My dad just purchased a very clean 2005 wr450. put a new battery in it and it started just fine and held a charge for over a week. Went to the races and the bike died after 12 miles. Battery completely dead. Bought a high dollar $150 dollar battery and it basically melted after 7 miles. The bike will not run below 1000 rpm but will pull start without battery. Checked another battery with it running and it was putting out 12.8 while revving the motor. Before we start buying a new stator and rugulator looking for any suggestions or ways to test the stator and regulator.