Originally Posted by yamaha 4 life

hey i have a banshee its a 2001, ported,twin race carbs,k&n filter with air box lid filter , and full fmf pipes.. i bought it about a month ago and it always reved really high at iddle but once its warmed its got a lower idle speed, most recently the problem is when you rev it up only one cylender revs qnd the other sort of spyters and iddles im not sure whats whrong thanks for the help.