1) does your KDX idle? For how long? Mine doesn't. It'll burble for a couple of seconds and then die. I think it's running rich. See next question.
2) If you open the airbox does the bike run richer or leaner? I'm thinking richer and therefore you need to use smaller jets.
2) If you open the airbox does the bike run richer or leaner? I'm thinking richer and therefore you need to use smaller jets.