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General Safety Rules
1.Any person in the staging and starting line area will be required to wear safety eye wear.
2.Sleds must be cleaned out in the designated warm up area only!!!!! This Area IS NOT at the Starting Line
3.Tethers have to be attached to the operator at anytime the sled is running.
4.Safety stands will be required when warming motors up in warm up area. The stand should be no more than 6 inches from the rear of the tunnel, and no more than 12 inches away from the track. Stand should be constructed from 6061T6 aluminum 1/8th inch or better. The side panel should extend to the center of the rear axle on the suspension. Vertical coverage must be no more than 1 inch off the ice and as high as the support on rear of sled. Stand should support sled at a safe height off of the ice.
5.Protective stands will be used at the starting line when sled is leaving the starting line.
6.Driver must have feet on running boards or foot pegs for the entire duration of the race.
7.Moving a running sled on a stand will not be allowed.
8.Crew may only be in starting area when your sled is racing.
9.All added weight must be bolted to the sled with at least 1 5/16 bolt with locking nut. Driver cannot wear weight belts or any weight adding device.
10.Driver must wear chest protection.
11.The race director or any tech personal can disqualify any one that does not follow safety rules.
General Sled Requirements
1.Any sled moving to a class other than the class for which it qualifies must meet the criteria and weight for that class. UNLESS OTHERWISE SPECIFIED
2.A variable ratio belt driven transmission must propel all sleds.
3.Clutch covers for Improved Stock and up, must be separate of cowl configuration and cover clutches down to center of clutch bolt or below. Must be .090 inch 6061 T6 aluminum or better and the outer perimeter be covered with 6 inch belting. If .125 aluminum is used, belting is recommended but not required.
4.Clutch covers for Heavy Mod & Open Mod Chassis Sleds must have full facial coverage and 360 degree elliptical coverage in the direction of the clutch or belt travel Cover must be .090-inch 6061T6 aluminum or better and be covered with 6inch belting. If cover fastens to the belly pan, the area bellow clutches must be covered with .090 inch 6061T6 aluminum or better. If cover is .125 inches thick belting is not required.
5.Dual limiter straps are required in all classes - on the front cross bar of the rear suspension.
6.All sleds must be equipped with stab wheels on the front of the slide rails to prevent rails from piercing track. ( Super Stock aka Improved Stock 600cc & UP)
7.No aftermarket Scudder boxes allowed below Prostock.
8.All tethers cords shall be attached to the drivers right wrist and not be any longer than 24 inches long when fully extended.
9.Cleated tracks will be allowed in Prostock, Heavy Mod & Open Mod, Heavy Mod Stock and Outlaw classes only, but must meet following conditions: The maximum CC limit for their use is 700cc Down Sleds. Classes above 700cc and its rubber tracks only. The rivet must be 1/4 inch in size and have a 5/8th inch head. Rivets must be solid no pop rivets will be accepted. Maximum of 6 traction points per cleat including points on any kicker plate device. You may only use hardened steel fasteners to secure kicker plates. The max. Amount of chisel or flat faced studs per cleat is 3 Max 2 traction points per kicker plate.3 cleat fasteners required in outer belting. Min of 4 and max of 6 fasteners in center belt. All open holes must be filled with a legal fastener. No grinding or welding will be allowed on cleats. 60% of track width must be belting. Cleat can be no farther than 6 inches apart.
10. Tracks cannot be run in the reverse direction.
11. Studs may not protrude no more than 3/4 of an inch above the highest point of the track lug or the highest point of the cleat.
12. On one piece rubber molded tracks: except for under slide rails, all plates will be no greater than 2 1/4 inches in length and width. Plates under slide rails may be no longer than 3 1/4 inch and no wider than 1 1/4 inch.
Protest Fees and Procedures
1. All protests against another racer are subject to a $100 (cash only ) protest fee.
2. Race Officials must deem the protest valid prior to accepting the protest fee.
3. Protester must specify exactly what the protest is about.
4. If protest is found to be valid, the protester fee will be returned.
5. Invalid protest, protester will forfeit fee & 50% will go to protested entrant and 50% to MRRSIDR
6. No protest will be accepted after 15 minutes of the completion of the class or event.
7. No protesting the races finish order or an Officials decisions unless an equipment malfunction occurs that may have affected the results. If a timing or lighting malfunction occurs or a Race Official mistake happens that affects the outcome of a race MRRSIDR reserves the right to rerun the race to determine the winner.
