VolsRacing.Com

2007 - 2008 Individual Class Rules

1970 and Older HR Class

1. Must be a production Line Model.  Fan cooled chassis, 1970 or before.  No limited models.  Must have single cylinder.
2. Must be a single cylinder fan cooled motor and it must have points made in 1970 or before.  Artic Cats must run (150A) motor, no (150B).  Artic Cat - Panther chassis only.
3. No performance options or kits.
4. Clutch - can use 94 Comet Duster/ Power Bloc or original.
5. Carburetor - can run HR Tillotson or WR Walbro or HR Keihin - No Mikunis or Reed Valves allowed.
6. Exhaust/Muffler should be original - or close to original baffled muffler - (no tuner and no pipe). No cutting or adding to outlet.
7. MOTOR - No increasing the size of any openings, intake, internal or exhaust (no porting).
8. MOTOR - Normal oversize boring allowed with only normal required port chamfering, normal oversize boring up to .060 overbore maximum.
9. MOTOR - Pistons should be originals or stock replacements (no modifications which will increase compression or change port or skirt performance).
10. MOTOR - Cylinder Heads must be original (not shaved).
11. MOTOR - Crankcase and crank must  be original.
12. CHASSIS - Chain case - must be from original manufacturer, 1970 or older - includes secondary clutch.
13. CHASSIS - Fuel tank - original or replacement must be of same size.
14. Any other questions refer to the Genera/Safety Rules or e-mail us.

 1973 and Older Experimental Class

1. Must be a production line model.  Fan cooled chassis, 1973 or before.  No limited models.  Must have come with one of the motors below - stock - and sold to the public as is.  (Remember must have come with single cylinder motor.  Examples:  (Artic Cat - Panthers only) Ski Doo - Olympiques, Elans - Skiroule - RT-300 & S-250, Scorpion - Mark II or Stinger 1, Rupp Sprint 29 or S-29, Polaris Colt or Charger, Northway GO-45 or GO-30, Moto Ski - Cadet or Capri, and many more.  Please look in INTERTEC Snowmobile 11th Edition if you have any questions.  Motors allowed:  250 Polaris; Rotax 247, 300, 302, 320, 335; K-295-1 Kohler; L-295, 297, 300 JLO; 280 and 293 Sachs; 55R, 190, 191, 193R Hirth                                                                  
2. Must be a single cylinder fan cooled motor and have points made in 1973 or before.
3. No performance options.
4. Clutch - can use 94 Comet Duster/Power bloc or original.
5. Carburetor - can run HR Tillotson or WR Walbro - No carb boring or Reed Valves allowed.  No Mikunis carburetors allowed with the exception of the 250 Polaris single.  Can remove choke.
6. Exhaust/Muffler should be original - or close to original baffled muffler - (no tuner and no pipe.)  No cutting or adding to outlet. 
7. MOTOR - No increasing the size of any openings, intake, internal or exhaust (no porting).
8. MOTOR - Normal oversize boring allowed with only normal required port chamfering, normal oversize boring up to .060 overbore maximum. 
9. MOTOR - Pistons should be originals or stock replacements (no modifications which will increase compression or change port or skirt performance).
10. MOTOR - Cylinder Heads must be original (not shaved).
11. MOTOR - Crankcase and crank must be original - Yamaha can have a tapered crankcase.
12. CHASSIS - Chain case - must be from original manufacturer, 1973 or older - includes secondary clutch.
13. CHASSIS - Fuel tank - original or replacement must be of same size.
14. Any other questions refer to the General/Safety Rules or e-mail us.

1973 and Older HR-1 Class

1. Must be a production Line Model.  Fan cooled chassis, 1973 or before.  No limited models.  Must have single cylinder motor.  If you have a 1973 or older sled with a twin cylinder you may put a single cylinder in it.
2. Must be a single cylinder fan cooled motor and it must have points made in 1973 or before.
3. 150A motors only.
4. No performance options.
5. Clutch - can use 94 Comet Duster/Power Bloc or original.
6. Carburetor - can run HR Tillotson or WR Walbro, Mikuni BN 34, Keihin CD 38-32.  Polaris can run a Mikuni Slide Carburetor.  Can remove choke assembly.  No carburetor boring or reed valves allowed.
7. Exhaust/Muffler should be original - or close to original baffled muffler - (no tuner or no pipe).  No cutting or adding to outlet.
8. MOTOR - No increasing the size of any openings, intake, internal or exhaust (no porting).
9. MOTOR - Normal oversize boring allowed with only normal required port chamfering, normal oversize boring up to .060 overbore maximum.
10. MOTOR - Pistons should be originals or stock replacements (no modifications which will increase compression or change port or skirt performance).
11. MOTOR - Cylinder Heads must be original (not shaved).
12. MOTOR - Crankcase and crank must be original - Yamaha can have a tapered crankcase.
13. CHASSIS - Chain case - must be from original manufacturer, 1973 or older - includes secondary clutch.
14. CHASSIS - Fuel tank - original or replacement must be of same size.
15. Any other questions refer to the General/Safety Rules or e-mail us.

