Well I was changing my oil this evening in my 2002 YZ 426 and noticed I had a problem when I went to put my oil drain bolt back in the crank case. There was a small piece of aluminum on the bottom of the bolt toward the head. So I removed the metal and tried to thread the bolt back in and found out that my threads are probably stripped in the crank case. I couldn't tighten the bolt all the way up. So I took the gaskett off to see if the bolt would snug up without it and it did. I need to know what the best way to fix this problem. I would like to also know how reliable it will be in the future once i get it fixed.