my 2001 cr250 runs fine except for the hanging idle. once the bikes warmed up, i will come to a stop and the idle just doesn't want to calm down. Ive tried faning the clutch a bit but after that the idle just goes back to that ding ding da ding ding ding type of sound. the plug looks rich, i just replaced it as well. Airfilter is perfecty cleaned, new procircuit silencer. Im pretty sure its the carb but I really have no clue. Ive had the same jetting for years and it never used to do this. Im also runnig 40:1 amsoil dominator. Any help is appreciated. Thanks guys, RIDE ON.