1973 and Older 0 - 375 cc HD

1. Must be a production Line Model.  Fan cooled chassis, 1973 or before.  No limited models.  Must have single cylinder motor.  If you have a 1973 or older sled with a twin cylinder you may put a single cylinder in it.
2. Must be a single cylinder fan cooled motor and it must have points made in 1973 or before.
3. Artic Cat Pumas and Lynx snowmobiles can run any single cylinder motor except the sachs wankel (example: Sachs, Hirth, JLO, KAW or Kohler).
4. No performance options.
5. Clutch - can use 94 Comet Duster/Power Bloc, or original.
6. Carburetor - can run any HD-HR Tillotson or any WD-WR Walbro or any Keihin (406 which is roughly equivalent in size to a Tillotson HR or 407 which is equivalent to a Tillotson HD, or CD followed by numbers such as 33-28; the first number is the bore - the second is the venturi diameter).  (Example:  292 GP Yamaha would run a CD 42-38 Keihin carburetor).  No carburetor boring or Reed Valves allowed.  No Mikuni carburetors allowed with the exception of the 250 Polaris single.  Can remove choke.
7. Exhaust/Muffler should be original - or close to original baffled muffler - (no tuner and no pipe).  No cutting or adding to outlet.
8. MOTOR - No increasing the size of any openings, intake, internal or exhaust (no porting).
9. MOTOR - Normal oversize boring allowed with only normal required port chamfering, normal oversize boring up to .060 overbore maximum.  No boring a 290 ss sachs to a 340 sachs c.  This includes resleeving.
10. MOTOR - Pistons should be originals or stock replacements (no modifications which will increase compression or change port or skirt performance).
11. MOTOR - Cylinder Heads must be original (not shaved).
12. MOTOR - Crankcase and crank must be original - Yamaha can have a tapered crankcase.
13. CHASSIS - Chain case - must be from original manufacturer, 1973 or older - includes secondary clutch.
14. CHASSIS - Fuel tank - original or replacement must be of same size.
15. Any further questions refer to the General/Safety Rules or e-mail us.

1973 and Older HR/RD Class

1. Must be a Production Line Model.  Fan cooled chassis, 1973 or before.  No limited models.  Must have single cylinder motor.  If you have a 1973 or older sled with a twin cylinder you may put a single cylinder in it.
2. Must be a single cylinder fan cooled motor and it must have points made in 1973 or before.
3. Artic Cat Pumas and Lynx snowmobiles can run any single cylinder motor except the sachs wankel (example:  Sachs, Hirth, JLO, KAW or Kohler).
4. No performance options.
5. CLUTCH - can use 94 Comet Duster/Power Bloc or original.
6. CARBURETOR - Artic Cat Kawaski 150A or 150 B must run an HR carburetor in this class.  The following motors can run with an HD carburetor:  Sachs - 293, 297, SA 340, SA 368; Rotax - 292, 300, 302, 320, 335; JLO - L300, L340, L372, L380, L395; Kohler - K2951T, K309-1, K335-1; Yamaha - SL 292.  HR to HD Adapter allowed.  HD carburetor must be at 41mm maximum diameter.  Polaris can run a Mikuni slide carburetor.
7. EXHAUST/MUFFLER - should original or close to original baffled muffler - (no tuner and no pipe).  No cutting or adding to outlet.
8. MOTOR - No increasing the size of any openings, intake, internal or exhaust (no porting).
9. MOTOR - Normal oversize boring allowed with only normal required port chamfering, normal oversize boring up to .060 overbore maximum. 
10. MOTOR - Pistons should be originals or stock replacements (no modifications which will increase compression or change port or skirt performance).
11. MOTOR - Cylinder Heads must be original (not shaved).
12. MOTOR - Crankcase and crank must be original - Yamaha can have a tapered crankcase.
13. CHASSIS - Chain case must be from original manufacturer, 1973 or before - includes secondary clutch.
14. Any further questions refer to the General/Safety Rules or e-mail us

1973 and Older 0 - 400 Super Stock Class

1. Must be Production Line Model.  Fan cooled chassis 1973 or before.  No limited models.  Must have a single cylinder motor.  If you have a 1973 or older sled with a twin cylinder you may use this chassis.
2. Must be a single cylinder fan cooled motor and it must have points made in 1973 or before.
3. MOTORS ALLOWED - Sachs 290c, 320, 340c, 400 and Sachs Wankel and all other motors.
4. PRIMARY CLUTCH - original or any after market clutch.
5. CARBURETOR - Any production snowmobile carburetor of original size or smaller may be used with no modifications except removal of choke butterfly.
6. EXHAUST/MUFFLER - should be original or close to original baffled muffler (no tuner and no pipe).  No cutting or adding to outlet.
7. MOTOR - porting allowed.
8. MOTOR - Normal oversized boring up to .060 overbore maximum
9. MOTOR - Cylinder Heads must be original (not shaved).
10. MOTOR - Crankcase and crank must be original - Yamaha can have a tapered crankcase.
11. CHASSIS - Chain case must be from original manufacturer, 1973 or older - includes secondary clutch.
12. CHASSIS - aluminum skis are allowed, up to 3 inch spreaders per side maximum, skis no shorter than 12 inches.
13. Any other questions refer to the General/Safety Rules or e-mail us.

