Mike,
A new GG aluminum drain plug with magnet is very inexpensive. I replaced mine one time and it was like $6. The aftermarket sells these for japanese bikes for $20. Sometimes our OE parts are very reasonable!
Like GMP mentioned, just snug it up but don't over-tighten it. The oring seals very well. Also, I like to put a little anti-seize on both the drain plug and filler plug threads. This helps minimize the risk of galling/sticking between the aluminum parts.