piaggo zip 50 cc ?

You will be very lucky to get a helpful answer to this question.

Take the bus to your local Motorcycle dealer and buy a new ignition key assembly. Take a photograph of the original to help with rewiring.

If the Fuzz see you riding around on a hot-wired bike they will assume that it's nicked and give you a tough time.

Good luck...

Peccavi
June 2013