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PRO MAX RULES
6. Snowmoblie moving to another class (other than the class which it qualifies) must meet the criteria,safety and weight rules for that class unless otherwise stated.
7. All rules in this class are subject to change at any time.
Engine
1. The engine must have been manufactured for snowmobile use (this does not include outboard, motorcycle, aircraft or automotive engines, ect ). The race rules committee will approve the validity of all engines.
2. No CC limit.
3. Super charging, turbo charging, and nitrous oxide allowed.
4. Fuel injection allowed.
5. Exhaust must point rearward and downward and extend rearward beyond front crossmember/spindle centerline. Exhaust system cannot compromise or exceed overall snowmobile length and width.
6. Exhaust system must be functionally silenced. (See general snowmobile requirements in drag racing for details.)
Drive
1. Snowmobiles must have a twin opposed piston calliper braking system with a minimum 3/16 (.015 inch tolerance) inch thick. 7.0 inch minimum diameter brake disc, mounted on the drive axle. The master cylinder, calliper and disk must be commercially avalible.
2. Clutch cover must have full facial coverage and 360 degree elliptical coverage in the direction of clutch/belt travel (see illustration).
7. All rules in this class are subject to change at any time.
Engine
1. The engine must have been manufactured for snowmobile use (this does not include outboard, motorcycle, aircraft or automotive engines, ect ). The race rules committee will approve the validity of all engines.
2. No CC limit.
3. Super charging, turbo charging, and nitrous oxide allowed.
4. Fuel injection allowed.
5. Exhaust must point rearward and downward and extend rearward beyond front crossmember/spindle centerline. Exhaust system cannot compromise or exceed overall snowmobile length and width.
6. Exhaust system must be functionally silenced. (See general snowmobile requirements in drag racing for details.)
Drive
1. Snowmobiles must have a twin opposed piston calliper braking system with a minimum 3/16 (.015 inch tolerance) inch thick. 7.0 inch minimum diameter brake disc, mounted on the drive axle. The master cylinder, calliper and disk must be commercially avalible.
2. Clutch cover must have full facial coverage and 360 degree elliptical coverage in the direction of clutch/belt travel (see illustration).
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