Meh, I bought a Manco Carbide 7010 "fun kart" for all of $350 as something fun for the son and I to mess around with. Now I'm obsessed with making it faster! I spent two days last week making a header for it along with an adapter for an intake. I then spent another day slowly reaming the main jet and inspecting the plug. Now I'm looking at working on the pilot jet to increase fuel for the idle circuit.
For anyone reading this, yes... it's a cry for help. I have lost my mind.
I try to stay away for CL now except for advertising my equipment.