No, don't just plug the hole. I'm out of kits or I'd send you one.
What you CAN do...check this pic:

Your fuel diaphram (#2) is bad in order for it to leak out the weephole. You can remove it and put a stiff gasket in between the main petcock and the cover-set (third pic down)...that completely covers the hole where the diapram was (not goes in the hole, just covers it.
This will keep the gas in the gas side, and remove all auto on/off...you'll need to use the manual valve. Plug the vacuum line till you rebuild it.
Other info on the thing here:
http://www.valkyrieforum.com/forum/tech_archive.cgi?read=1192072