I have a 2006 yz450f anniversary edition and I lost spark. The coil and plug are good along with the kill switch. Does anyone know how to test the roter and stator and cdi or any other known problems that I might have over looked. I bought the bike and only rode it a couple of times, ran good but sputtered a little then died. I re-started stand then it died and never regained spark. Any suggestions

Hi there .... have a look at this similar thread ... no spark on 2003 wr450f

Hope it helps.