Amateur Kitty Cat Stock– Non points class for children 4-7 years of age. It is designed for beginner racers with little to no racing experience. This class is meant to help the kids learn the basic fundamentals of racing and boost their confidence. Once a driver has achieved three wins, they will no longer be eligible to race the amateur kitty cat class. Stock Kitty Cat rules apply. For additional rules refer to the ISR rule book.
Kitty Cat Stock– Stock Kitty Cat is a points class in the Kitty Cat Series. Governor must be intact but does not have to be functional. Drive sprocket is a 11 tooth, driven sprocket is a 42 tooth. Chain guard must be in place. Stock drive clutch. Additional rules apply, refer to the ISR rule book.
Improved Kitty Cat Stock– Stock Kitty Cat is a points class in the Kitty Cat Series. Gearing changes to the driven sprocket are allowed but the drive sprocket must remain OEM stock (11 teeth). Additional rules apply, refer to the ISR rule book.
Vintage Kitty Cat– Non points class with a Kawasaki motor and factory carburetor. All other Stock Kitty Cat stock rules apply, refer to the ISR rule book.
Amateur 120 Stock-Non points class for children 4-7 years of age. It is designed for beginner racers with little to no racing experience. This class is meant to help the kids learn the basic fundamentals of racing and boost their confidence. Once a driver has achieved three wins, they will no longer be eligible to race the amateur 120 stock class. Stock 120 rules apply. For additional rules refer to the ISR rule book.
120 Stock– 120 Stock is a points class in the 120 Series. All governor parts must be intact but do not have to be functional. Stock OEM gearing. Rev limiter is required and must be operational. Additional rules apply, refer to the ISR rule book.
120 Super Stock– 120 Super Stock is a points class in the 120 Series. All 120 stock rules apply, with the exception of the driven gear ratio, Polaris and Skidoo 32 tooth, Arctic Cat 34 tooth. 420 chain may be used. Additional rules apply, refer to the ISR rule book.
120 Improved Stock– 120 Improved Stock is a points class in the 120 Series. All 120 stock rules apply, with the exception of gear ratio may be changed, clutch may be replaced with aftermarket clutch with the same basic centrifugal design. Brake may be changed to fit clutch. Additional rules apply, refer to the ISR rule book.
120 Improved Lemans– 120 Improved Lemans is a points class in the 120 Series. All 120 stock rules apply, with the exception of gear ratio may be changed, clutch may be replaced with aftermarket clutch with the same basic centrifugal design. Brake may be changed to fit clutch. Additional rules apply, refer to the ISR rule book.
Lemans Track will be run on a kidney bean shaped track when permissible. In the event track layout is unable to be altered, drivers will race in the opposite direction, clockwise, on the standard oval configuration.
206 Semi Pro- 206 Semi Pro is a points class in the 120 Series for children 6-14 years of age with 1 year of driving experience in a stock class. Must have a sealed Briggs and Stratton LO206 motor and approved muffler. Stock clutch. 32 tooth rear gear. 420 chain allowed. Additional rules apply, refer to the ISR rule book.
F-3- F3 is a points class in the Modified Series for children 7-14 years of age, with 1 year of driving experience in a stock class. The snowmobile must have original OEM or factory designated replacement engine, track, skis, and suspension, supplied by the manufacturer for that model. Engine components must retain original OEM part numbers, but components may be modified, provided engine retains its complete external stock appearance. Engine displacement may not exceed manufactures filed specifications for stock. Additional rules apply, refer to the ISR rule book.
Beginner F-1– Non points class for children 7-14 years of age, with 1 year of driving experience in a stock class. It is designed for beginner racers with little to no F-1 racing experience. Once a driver has achieved three wins, they will no longer be eligible to race the Beginner F-1 class. All F-1 rules apply. For additional rules, refer to the ISR rule book.
F-1– F1 is a points class in the Modified Series for children 7-14, with 1 year of driving experience in a stock class. This class allows for engine and chassis modifications. For additional rules, refer to the ISR rule book.
206 Pro– 206 Pro is a points class in the Modified Series for children 7-14 years of age with 1 year of driving experience in a stock class. Must have a sealed Briggs and Stratton LO206 motor and approved muffler. Open chain, clutch, and open gear allowed. Additional rules apply, refer to the ISR rule book.
120 Sprint– 120 Sprint is a points class in the Modified Series for children 7- 14 years of age with 1 year of driving experience in a stock class. The 120 Sprint class combines the rules for stock chassis and drive with the champ 120 engine rule. Additional rules apply, refer to the ISR rule book.
120 Champ – 120 Champ is a points class in the Modified Series for children 7-14 years of age with 1 year of driving experience in a stock class. This class allows for engine and chassis modifications. For additional rules, refer to the ISR rule book.
120 Vintage Champ– 120 Vintage Champ is a points class in the Modified Series for children 7-14 years of age with 1 year of driving experience in a stock class. Engine and tunnel must be OEM for the model. Hood and belly pan must be OEM for the model. Additional rules apply, refer to the ISR rule book.