OK, I ordered a JD jet kit for my 450, along with the Powercore IV SA and the quiet core insert. I'm sure the JD jet kit will have some instructions, but this question is for those those who have done it already to save me "trial and error". What jet sizes, clip position should I start with or does the JD kit come with the specs and only one size jet? Keeping in mind, I live at about 500 feet and ride between 500-3000 with a few rides up to 5000, and will have the free flowing Powercore IV SA with the quiet insert too. Will also put in a extended fuel screw at the same time while the carb is out on the bench.