While not desirable, a leaking base gasket isn't all that uncommon. Keep an eye on your oil. It is unlikely that you are loosing that large of a quantity of oil, it just looks like a gapping chest wound, and one thinks its losing oil by the liter...
And in my opinion, Kawasaki gaskets are the most reliable replacements. Cometic gaskets have a pretty good sized hate crowd. I'm on the fence with using them. Over heating a bike and cometic gasket failure seem a common theme, and KLR's tend to run hot if not moving along in the wind. If you are a stop and go rider, or find yourself hunting and pecking your way through rough stuff for considerable periods of time, I'd look at using a OEM fiber gasket. YMMV.
“many a trip continues long after movement in time and space have ceased”- Steinbeck, [I]"Travels with Charlie"
[FONT="Century Gothic"][I]Sometimes your only available transportation is a leap of faith[/I] [/FONT]