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1973 and OLDER HR PRO STOCK CLASS |
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IN STOCK AND STOCK BASED CLASSES, NO CHANGES OR MODIFICATIONS ALLOWED UNLESS SPECIFICALLY ALLOWED BY THESE RULES. IF THESE RULES DO NOT SPECIFICALLY ALLOW A CHANGE OR MODIFICATION, THEN IT MUST BE ASSUMED THAT THE CHANGE OR MODIFICATION IS NOT ALLOWED. |
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1973 AND OLDER HR PRO STOCK CLASS
SNOWMOBILE ● Must be production line model with a fan-cooled, single cylinder motor that was offered in 1973 or before. DRIVERS● Must be 16 years of age or older. MOTOR REGULATION ● You may substitute any motor in your chassis as long as it is 1973 and older. ● Carb – Any brand or style, must be 2 ¼ inch bolt pattern. No REED VALVE Motors. ● Exhaust & Muffler – Original or stock replacement (Must be a Can muffler) it may be reinforced. No Tuners and no cutting the muffler open. ● Motor must use a point’s style ignition (no CDI’s)
CHASSIS REGULATIONS· 1973 & OLDER chassis but may use 1976 and older suspensions, chain cases, clutches (of same brand) and aftermarket shocks. No Jackshaft chassis. ● Skis – original or stock replacement. Carbide runners and spreaders are allowed. You may use different manufacturers’ skis. You may use aluminum. Aluminum skis are available at North Star Skis if interested or call Palokangas Skis. ● Snow flaps must touch ice/snow when rider is sitting. ● Fuel tanks – You may use any fuel tank. ● Hood – need not be original. ● 8” visible numbers on each side of hood, these numbers are used for lap counting purposes. IF THESE NUMBERS CAN NOT BE READ YOU MAY NOT BE COUNTED. ● You may add a hydraulic brake system in the original brake location. ● Studs should measure 3/8” above the track, or as close as possible. YOU MAY: ● Change gear ratio. ● Change clutch weights and springs. ● Change Seat / Handle Bars / Running Boards for driver comfort ● You may replace your cleated track with a rubber track, or vice versa. ● Use Ice Scratchers for your slide suspension.
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