A good place to recruit new karters

The dentist’s office.

Your dentist, in addition to their professional and scientific training, also has to be a skilled technician with excellent hand-eye coordination. There are about 200,000 of them in the US, they’re paid well, and many are already automotive enthusiasts (the jokes about Harleys and Porsches are mostly true). If you get the chance, mention that you go racing frequently, and tell them when and where they can try it.