Sleds racing in this class must be 1975 model year and older to compete. The engine must be the original engine for make / model / year and it must be fan cooled and 440cc or less.
- 1975 and older models may compete
- 440cc and under twin cylinder engine displacement may compete.
- Studs allowed
- Carbides allowed
- No jackshaft models
- Any brand replacement track allowed. ¾ lug max
- Rear suspensions may be interchanged up to 1978
- Stock Secondary clutch.
- Stock drive clutch or Power Block / Comet 94c Duster
- Spreader allowed, up to 3 inches max increase.
- Steel skis only
- No adjustable handlebars.
- Stock appearing seat.
- Diaphragm or Float type carbs allowed / no flatslides,
- Stock exhaust system only.
- Stock ignition system.
- No Rotary or Reed engines