I used a 3/1000 feeler gauge slide up into the seals on my wifes DR650 and it stopped the leaking for about two years now. The feeler gauge works better because it has its own structure whereas paper wouldn't hold up I wouldn't think.
A good adventure bike will get you to where you wish you had a good dirt bike! (and back)
:2014 XC800 :2012 WR450