8. If a participant is disqualified for any reason MRRSIDR reserves the right to keep all entry fees associated with the class or classes the participant was disqualified from if this occurred after the race was run. A mistake of entering a wrong class by ignorance & {not deceit—( such as a hidden overbore) is not grounds for MRRSIDR to keep your entry fee. Any entry fees taken away by MRRSIDR will be distributed to the other entrant finalist winners in that class.
RACE DAY POLICY.
Registration Ends at 11:00 am. All Fees required to enter are in the form of Cash Only.
Mandatory Drivers meeting at 11.30 am by starting line.
Test Lane, one will be available the morning of the race up until 11.30 am but you must be registered and have signed a waver before you are allowed to use the track, period.
All our races are run on a four lane track.. In heat races if four go down, the first two come back and advance to the next round. If three go down, 2 come back. In all CASH payback class finals each participant must go directly to the scales to be validated. Failure to do so is a disqualification and forfeiture of all your portion of the funds in that class to the other finalist. If you are caught off weight by much then your disqualified and the other racer finalist in that class will receive your portion of the payback. Please don’t play games with this as its not in the spirit of what were trying to accomplish here.
PAY BACKS
Stock Appearing, Trail Stock, Unstudded, and Kitty Cat will run for Trophies or Plaques only.
If the winner of a Cash Class wants a Trophy or Plaque, we will accommodate for $15 if we have a Trophy or Plaque available.
All other classes will run for cash on a 100% pay back format.
Cash Pay Back Format
We will pay back a maximum of 4 places.
We will pay back 4 places in a field of 13 or more-----1st 45% 2nd 25% 3rd 20% 4th 10%
We will pay back 3 places in a field of 12 to 8-------1st 50% 2nd 30% 3rd 20%
We will pay back 2 places in a field of 7 to 4------------1st 65% 2nd 35%
We will pay back 1 place in a field of 3 or less----------1st 100%
FOUR STROKE SNOWMOBILES
1. All stock 4 Stroke snowmobiles will compete in the same classes as they do per IS 2005, with the exception being the Yamaha RX1 and Apex 1000. These will be considered a 700 Improved Stock when entering Improved Stock. All 4 Stroke classifications can be viewed as experimental and MRRSIDR may change what runs in what class on a weekly basis until we find a fair competitive balance.
2. All 4 Stroke Factory Turbo Sleds that are modified beyond the stock rules will at this point only compete against each other unless otherwise specified in anything other than Trail Stock.. We hope as we gain information on the capabilities of these sleds to be able to blend them in with other two stroke sleds. 10-1-05
STOCK APPEARING CLASS RACE STUDS ONLY.
1984 and Newer sleds. Sled & Driver do not have to meet any minimum wt in any of these classes
Classes
500 -600-700-800 & Open Stock Appearing
General Rules
1.Snowmobiles must have original OEM for the model engine, hood, skis, frame, gas tank, cowl, carburetion, air box, suspension, clutches, supplied by the manufacturer for that model.
EXTRA AIR BOX VENTS ALLOWED &/OR A POWER BREATHER COVER
2.All sleds must conform to general sled section above.
3.Ski width must remain OEM for that model.
4.Max cylinder overbore for wear cannot exceed .020 inches.
5.A max of one venturi per cylinder will be allowed.
6.OEM carburetors and components
7.Sleds equipped with EFI may replace the non adjustable fuel regulator with any commercially available, mechanically adjustable fuel pressure regulator. The regulator and mechanical adjustment device must be installed under the hood and not be accessible to the driver while sitting on the seat. No electronic regulator will be allowed.
8.Fuel pumps must remain OEM and you cannot add additional pumps.
9.Oil injection systems must remain operational, but lines my be plugged and premixed gas used.
10.Cooling systems must remain stock and functional. Quick disconnects are the only modification allowed.
11. Harmonic balancers must remain intact.
12. Exhaust systems PIPES must remain OEM for that model. Aftermarket Exhaust Canisters are allowed
13. Torque Arms Allowed
Drive Systems
1.Any combination of springs or weights may be used.
2.Metal may be removed from flyweights but may not be added to.
