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Zuma Polini evolution 70cc

this is the most powerful Polini bore for the zuma vertical. One ring, hard nikasil lining, and plenty of design hours are to make your bike scream. Don't call us crying when your doing double backflips at every stoplight.  This Kit is 10mm, and need to be used with a carb, GOOD aftermarket crank, and exhaust. This is classified as a race kit