stripped oil plug, need help fast!!

i got a 05 trx450r and i was changing the oil yesterday, got everything done and when i went to put the oil plug back in it tightened up a little, then just loosened up...the plug is actually all the way on, and it doesn't leak any oil, and it tightens on pretty good, but just not enuf...and when u try to tighten it more it just loosens right back up....any ideas on how to fix this? can i get a bigger bolt and rethread it? need help fast b4 GNCC this saturday!!

id like to know as well

I just bought a 03 400EX and the guy told me he had it happen and he just got the next size Standard bolt and re-threaded and it's been good since of course I'm a little worried when I go to change the oil for the first time.

A. Gilbert