3.Any drive belt may be used.
4.Any drive chain and sprockets may be used, provided they are at least as strong as stock.
Skis & Suspensions
1.Shocks must remain OEM and may not be relocated to a different location.
2.Must maintain 2 inches of remaining travel with driver on the sled.
3.Sleds equipped with mountain style handlebars may replace them with any OEM handlebar within the same brand.
4.Aftermarket skis are allowed if commercially available to the public. Min length is 40 inches. Skis may not be changed between brands. Replacement skis must be of same material as OEM ski for that model. Example. Plastic to plastic or steel to steel.
5.Skis may be reinforced on the upper surface only.
6.Complete OEM rear suspensions must be used as filed by the manufacturer. There will be no options permitted. Suspension may be located anywhere in the tunnel where the manufacturer has drilled mounting holes. Pre drilled plates may be drilled out to facilitate suspension adjustment. Holes may not be enlarged or slotted.
7.Marginal snow wheels and related hardware may be added or removed from slide rails. Structural integrity must be maintained.
8.Rear axle idler wheels must remain OEM for that model.
9.Shocks must remain OEM for that model and remain in the OEM location. On rebuild able shocks, spacers may be added internally to limit rebound travel, but not compression travel.
Tracks
1.Minimum lug height from the flat part of the track is 1/2 inch. Track must be OEM for model or designated ISR replacement race track.
2.Track clips and guides may be replaced when showing signs of wear. Guide clips can be replaced with track clips and vice versa.
Chassis & Body
1.There will be no alterations that change the stock appearance of the sled.
2.Tunnel may be repaired, but the length must stay the same for that model.
3.Windshields may be removed.
4.Headlight assembly may be removed, but opening must be closed off. This does not include the headlight console.
Electrical & Ignition.
1.Ignition must remain OEM for that model and year.
2.CDI may be reprogrammed.
3.Fixed ignitions may be moved 4 degrees + or _.
4.You may remove speedometers, Tachs or heat gauges if openings are closed off.
SUPER STOCK/ (AKA IMP STOCK) ---- RACE STUDS ONLY. NO MODIFIED TURBO SLEDS
Classes
500 -600-700-800-1000 & Improved Open
General rules
1.Machine movement will be from Stock to Super Stock.(1984 or newer.) However Vintage Sleds can jump in if they meet weight requirements and qualify in our vintage format rules.
2.Minimum combined weight of sled and driver is as follows: (TRIPLES)-500cc =650lbs.
600cc = 700lbs. 700cc = 750lbs, 800 & 1000cc = 775lbs. (All TWINS) Deduct 50lbs
3.Super Stock sleds may advance to a higher cc class and not be required to meet the min weight for that class. However they must meet the minimum wt of the class they are jumping from. This applies to Super Stock classes only, not Pro Stock.
4.Any alterations in stock class are allowed in Super Stock class.
5.The engine, frame, suspension, seat, fuel tank, must remain OEM for that year and model.
Engine
1.Engine and its components must remain OEM for that model. Engine may be modified internally, but must maintain its stock appearance on the outside. Serial numbers and part numbers must all so remain.
2.Cylinders must remain OEM for that model. No visible external changes are allowed. The number of cylinders must remain the same for that model.
3.Engine may be bored up to its class limit. A one percent overbore is permitted.
4.Crankshaft and case must remain OEM
5.Cylinder heads mat be modified internally or machined for inserts, but must maintain stock appearance on the outside. Spark plug must remain in same location.
6.Carburetors, flanges and intake may be modified internally. But must maintain same concept and location.
7.Additional fuel delivery systems will not be allowed.
8.Air box may be removed or altered.
9.Oil pumps may be removed. Oil tanks may be removed. Oil injectors may be removed.
10. Engine flywheels must remain.
11. Torque arms may be added.
12.Rigid motor mounts are allowed, but OEM motor location must remain the same for that model.
13.Cooling system must remain operational, but may be altered or parts removed. Disconnects may be added.
14.Any functional silenced exhaust is allowed. It is recommended that the dB level (measured 75 feet down the track, 50 feet from the track at full throttle . 108dB in the winter.
Drive systems
1.Any primary and secondary clutch may be used including roller style clutches.
2.There is no RPM engagement limit in this class.
