Safety:
All drivers must wear a fullface helmet with eye protection
All drivers must wear a chest protector
All sleds must have a working tether
All sleds must have a snow flap that touches the ground with driver on board
All sleds must have ski loops
All sleds must have a hood
All sleds must have functional brakes
All sleds must have a clutch guard
General:
3/8 max length of studs above the highest point of the track
Lubbers are allowed on all race sleds, no green slide lube
Cleated tracks allowed. TRACKS MUST BE IN GOOD CONDITION!
Classic Stock 400:
Any 1995 & Older Production Sled., 340cc Liquid or 400cc Liquid.
340cc - Max Carb size 38mm round slide.
400cc - Max carb size 34mm round lside.
There are no reed valve motors allowed! Piston port non variable exhaust motors only.
MOTORS AND EXHAUST ARE TO REMAIN COMPLETELY STOCK.
Stock ignition, handlebar warmers, key, and head light may be un hooked. Tethers are mandatory.
Pump gasoline only.
Stock clutching for model. Springs and weights may be changed.
Stock chaincase. Gears may be changed.
Stock hood and pan. Stock gas tank. Stock seat, may be cut down for driver comfort.
Foot rests may be added.
Slide lube system may be added.
Racing handlebars allowed.
No front suspension pieces may be changed, front end must remain stock width, stock Fox Shocks that came on sleds, Example Polaris XCR's allowed, Stock replacement aftermarket shocks allowed, No FOX racing shocks. Stock Skis.
Stock rear suspension only, the only thing that may be modified is the front arm, front arm shock may be romoved.
Stock tracks only, may be replaced with stock replacement aftermarket tracks. No racing tracks.
Classic Stock 440/500/Open:
Must Start with Any Polaris, Artic Cat, Ski-Doo, or Yamaha stock production machine 1995 or older.
There are no reed valve motors allowed! Piston port non variable exhaust motors only.
MOTORS AND EXHAUST ARE TO REMAIN COMPLETELY STOCK.
Motors will be randomly tore down!
Stock ignition, handlebar warmers, key, and head light may be un hooked. Tethers are mandatory.
Pump gasoline only.
Stock size carbs no larger than 38 mm round slide.
Stock clutching for model. Springs and weights may be changed.
Stock chaincase. Gears may be changed.
Stock hood and pan. Stock gas tank. Stock seat, may be cut down for driver comfort.
Foot rests may be added.
Slide lube system may be added.
Racing handlebars allowed.
No front suspension pieces may be changed, front end must remain stock width, stock Fox Shocks that came on sleds, Example Polaris XCR's allowed, Stock replacement aftermarket shocks allowed, No FOX racing shocks. Stock Skis. Racing skis allowed on open cc sleds.
Stock rear suspension only, the only thing that may be modified is the front arm, front arm shock may be romoved.
Stock tracks only, may be replaced with stock replacement aftermarket tracks. No racing tracks.
Formula 440:
Must Start with Any Polaris, Artic Cat, Ski-Doo, or Yamaha stock production machine 1995 or older.
Chassis may be modified. Any seat, tank, handlebars, hoods, pans, etc.
45 inch max front end width. Must keep original front end geometry but parts may be changed. Any racing shocks, no float shocks.
Racing skis allowed.
Must start with stock rear suspension, any modifications allowed.
Any 121" x 15" track, No R tracks.
Stock type drive clutchs, clutch brand doesnt have to match sled. Any secondary clutch.
Stock engines. Any pipes. Stock ignition.
FORMULA-340 Rules:
1992 and older standard production Polaris Indy models.
ENGINE – 340cc Fuji (Polaris L/C) engine only. May bore .040” over stock bore.
CHASSIS –Engine & mount, jackshaft, chain case, and exhaust must remain in original locations.
IGNITION, EXHAUST, CHAIN CASE – Stock OEM for the model.
CARBURETOR - OEM, original size.
