My '06 WR450 has killed 2 batteries. At least the kick starter brings it back. Once cranked, everything works (lights, computer, etc.) I can ride for an hour with no recharge on the battery. I measured the ohms like the manual shows for the stator which seems in spec. Voltage at the battery when running ranges from 9 to 11 volts. My guess would be the rectifier, but sometimes someone has seen other problems. Anyone have any clues?