Got a 98 YZ400F thats stock. I'm going back throught the carb and wondering if there is anything to change to help it run even better. I've done the collar on the accel pump rod to help with bog. That helped get rid of some of it. It starts well and idles well. Does pop on decel just a bit which I believe is OK. I've changed the fuel mixture screw which is out 3 full turns. Added a quick shot accel bowl too. Jetting is all stock. I have stock exhaust but I shortened it about 3 inches (just looks) and repacked it. Thats all I've done and feel maybe I have been counter productive. Just looking for direction like different accel pump diaphram for a little more fuel. Maybe jetting change. Just open to options. Thanks for your time and please let me know if there is anymore info needed.