3.Jackshafts of like material can be changed to accommodate clutch changes. OEM location must stay the same.
4.Any track drive sprockets and non driving wheels allowed on the track drive axle. There can be no changes allowed in the drive, frame, or suspension to accept track drive sprockets.
5.Track drive axle and chain case must remain OEM for that model and maintain same location.
Skis & Suspension.
1.Ski suspension and shocks must remain OEM and maintain same location.
2.Max width is 45 inches. Stock sleds must be narrowed if competing in Improved stock classes.
3.Ski widening devices may be used if they do not lighten or change configuration.
4.Must have 2 inches of compression travel with driver on the sled.
5.Stock OEM shocks for that model only.
6.Shocks must remain in OEM location.
Tracks
1.Any commercially available one piece rubber track is allowed. Unless specified, no modifications can be made to the frame, drivers, or suspension to install
2.Min. rib height of track is ½ inch.
3.Cleated tracks are allowed on stock qualified sleds that came OEM with a cleated track. OEM cleats only. Cleat rivets must be 3/8 inch.
4.Machine must maintain 20 inches of track length on the course surface when under full power.
Ignition
1.Sled must maintain stock OEM ignition for that model Except in SS 1000 which can run aftermarket ignition
2.Fixed ignitions may be moved four degrees either way.
3.Pony pac ignition systems may be installed on four cylinder Yamaha to change the firing order to 180 degrees.
4.Sleds may remove or add tachs, speedometers, and heat gauges. Electrical wires, harnesses and drive cables may be removed.
Chassis
1.Any chassis alterations that alter stock appearance or dimensions will not be allowed. Damaged tunnels may be repaired but must maintain OEM length and shape.
2.Must use OEM fuel tank for fuel supply.
3.You cannot remove any insulation that alters the outside stock appearance.
Super Stock 1000 class
1.Min weight sled and driver is 775 pounds with a Triple . Twin is 725lbs
2.Any stock qualified model may be used and the engine may be bored up to that class limit with a one percent overbore which allows up to 1010cc’s
3.Rod centers on the stroke may be changed.
4.Crankshafts may be modified.
5.All aftermarket cylinders are allowed that are commercially available to the public. The out side of the cylinders may not be modified. There can be no welding on the crankcase.
6.OEM cylinders must remain .020 inches per side or .040 overall the stock OEM outer shell dimensions. No interchanging cylinders between brands.
7.Any Head that is commercially available to the public is allowed.
8.Intake concept must remain the same for that model. No external modifications allowed.
9.Air boxes may be removed.
10. Carburetor flanges or boots may be changed.
11. You may add additional OEM fuel pumps.
PRO STOCK RACE STUDS ONLY. NO TURBO SLEDS ALLOWED
Classes and weights
500cc ---------------------------550lbs. 500cc can jump to 600cc and up at 520lbs
600,700,800cc Triples---------600lbs (all 600cc to 800cc Twins-- 575lbs)
1000cc------------------------- 625lbs.
General
1.Pro stock sleds must remain OEM in appearance and dimension for that model. Like chassis may be interchanged within brand. Material substitution is allowed as long as original OEM dimensions stay the same. We allow you to put a 2 or 3 Cylinder motor in 2 Cylinder Chassis, provided motor/chassis stay the same brand. If your moving a 3 cly motor into a 2 cly chassis it must be to a newer model chassis than the motor age. We would prefer that it is a current style sled chassis in appearance and again it has to be same brand motor/chassis.
2.Sled must begin as a stock qualified snowmobile. No Turbo Sleds allowed
3.Any alterations allowed in stock classes are also allowed.
4.Race director has the authority to determine structural integrity of any sled.
1.The engine may be moved a max of 1 inch from its OEM location. The crankshaft cannot be moved within the case. The Drive Axel/Jackshaft may be moved 2 inches in total to accommodate clearance
2.Crankcase, cylinders, and crankshafts must be from the same model. They may be modified internally and retain there outside stock OEM appearance and dimensions. Number of cylinders must remain the same for that make and model. Cranks Can Be Stroked.
3.Four cylinder crankshaft gears may be replaced with any OEM gears.
4.Cylinder overbore is limited to 2% over class size. Exp. Sleds running in the 500cc class can have a displacement of 510cc. 800class can have 816cc. Outer cylinder modifications must remain within .020inches per side, .040 overall on the outside shell original OEM dimensions.