CLUTCHES – Any OEM. No roller secondary.
FRONT SUSPENSION - 42” maximum between carbide centers, maximum offset 1” from center line (22” right & 20” left of bulkhead center).
Springs, shocks, sway bar & link, radius rods, and trailing arms may be changed or modified but must fasten to stock locations on bulkhead/tunnel. 2.5” minimum travel at front of bulkhead.
REAR SUSPENSION – Stock Polaris components only; except any springs, shocks, limiters. Components may be moved, removed, relocated.
TRACK – 15” x 121” OEM or OEM replacement rubber track. No racing (R) tracks.
DRIVESHAFT, JACKSHAFT – Steel, OEM for the model.
BRAKES, SKIS, HOOD, BELLY PAN, STEERING, SEAT, FUEL TANK – Any.
Formula 500:
Must start with 1992 or older Polaris Indy 500 Carburated models!
The brand of hood does not need to match sled.
No component of the engine may be altered, changed or enlarged from the engine manufacturer’s original stock specifications, nor may any additional components be added to the engine. No engine kits allowed. Aftermarket or OEM stock replacement gaskets and Pistons allowed.
Replacing OEM carburetor slide valve and replacement jet components without modification allowed. No modification to carb body allowed. Stock OEM Carb size for model.
Thermostat may be removed.
Cooling system must remain completely stock and in the OEM location .
The exhaust system must be OEM for the model and be mounted in the OEM location for the model. Welded-on after muffler and internal stinger pipe may be removed and replaced with any size stinger. The exhaust system must be functionally silenced. The ball socket on exhaust chamber may be repaired or replaced but MUST maintain original tuned length and inside diameter. NO OTHER CHANGES ALLOWED.
No changes or repairs allowed to “Y” pipe.
Engine must remain in stock location and must use stock engine plate and mounts. Torque limiters allowed.
The primary clutch must be a POLARIS drive clutch, model P-85. No machining, grinding, cutting or welding allowed on the clutch. Any combination of springs, weights, ramps may be used. Metal may be removed but not added to ramps or flyweights in the primary clutch.
Any driven clutch may be used. Driven clutch and components may be modified.
Chain case, jackshaft, brake disc and track shaft must remain stock and in stock location; no modifications or lightening allowed. Chain and sprocket ratio may be changed. Belt drive system is not allowed.
Brake cooling duct, inside the hood, is allowed
Ski suspension and steering must be OEM for the model unless otherwise specified
Radius rods and tie rods may be replaced or modified.
Maximum outside to outside width across the skis is 45 inches.
Must use all original suspension mounting points on chassis and struts.
May use any spring or spring adjusters. Titanium springs are not allowed.
POLARIS part # 7041144 is the only OEM ski shock allowed. KIMPEX part # 08-113 is the only replacement ski shock allowed
Sway bars may be replaced but must fit in stock location thru bulkhead.
Limiter strap allowed, but must maintain two and a half (2.5) inches of usable downward travel with the driver seated. Travel measured at the front bumper.
Suspension components may be reinforced but no geometry changes are allowed except camber.
The steering column and handlebars may be relocated and / or replaced, including extensions, to fit the driver. All ends must be plugged. The handlebar must be of the same material with the same wall thickness (or greater) and tubing outside diameter.
Throttle lever may be replaced but must be thumb operated with a direct mechanical operated mechanism on rear side of right handlebar
May use aluminum racing skis.
Complete track suspension and components MUST be OEM stock for the model unless otherwise specified.
Track suspension must maintain a minimum of 2 inches of useable, vertical travel with the driver seated.
May drill new holes in tunnel or rail to change mounting locations. May not drill excessive amount of holes for lightening.
May modify or replace springs. Titanium springs are not allowed.
POLARIS part # 7041142 is the only OEM front shock of the rear suspension allowed. KIMPEX part # 04-271 is the only replacement front shock of the rear suspension allowed.
