440 464cc maximum

MOD STOCK 800 836cc maximum

ENGINE

1.     Engine must be OEM for model and year.

2.     Engine, engine mounts  in original OEM for model location of chassis.

3.     Any internal modifications allowed to the engine. Cylinder head hold down kits allowed. Heads may not be changed to accept hold down kit.

4.     No external modifications. Engine must maintain OEM for model appearance.

5.     Engine bore size may be increased up to class limit (see above).

6.     Aftermarket pistons allowed.

7.     Intake concept (for the engine) must be maintained (i.e. piston port, reed valve, etc.)

8.     Round slide Mikuni carburetors from a stock qualified snowmobile only. No other carburetors allowed. No Flat slide/D.slide, or "peanut" carburetors allowed. Air intake silencers (air boxes) may be removed.

9.     Cooling system concept (for the engine) must be maintained and fully functioning (i.e. free-air, fan, etc.).

10.    Must be naturally aspirated.

11.  Air intake silencers (air boxes) may be removed.

12.   Any exhaust allowed.  A commercially available silencer is required.

13.   Any 1985 and prior OEM ignition allowed.

DRIVE

1.     Any snowmobile brand OEM primary clutch allowed.

2.     Any snowmobile brand OEM secondary clutch allowed. No roller secondary clutches allowed.

3.     Chaincase must be OEM.

4.     Chaincase may be moved up to 2 inches.

5.     Any track drive shaft and track drive sprockets allowed.

6.     Track drive shaft may be relocated a maximum distance of 2 inches.

7.     For chassis’ without jackshaft, a jackshaft may not be added.

8.     Jackshaft models may use any jackshaft.

9.     Brake components may be replaced. Must be commercially available and not modified.

SKI SUSPENSION AND STEERING

1.     Skis must be aluminum or steel.

2.     Leaf springs must be steel and functional. Leaf spring minimum length: 20 inches.

3.     Shock absorbers must be oil only, gas shock absorbers not allowed.

4.      Spindles and cross member ends must be enclosed.

5.     Ski spreaders allowed. Maximum increase 3 inches (each ski).

6.     Any OEM or commercially available spindle is allowed . No modification to the spindle housing is allowed.

7.     No Cobra skis allowed.

8.     Steering column must be OEM for model chassis.   The handlebars and/or handlebar mounting bracket may be modified or replaced.

9.     Any commercially available handlebar allowed.

TRACK SUSPENSION

1.     Remote adjustors are not allowed.

2.     Any OEM track suspension from a stock qualified, 1985 or older model is allowed. Original cleat track suspensions may be modified to fit required rubber tracks. Suspension limiting devices may be added. Wheels may be added, changed or removed.

TRACK AND TRACTION

1.     Any commercially available one-piece molded rubber track allowed. Track must fit within the confines of the tunnel without modification to track.

2.     The track must be used as produced by the molder of the track. No cutting or other modifications allowed.

FRAME AND BODY

1.     Frame must be OEM for the year and brand.

2.     Frame reinforcement allowed. Frame must maintain stock dimensions.

3.     Hood must be OEM-for-the-model. Windshield may be modified, replaced or removed.

4.     Headlight must be taped, or removed and blocked with like material.

5.     Any fuel tank may be used but must remain in stock location.

6.     Any seat may be used but must remain in the original location. Seat must retain 3 inches of thickness.

SUPER MOD

1.     1. Any 1985 or older Stock Qualified leaf spring model allowed.  1972 and 73 Chaparrals also allowed.

2.     On Chapparals, sway bar must be used in OEM location. A larger diameter sway bar may be used. To mount a larger diameter sway bar, the location may be moved up or down to clear drive.

SUGGESTED CLASSES

SUPER MOD 300 317cc maximum

SUPER MOD 340 358cc maximum

SUPER MOD 440 464cc maximum

SUPER MOD 650 680cc maximum

SUPER MOD 800 836cc maximum

ENGINE

1.     The engine must be OEM for the brand and 1985 production or earlier.

2.     Any internal modifications allowed to the engine.

3.     Engine bore size may be increased up to class limit (see above).

4.     Any round or flat slide, or D-slide snowmobile carburetor allowed. Fuel injection is not allowed.

5.     Air intake silencers (air boxes) may be removed.

6.     Any exhaust allowed. A commercially available silencer is required.

7.     Must be naturally aspirated.

DRIVE

1.     Any primary clutch allowed.

2.     Any secondary clutch allowed. Roller secondary clutches allowed.

3.     Any snowmobile chain case.

4.     Jackshaft installation allowed.

5.     Any track drive shaft and track drive sprockets allowed.

6.     Track drive shaft may be relocated.

7.     Brake components may be replaced. Must be commercially available and not modified.

8.     If brakes are relocated to front drive shaft any external components must be properly

shielded to avoid driver contact.

SKI SUSPENSION AND STEERING

1.     Skis must be steel or aluminum.

2.      Leaf springs must be steel and functional.

3.     Ski spreaders allowed. Maximum increase 3 inches (each ski).

4.     No Cobra skis allowed.

5.     Any commercially available handlebar or steering column allowed.

TRACK SUSPENSION

1.     Any track suspension allowed.

2.     Remote adjustors are not allowed.

TRACK AND TRACTION

1.     Any commercially available one-piece molded rubber track allowed. Track must fit within the confines of the tunnel without modification to track.

2.     The track must be used as produced by the molder of the track. No cutting or other modifications allowed.

FRAME AND BODY

1.     Reproduction chassis are allowed but must be built using exact measurements of bulkhead of the original production snowmobile.

2.     Frame must 1985 and older or a 1985 or older reproduction.

3.     Frame reinforcement allowed.

4.     Frame may be widened up to a 40” center-to-center carbide width.

5.     Hood must be OEM for the brand.

6.     Windshield may be modified, replaced or removed.

7.     Headlight may be removed.

8.     Fuel tank must be OEM-for-the-model or an OEM or aftermarket replacement snowmobile tank.

9.     Any seat allowed.