Bhai sahib; Usually Engine Price + 235% (general idea for you) of price = total take home expenses. 
I have been importing it since last half a decade, also one needs an automotive commercial license if its more then one... itna easy hota k Aliepxress say buy ker k bas DHL k letter per clear kerwa lo tu aaj lahore men saray CG125 CG500 hotay .. he he hehehheheh
Even road prince jesi bari company or Atlas k pass 250cc import ka license nahi hay.. road prince 150cc wego ki registration per 250cc RX3 sale ker rhi hhay
isiliye mene pocha tha k ager u know the way tu share kero...
becuase filhal there is only one way legal and that is not cheap... 