May remove front shock.
POLARIS part # 7041250 is the only OEM rear shock of the rear suspension allowed. KIMPEX part # 04-235 is the only replacement rear shock of the rear suspension allowed.
May relocate rear shock.
May change or add limiters to front and rear of track suspension. No remote limiter adjusters allowed.
May add or subtract marginal snow wheels and their mounts.
May add slide lubrication system.
Any commercially available rubber track 121 inches x 15 inches is allowed. Minimum track lug height is .50 inch.
The track must be used as produced by the molder of the track. No cutting or other modifications allowed.
Chassis may be reinforced.
May alter or replace hood, windshield, belly pan, seat, fuel tank and foot stirrups
May remove bumpers, dash panels, oil tank, lights and wiring.
Ignition system MUST be OEM stock for this engine, no modification allowed. May not lighten flywheel.
Any OEM snowmobile taillight is allowed but must have 1157 bulb with brake element illuminated whenever engine is running.
Instruments, gauges and headlight may be removed.
Spark plugs, spark plug wires and connector not have to be OEM.
Sportsman 440/600: 2000 & Older
Race sled description
2000 & Older production Arctic Cat, Ski Doo, Yamaha, or Polaris snowmobile, of 440/600 cc engine volume or less.
Sled must retain the following:
Original tunnel and bulkhead for the model
Original type engine for the model.
Front suspension concept must remain as produced, (i.e. trailing arm, strut, a-arm, etc) but may be altered in the following manner:
Original springs may be altered or replaced
Original shocks may be replaced, or altered, aftermarket shocks are allowed.
A-arms, trailing arms, struts, may be changed but must be OEM for the brand.
OEM for the brand torsion bars may be altered to fit the chassis being used.
Limiters and other methods of travel restriction are legal, but he snowmobile must have 2 (two) inches of useable front travel minimum.
Rear Suspension must be OEM for the brand.
Rear suspension may be altered in the following manner:
Shocks may be altered, removed, or rendered inoperable as needed.
The suspension must bolt to the chassis within the confines of the original mounting plate reinforcements of the chassis selected.
Suspension springs may be replaced with non-OEM springs.
Aftermarket shocks may be used.
Track
Track may be OEM for the brand, or any R rated track that is no higher in lug height than the original production tracks available for the model, as filed.
Tracks may be no longer than 133 inches
Tracks must be 15 inches wide production tracks or designated replacements. They may not be narrowed from production specs.
Tracks narrower than 15 inches may not be used even if available from the original equipment manufacturer.
Bulkhead and Tunnel
Bulkhead must remain in original orientation to the tunnel.
Chaincase, jackshaft and front drive axel placement must all remain OEM for the model
Front suspension mounting points within the bulkhead may be reinforced but not relocated.
Engine
Engine must remain OEM for the Brand and Model. One, two or three cylinders, 2 cycle only .
The following engine components may not be modified:
Cylinders, no porting allowed, overbore of .040 allowed
Heads
Crankshaft must retain original stroke
The following items are allowed for builder efficiency and affordability considering the age of the equipment utilized.
Crankshafts may be welded for repair.
Aftermarket rods and bearings may be used
Aftermarket wristpins and wristpin bearings may be used
Ignition must be OEM for the model.
Exhaust must be effectively silenced, but maybe modified or changed.
Carburetors and intake system must remain OEM for the engine and model.
The only allowable tuning components for the carburetors shall be OEM type jets, slides, needles, etc. No aftermarket enhancements allowed
Air boxes may be modified or removed.
Engine mounting plates must remain OEM, but the isolation devices (mounts) may be replaced
All belts, hoses, wire looms, cables, controls and gaskets may be replaced.
Brakes
Brakes must remain OEM for the model.
If a model has mechanical brakes, hydraulic replacement components are allowed but must be used in the original location at all points. (Master, Caliper, and Disc)
Clutches
Clutches both drive and driven must be OEM for the brand but may be replaced, or updated.