5.Base plates can be used to raise cylinder height but cannot exceed ½ inch including base gaskets.
6.Intake concept and location must remain OEM for that model. A maximum of one venturi per cylinder is allowed.
7.Air boxes are not required.
8.Dual spark plugs are allowed as long as stock appearance is not changed.
9.Engine cooling systems must remain the same but may be modified. Water pumps may be removed.
10.Radiators and ducting may be altered but must not change OEM appearance. Radiators must not protrude beyond the bellypan and must be within 1/4 inch of the bellypan. Max opening in bellypan cannot exceed 100 square inches.
11.Any silenced exhaust system may be used.
12. Motor mounts or plates may be modified or reinforced
13. Torque arms are allowed.
14.Aftermarket carburetors are allowed as long as they are commercially available to the public.
15.Reeds and reed blocks may be changed as long as they do not change the outside dimensions of the cylinder or crankcase. Pro stock 1000 reed cages may be modified. Reed cages must be bolted on, no welding allowed.
16. Additional fuel pumps may be added.
Drive system
1.Any aftermarket clutch is allowed.
2 The Jackshaft and track drive axle may be moved one inch in any direction from their original OEM location.
3.Jackshafts and drive axle may be changed or modified. Titanium shafts are allowed.
Skis and Suspensions
1.Front suspension components must remain in the OEM location and have the same OEM design.
2.Shocks may be changed but must remain in same location.
3.Spindles may be replaced with stronger material but must remain within 10% of their original OEM dimensions.
4.Min. ski stance is 40.inches and the max is 45 inches.
5.Front and rear suspension must have a min. of 1 inch of compressed travel with driver on sled.
6.Any aftermarket ski is allowed as long as it is 20 inches in length and has a loop in the front that prohibits ski from interfering with other parts of the sled.
7.Any aftermarket rear suspension and shock is accepted.
8.Any track is allowed as long as it remains in the tunnel area. Sled must maintain 20 lineal inches of track on the coarse surface when under full power. Over 700cc must use rubber track.
9.Track lugs may be trimmed as long as the structural integrity of the track is not compromised.
10. All cleated tracks must comply with rules in general section.
Chassis
1.Bulkheads must remain OEM in appearance and dimension but may be made of different material such as aluminum or titanium.
2.Chassis reinforcements are allowed.
3.Sleds will be required to have a sheet of metal the same thickness as the tunnel permanently fastened to the topside of the tunnel. Starting from the rear of the tunnel all the way to the bulkhead area and reach both sides of the tunnel.
4.Hood and belly pan moldings must remain in place and cannot be drilled on for lightening purposes.
5.All insulation can be removed from the underside of the hood.
6.Seat must remain OEM appearing but may be lighten in weight.
7.Fuel tanks my be modified as long as the shape of the sled is not altered
8.Front air dams must have a minimum of 2_inch clearance with the suspension fully compressed.
Ignition
1.All aftermarket ignitions are legal including the MSD brand.
2.All gauges may be added or removed.
3.Electrical wiring may be altered or removed.
Pro Stock 1000 class – Per ISR
1.Any commercially available aftermarket cylinder is allowed.
2.Cylinders must remain a like brand.
3.Cylinders must be bolted on, no welding accepted.
HEAVY MOD RACE STUDS ONLY. NO TURBO SLEDS
Classes 440cc-500cc-600cc-700cc-800cc-1000cc
Weights ------------All weight listed are a combined weight of sled and driver.
1.
440cc 500lbs
440cc jumping into 500cc class 500lbs
440cc jumping into 600 cc 480lbs
440cc jumping into 700cc or above 400lbs
2.
500cc 500lbs
500cc jumping into 600cc 500lbs
500cc jumping into 700cc or above 410lbs
3.
600cc 550lbs
600cc jumping into 700cc 525 lbs
600cc jumping into 800cc or up 480lbs
4.
700cc 550lbs
5.
800cc.550lbs
6.
1000cc 550lbs
Engine
1.All engines must be manufactured for snowmobiles only. Out board and motorcycle engines are not allowed.
2.Maximum cylinder overbore for 440, 500, 600 700 and 800 classes will be 2% over the cc limit for that class.
