Northern Tool sell a (nearly) complete Go Kart Kit for $649.99, currently discounted to $599.99.
You get everything except an engine and a clutch, including a bucket seat and full instructions!
They also sell engines and cluthes seperately and are a great resource for the hobby Go Karter.

If you are looking to build your own Go Kart, the Viper series provide full plans and specifications for a number of Go Karts, including off road vehicles and two seaters.
As well as step by step instructions, there are photo guides and drawings and they can be built on any flat surface such as your […]