Aftermarket, springs, helixes, cams, arms, weights, bushings, etc may be used.
No additional machining to the clutch surfaces will be allowed. (Drive and Driven)
Ski's
Any legal ski may be used.
Sled must not be wider that 45 inches at the outside of the skis.
Traction
All traction and steering aids shall conform to general rules.
Hood, Belly Pan and Seat
The competitor is encouraged to retain the original appearance of the OEM model, color not withstanding. Replacements for hoods must be original type materials and not lightweight versions, even if original type material. Belly pans may be aftermarket replacements. Seats may be reupholstered but must be OEM for model. They may be contoured for comfort and safety. Side bolster pads may be added.
Bumpers
Bumpers may be removed, added, modified, or replaced.
Fuel tank
Fuel tanks must be in original position, and must be inspected for safety concerns. No leaks, improper line routing, or damaged tanks or caps will be allowed.
Fuel
114 max octane fuel allowed.
1 Lunger Mod/Fan: Any single cylinder fan cooled sled 1973 and older, NO FREE AIRS! NO REED MOTORS! Engine must match the chassis and year. Internal engine mods allowed, .060 max overbore, 340cc max. Any carbs, exhaust, clutches, ignition, chaincase. Any functional leaf spring ski allowed, no shorter than 12 inches. Stock spindle width plus 3 inch max ski spreaders. Any track and suspension. Cooling fan must be intact. Super Stock Classes: Any 1985 or older production leaf spring snowmobile. Engine, mount, exhaust, chaincase, and chassis must remain stock and in original positions. Original ignition systems (may use aftermarket cdi’s) stock carbs and airbox may be removed. Any size carbs. Must look like the original sled. Aluminum skis allowed (North Star) with up to 3 inch max ski spreaders (no trick skis) Internal engine mods allowed. .060 overbore max. Must start with OEM Rear Suspension. Any tracks allowed. Sled mods can be made for driver comfort only, handlebars, windshield, seat, fuel tank… Super Mod: 1985 or Older 45 Inch max ski width. Motor/Hood/Chassis brand do not need to match. Any motor mods allowed, .060 max overbore except in open. Any carbs, igniton, and exhaust. Any rear suspension and track. Any functional leaf spring skis. IFS X: Any 1985 or older IFS Chassis allowed. Must have SnoPro hoods. Any piston port engines allowed. Any modifications allowed. Any size carbs allowed. Any track and suspension. 503 Sprint: Production or hand built chassis. No exotics. Any engine modifications allowed. Engines up to 503cc Fan or Air cooled. Piston Ports only. Engine examples 488 Polaris, 500 Cat 5000, 503 Rotax. This class is for the older motor sleds. Must start with stock Y pipe. Any pipe allowed. Any hood, windshield, seat. Hood does not have to match chassis. Any front and rear suspension. Track cannot be any shorter than 112. Sprint Open: Any racing chassis allowed. Any engine modifications allowed. Any engine up to 500cc or 600cc Fan or Air cooled. Any Y pipe. Any pipe allowed. Any size carbs. Hood does not have to match chassis. Any front and rear suspension. Rubber or cleated track. Track can be any size. Pro Stock 500/600: Must start with any production 2 stroke snowmobile. Engine and exhaust are to remain completely stock. Seats may be modified. Track and suspension may be replaced, may use racing suspensions and tracks. Must use stock front suspension parts but my be modified. Any shocks. Racing skis allowed. Any handlebars. Stock gas tank. Footrests may be added. Lube systems may be added. Must use stock hoods and pans. Headlight does not need to light up. Champ 440: Any production or hand built chassis. Any chassis modifications allowed. 34mm round slide carbs. Any engine modifications allowed. 440cc twin liquid engines. Any size track. Champ Open 600: IF YOU HAVE ANY QUESTIONS ABOUT THE RULES CONTACT US!