3.Maximum overbore for the 1000cc class will be 5% over the cc limit for that class.
4.Turbo charging, or super charging will not be allowed nor will aftermarket fuel injection
5.Any exhaust systems are allowed and must point rearward and downward. The end of pipe must extend beyond front cross member/spindle centerline.
6.Silencers are required.
7.No Titanium Rods Allowed in 600cc and down classes.
Ignition
1. No Aftermarket ignition allowed in 600cc classes and down. Any factory supplied ingition is acceptable.
Skis and Suspensions
1.Front and rear suspension must maintain at least 1 inch of travel with driver on sled.
2.Maximum width is 45 inches.
3.Ski must have a loop and must not interfere with other parts of the sled. Loop must go under front of ski
4.Sled must maintain 20 linear inches of track on coarse surface when sled is under full power.
5.Any aftermarket suspension is allowed.
Chassis and Drive System
1.All caliper braking systems must be mounted on drive axle.
2.In 800 & 1000 class brake disc must be a minimum of 3/16 inch thick and have a diameter of no less than 6 inches. Calipers must be a twin opposed piston caliper.
3.Aluminum discs will not be allowed.
4.Brake disc may be drilled as long as pad area is not reduced any more than 15%.
5.A sheet of metal must be permanently fastened to the top of the tunnel if existing tunnel material is less than 1/8inch thick. This sheet must be the same thickness as existing material and extend from rear of sled to bulk head area. Also must cover from side to side.
6.Hoods must have a total of 1300 square inches on outer surface
OPEN MOD RACE STUDS ONLY. NO TURBO SLEDS
Classes 440cc-500cc-600cc-700cc-800cc-1000cc Open Mod 1000 will be known as TOP GAS 1000
General
1.Minimum sled weight with driver
440cc--------------- 430 lbs
440cc jumping into 500cc open 430lbs
440 jumping above 500cc open class at any wt
500cc---------------_430 lbs
500cc ---------------In 600cc class or above at any wt
600cc and larger Mods the Wt rule is just a minimum sled wt of 250lbs no driver wt is considered
2.This class is open to any production or custom made sled. Sled length should not exceed 144 inches.
3.Race director has the authority to determine structural integrity and safety.
Engine
1.All engines must be a snowmobile production motors. No motorcycle motors allowed.
2.Maximum overbore in 440, 500, 600, 700, & 800 classes is 2% over class cc size. 1000cc class will be 5% overbore.
3.All fuel injection systems are allowed above 600cc
4.No turbo or superchargers allowed.
5.Exhaust systems must point rearward and downward. The end of the pipe must be beyond the cross member/spindle centerline. Silencers are required
6. No Titanium Rods allowed in 600cc and down classes
7. No aftermarket ignitions allowed in 600cc & down. Any factory supplied ignition is acceptable.
Skis and suspensions
1.Front and rear suspension must maintain at least 1 inch of travel with driver on sled.
2.Maximum width is 45 inches.
3.Ski must have a loop and must not interfere with other parts of the sled.
4.Sled must maintain 20 linear inches of track on coarse surface when sled is under full power.
5.Any aftermarket suspension is allowed.
Chassis and Drive System
1.All caliper braking systems must be mounted on drive axle.
2.In 800 & 1000 class brake disc must be a minimum of 3/16 inch thick and have a diameter of no less than 6 inches. Calipers must be a twin opposed piston caliper.
3.Aluminum discs will not be allowed.
4.Brake disc may be drilled as long as pad area is not reduced any more than 15%.
5.A sheet of metal must be permanently fastened to the top of the tunnel if existing tunnel material is less than 1/8inch thick. This sheet must be the same thickness as existing material and extend from rear of sled to bulk head area. Also must cover from side to side.
OPEN FUEL— Same Rules Found in PS 1000 or MOD 1000
Any Mod or PS CHASSIS allowed.
