When we last left off, my cheap go-kart didn’t really work. I’d sourced everything and assembled it all, but when it came time for the moment of truth—the first test drive—nothing happened besides a ...

Go-karts are the perfect fun-mobiles to bring out the kid in anyone. But gone are the days when you had to choke down a cloud of exhaust to the deafening roar of a single screaming, overworked piston.