I read about the free mods over and over again, and I need to know what size jets I need for the starter, pilot and main jets so I can order them. I have FIVE questions that I need some kind soul to answer. What jet sizes (starter, pilot and main) are right for riding an uncorked bike at 3 to six thousand feet above sea level? Must the needle be replaced in conjunction with the jets? Also, is the YZ needle a viable alternative to an aftermarket part? Is the zip ty fuel screw also necessary? Is there a web site that sells ALL this stuff? Your answers are much appreciated.