Turbo 4 Stroke SLEDS UP TO 1000cc ,
NOS 2 Stroke Sleds up to 1000cc,
Naturally aspirated 2 strokes up to 1500cc on race gas
VINTAGE IMPROVED STOCK CLASS RULES AND GUIDELINES
Vintage Classes (1981 and older Snowmobiles ) RACE STUDS ONLY
NO 1975 & NEWER IFS SLEDS ALLOWED IN VINTAGE
Vintage A
ANY Liquid sleds up to 440cc (Except the following 440cc sleds 1976 or 77 SRX , 1977 Blizzard, 1977- Arctic Z)
Any original Equipped free air sleds up to 500cc
Vintage AA
Any of the above + the 1976-77 SRX , 1977- Blizzard , 1977- Arctic Z
Any Original Free Air Up to 500cc
Vintage Open Any of the above Vintage A or AA sleds can jump into vintage open. Vintage Open also allows any sled to use 40mm Round Slide McCunnie Carb bodies as the Starting point for modification
Vintage Heavy
Vintage Heavy will consist of sleds qualified to compete in one of the above 3 classes. What differs wil Vintage Heavy is that sled and driver will be weighed and must meet minimum weights to race. The various weights will depend on the classification of the sled entering. We are still working out the details/weights for 2008, but in a nutshell this class will be one where the driver or driveer plus ballast will exceeed 200;bs. Details coming soon.
1.No limited build or race only models in any vintage classes unless their free air
2.All sleds must comply with general safety rule, Vintage sleds are exempt from the restrictions on cleated tracks. provided they came with a cleated track
Carburetion
1. OEM type carburetor ( must start with origional size carb body)& may be modified( VINTAGE - A & AA ) ( see rule for Vintage Open)
2. Modified Air Box(OEM for Model) or Filters allowed but must have one or the other
Motor
1.Must be original equipment for the make and model of sled.
2.OEM or after market pistons are allowed.
3.Cylinder overbore for wear cannot exceed .030 inches.
4.Oil injection pump may be removed.
5.Aftermarket silenced exhaust allowed
1. Any OEM type primary or secondary clutch is allowed.
2. Must have full metal clutch guard and safety belting on top side. Clutch guard does not have to be a stock unit. We encourage you to build a Stronger/Safe and more Enclosed unit than stock.
3. Material substitution or lightening of any drive component is not allowed.
4. Brakes must be functional.
5. Motor Can Be internally Ported & Head/ Cyl Hold Down Kits allowed
Skis
1.Any metal ski at least 30 inches in length is allowed.
1.Any 1980 or older OEM suspension is allowed but tunnel cannot be altered dimensionally.
2.Any OEM track is allowed.
3.Maximum of 6 studs/picks per cleat
4.No slide lube allowed.
5.Additional idler wheels may be added
6.Must have attached snow flap that is a maximum of one inch above ice with driver seated.
Frame and Body
1.No alterations, material substitutions, lightening, or additions to OEM frame or body allowed.
2.Hood insulation may be removed.
3.Windshield may be removed or trimmed.
4.Measures taken to strengthen these components are allowed
5.Sled must be vintage in appearance. Reasonable alterations to hood to facilitate cooling are allowed.
6. Torque Arms and solid motor mounts are allowed
Electrical
1.Headlight may be removed.
2.Must use the production Stator, Primary coil & 2ndary coils, however updated brain boxes allowed
Final Note. What you're sort of running is the equilevant of the modern small cc sled Improved Stock rules. So use that as an example of how far you can push issues. However, you are using vintage parts and vintage technology for the most part. We understand these sleds. So if you fell the need to do minor structural strengthening of things like reinforcing a pillow block etc, then this is fine. Just watch it. We do encourage you to build a much stronger and safer belt cover/sheild system than stock. One that incorporates a full sheild between the clutches and the motor and also extends to the outside edges of the center bolts on both the drive and driven clutches. In any event, Full coverage Clutch safety blowout belting is manditory on the top side of all clutch cover sheilding without exception.
