is than an insult? he is joking right? maybe new gaskets, if your really pushing it new needle, or float. when moving the engine to tighten the chain push the kart backwards or forwards to allow you to better tighten it. you can also either take out a link, take out a link and put in a half link, take out a few links, take out a few links and put in a half link, or put some washers under your engine (did i forget one? lol)
edit: before cleaning the carb, shoot somIe carb cleaner in the spark plug hole and pull several times, if it fires like that, but doesn't start, its your carb.