My brother in Law was riding his 600 the other day and it popped and died???? He could push start it but if he stopped it would die??? He check the valves and put in a new plug....rode it to work the next day and it died again??? he let is sit for a few minutes and then it restarted??? I suspect the stator but he is leaning towards the coil...is there a way to test either of the components so he does not replace the wrong part? has anyone here had the same type of symptoms? He says that when it warms up it runs worse??? any help would be appreciated!