I have a 2004 YZ450 that I bought from my dad who never rode it, its been maintained very well and has never had any problems. I have been riding it for a few months and recently had problems with it running at all for longer than 15 minates. I had a diagnostics done on it at a shop and found that the secondary coil in the stator was bad, I replaced it and it ran fine for about 3 rides, only to have the exact same problem happen again. Has anybody had this problem before? Is there something that can be causing the stator coils to go bad? Heat? Other electrical componets? I also bought a new CDI unit to see if it was bad, but it didnt change anything and still has the same problem.