HEAVY MOD STOCK 1 & 2-- RACE STUDS ONLY.-- NO TURBO SLEDS ALLOWED
The purpose of Heavy Mod Stock is to allow Crew members who are larger to compete in a class that gives them an opportunity to run against like competition at a weight that is obtainable. In some cases we have thrown in some lighter sleds & drivers to make the class larger but keep ets in the ballpark of the rest of the field. This is an experiment for 2006 & we reserve the right to change weights or sleds on a weekly basis in the hopes of fair level competition. Please note the 1000 PS in HMS 2 is designed for the lake racer that might enter this class. The other part of the overall goal of this class is to allow a race team more opportunity to race the same sled on a given day
HEAVY MOD STOCK 1. (WE FEEL THIS IS A 6.4 ET RANGE CLASS )
PS 500 @ 550lbs
PS 600 @ 625
Super Stock 700Twin @ 650lbs
Super Stock 700 TPL @ 675lbs
PS 700 @ 675 lbs
600 Mod @ 625lbs
STOCK APPEARING 1000 @ 650lbs
HEAVY MOD STOCK 2 ( WE FEEL THIS IS A 6.1 ET RANGE CLASS)
PS 700 @ 625lbs
Super Stock 800 TWIN OR TPL @ 650lbs
Super Stock 1000 @ 800lbs
PS 1000 at 700LBS must have 121" TRACK & OEM CLY
Super Stock 900 TWIN @ 675
Super Stock 900 TRIPLE @ 700 LBS
OUTLAW CLASSES–--RACE STUDS ONLY
Outlaw 1 ------PS 500 at 550lbs, 440 Mod at 525lbs, Super Stock 700cc @ 750 lbs
Outlaw 2-------PS 700 at 600lbs, 440 & 500 Open Mods at any wt, Heavy Mod 600 at 600lbs, & 900cc Super Stocks & down
Outlaw 3-------PS 800 TRIPLES at 600lbs, PS 800 TWINS at 575 Lbs 700 Heavy Mods 1000cc Super Stocks, Turbo 4 Stroke Super Stock chassis/skid type sleds up to1000cc
Super Stock Sleds W/Nos 800cc @ 775 lbs & down 440cc & 500cc Twin Open Mods on NOS
Outlaw 4-------RUN what you brung , Any cc , any and all power adders like, NOS, Turbo, What Ever !!!!!!
FACTORY MOD 2 RACE STUDS ONLY
PS 1000 @ 650lbs vs PS 800 @ 575 LBS
TRAIL APPEARING (A.K.A. TRAIL SLED ) TRAIL STUDS ONLY. NO CHISSEL STUDS PERIOD....EVEN IF THEIR TRAIL CHISSELS STUDS THEY ARE NOT ALLOWED.
THESE SLEDS WILL NOT BE WEIGHTED IN ORDER TO COMPETE
A factory produced Stock Turbo sled can run in its cc class. However a MODIFIED TURBO SLED OR A AFTERMARKET TURBO/SUPERCHARGED/OR NOS EQUIPPED SLED WILL RUN IN 801cc to Open cc class.
1 Any M/L Trailable factory produced and appearing Trail Sled Allowed.
2 Aftermarket pipes, reeds, head, porting, carb boring, Turbo , etc are allowed.
3 These Are Trail Rideable Sleds ( TRAIL SLEDS ) with Stock Suspension, Trail Type Tracks, Trail Type Skies, Full Cooling system intact and no external cool down devices . Working Head and Tail Lights etc. These Sleds are not lowered or chained down in any manner from how they would run on the trail. The only suspension modification allowed would be to tighten down the front limiter strap on the front part of the skid using the stock strap with no extra holes drilled in it.
4. They can be Vintage or Newer
Classes
Trail Sled 580cc and Down
Trail Sled 601cc to 800cc
Trail Sled 801cc to Open cc
FINAL RULES NOTE.
SAFETY IS OUR # 1 CONCERN AT THESE EVENTS
1. THE ONLY PLACE YOU CAN SPIN THE TRACK IS IN THE DESIGNATED BLOW OUT AREA.
2. YOU CANNOT SPIN THE TRACK IN THE PITS OR AT THE STARTING LINE EVER !!
3. THE SLED CAN ONLY BE LIFTED WHEN SPINNING THE TRACK BY AN APPROVED REINFORCED SLED SHIELD THAT LIFTS THE TRACK OFF THE GROUND.
4.ABSOLUITELY NO PERSON CAN BE HOLDING THE TRACK OFF THE GROUND WHEN DOING THIS AT ANY TIME !!!!!!!!!!!!!
CLEATED TRACKS WILL NOT BE ALLOWED AFTER THE END OF THE 2007 WINTER ICE SEASON IN ANYTHING LARGER THAN --- 700CC PROSTOCK OR MOD/HEAVY MOD AT ANY MRRSIDR RACE SERIES SANCTIONED TRACK EVENT.
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