The bike is a 2002 DRZ400e with Keihin FCR. I'm at 5280ft altitude in Denver. Carb settings: 145 main jet 200 main air jet60 pilot air jetOCEMP needle ,clip is second notch up from the bottom47 pilot jet2 turns on the fuel screw The bike is running good but still feels slightly lean at part throttle. Bike starts up instantly and idles good. I know most guys run a 45 pilot jet, and 145 main jet at lower altitudes. This has me wondering if I have a vacuum leak or some sort of other problem. I'm inclined to bump up to the next size bigger main jet. I was previously running the needle jet at the 3rd notch from the bottom, and moving the C clip down 1 notch to the second notch definitely helped things out, but not enough. Any suggestions guys???