I purchased a California issue XR400 in the Fall. I'm in Utah. I'm in the process of trying to take all the Cali Crap off of it and get it running a bit better. I've read that the Needle Jet needs to be swapped out for the dual taper version. I keep reading reference to the A16A needle but can't find any part number that even resembles this number. I've called the local dealership and tried to explain to them what I'm doing, but in true dealership fashion they have no f@#!-ing clue about anything other than "just sign here". Can someone provide me a correct part number to reference for the needle jet I want to run in this thing? Or tell me where to look? Thanks for your help in advance.