Hi guys. New to the forum so please be kind.. I have a 2010 injected YFZ450R,It pops/stalls off idle maybe every 2nd or 3rd time i rev it and sometimes even a small flame from the exhaust. Ive replaced the fuel pump,spark plug, checked valve clearance,set the TPS.. The bike is completely stock. It rides fine just doesn't like to rev off idle? Am i missing something? Thanks. Any feed back much appreciated.