Bhaaion, the duty on bikes is not like this. Its true that duty is decided per cc but customs have defined classes of bikes in terms of cc like 1 bracket is from 250 - 500 cc, second is 500 to 650.. the lower the cc bracket greater will b the per cc cost and greater the cc cheaper will be the per cc cost. Duty starts from 14.50$ for 250cc to 500 cc and that goes up to 10$. All they Harleys I.e above 1000cc has a flat rate of 13.5$ per cc.