running lean may cause a difference in the temp that might have you worried, but just look for a oil that transfers the heat better (i like royal purple, but ARC has a new Lucas Karting oil that I'll be running next season). so heat isn't really an issue. but, before you go looking at monkeying with the carb and possibly making it illegal, i would recommend calling Jerrry Dover or Jody (at ARC) and talking with them about your concerns and how to legally get a bit more power out of the carb. all the suggestions are good ones, but you do one thing that makes it illegal and get caught, it will ruin your rep forever...
while i don't like rules that make absolutely no sense (like a jet rule), i do play within the rules are they are written.
while i don't like rules that make absolutely no sense (like a jet rule), i do play within the rules are they are written.