i have an 03 xr50 with a takegawa 81cc kit with a stock head,rev box,exhaust. it has a keihin 19mm carb it was sitting for a while so i took the carb apart cleaned it put it back on. but now it wont idle at all unless i adjust the idle to idle really high and when i rev it up and let off it stays reving for 3seconds before it idles down.i can hear the slide in the carb snap back so i know its not the cable. ive cleaned it a couple of times now still no luck.check for air leaks couldn't find any. so im stumped can anybody help before i reluctantly take it to the over priced shop.thanks