Rebblers has developed a Go-Kart simulator called Rebblers Kart.
You could scale it on "My First Sim" just like all drivers who start on the kart circuit. It's a tough sim, because they use an existing frame with double stainless steel guides. Because Rebblers works with a modular system, you can purchase a TV support for the frame and if you want a different seat later, you can also mount it on the same frame instead of the kart seat.
In short, the sim can grow with you.