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Zuma Polini Aluminum sport bore 70cc

This if this as the corsas bigger badder brother. 70cc, one ring 10-11hp bore. The alum bores have better heat dissipation, and the nikasil lining is extremely hard, making this a long lasting bore. This is a 10mm 

 

comes with all you need for the install, including rings, gaskets, and carbon reeds