1980 and Older 0 - 400 cc Open MOD Class

1. Must be 1980 and older chassis.
2. Any single cylinder motor - fan/free air/liquid.
3. All engine modifications allowed.
4. Any ignition system is allowed.
5. Carburetors - any factory or after market carburetors allowed including fuel injection.  No nitrous or alcohol fuel allowed, but any high octane fuel may be used.
6. Exhaust/Mufflers - any stock or after market pipe or mufflers allowed.  (Tuner pipes are allowed).
7. Clutches - any original or after market clutch is allowed, including secondary clutch.  Clutch guards must pass safety rules.
8. Any functional leaf spring ski no shorter than 12 inches may be used.  Aluminum skis allowed with up to 3 inch spreaders per side maximum.
9. Any other questions refer to the General/Safety Rules or e-mail. us.

1985 and Older Twin Cylinder 0 - 340 Super Stock Fan Class

1. Must be a Production Line Model 1985 and older leaf spring snowmobile.
2. CLUTCH - original or any production after market clutch.
3. CARBURETOR - stock carburetor.
4. EXHAUST/MUFFLER - stock OEM for the model.
5. MOTOR - No increasing the size of any openings, intake, internal or exhaust (no porting).
6. MOTOR - Normal oversize boring allowed with only normal required port chamfering, normal oversize boring up to .060 overbore maximum.
7. MOTOR - Pistons should be originals or stock replacements (no modifications which will increase compression or change port or skirt performance).
8. MOTOR - Cylinder Heads must be original (not shaved).
9. MOTOR - Crank case and crank must be original.
10. MOTOR - Engine and mount must remain stock and in original position.
11. MOTOR - original ignition system may use after market CDI box.
12. MOTOR  - Engine brand must match chassis brand.
13. CHASSIS - Chain case - must be from original manufacturer.  Must remain in original position including secondary clutch which must remain stock.
14. CHASSIS - Fuel tank - any fuel tank.
15. CHASSIS - Aluminum skis are allowed - up to 3 inch spreaders per side maximum. Skis no shorter than 12 inches.
16. Any further questions refer to the General/Safety Rules or e-mail us.

1985 and Older Twin Cylinder Super Stock 440 Fan, 340/440 Free Air, 340/440 Liquid Cool 

1. Any 1985 and older standard production leaf spring model snowmobile.
2. EXT or 1976 & 1977 limited-built factory performance race sleds, such as SRX, Sno-Twister, Z, Blizzard, shall run in the OPEN MOD class.
3. CLUTCH - any OEM primary, any OEM secondary, no roller secondary.
4. CARBURETOR - any production snowmobile carburetor.  Air box may be removed, no flat side carburetor, no fuel injection.
5. EXHAUST/MUFFLER - stock OEM for the model.
6. MOTOR - any internal modifications allowed.
7. MOTOR - engine must have been available in the chassis model.
8. MOTOR - normal oversized boring up to .060 overbore maximum.
9. MOTOR - engine and mount must remain stock and in original position.
10. MOTOR - original ignition system, may use after market CDI box.
11. CHASSIS - stock OEM, no modifications.
12. CHASSIS - OEM chain case for model, any break.
13. CHASSIS - any 1985 or older OEM suspension.
14. CHASSIS - aluminum skis are allowed up to 3 inch spreaders per side maximum, skis no shorter than 12 inches.
15. Any other questions refer to the General/Safety Rules or e-mail us.

1985 and Older Twin Cylinder Open Mod

1. Must be a 1985 and older Leaf Spring Chassis snowmobile.
2. Sled can be widened up to 40 inches maximum width, center-to-center, if stock spindle is used.
3. Up to 3 inch per side spreaders can be used, but not more than 40 inch width maximum.
4. MOTOR - any internal modifications allowed.
5. MOTOR - engine must match chassis.
6. MOTOR - any ignition.
7. CARBURETOR - any carburetors.
8. EXHAUST/MUFFLER - any exhaust.
9. CHASSIS - any track and suspension.
10. CHASSIS - aluminum skis are allowed, steal leaf springs only, functional leaf spring skis (no shorter than 12 inches).
11. Any other questions refer to the General/Safety Rules or e-mail us.