NEW ISR RULES FOR STOCK CLASS ARE AS FOLLOWS: Clutch may be replaced with aftermarket clutch of the same basic centrifugal design. (HAS TO BE A MAX-TORQUE CLUTCH). Can run 35 chain and sprockets. Stock drive clutch engagement must be maintained. 120 Sno X class Polaris gearing 420 ratio which is Stock for the sled. All Cat, Yam and Ski doo allowed to run 410 gear ratio. This can be achieved with #35 chain or #40/420 chain, tooth count on sprockets have to equal ratio required.
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