Can I use a outboard without serial #'s in Fl?

Question

It's a 1980's 25Hp Suzuki, my friend told me it's illegal.

Answer 1

It's so old now that it won't matter. I'm surprised it still works!!

Answer 2

It's fine. You only must register the boat.

If there is a question as to whether you own that motor, the police may have an interest in the serial number though.