How To Build A Stick Shift Dune Buggy From Scratch Can I A Make A Ridding Lawn Mower Into A Go Cart And Have It As A Shift?

Can i a make a ridding lawn mower into a go cart and have it as a shift? - how to build a stick shift dune buggy from scratch

It has 6 speeds and asked me if I have a car, go up a gear and drive around would build on? and now someone has, how fast is the car go with a 9 hp lawn mower? ps MPH!