i am having the same problem that jack was having with flooding. bike runs great till it warms up and then floods out. i can keep it running if i keep it above 3krpms. but then it stalls out. i replaced valve pins and gaskets and checked all air tubes and nothing seems to be wrong. anyone have any ideas??
Float levels may be to high.Try this. http://www.bbburma.net/FloatHeight.htm
If that doesn't help, check out www.thegsresources.com They are all about the 'classic' GS's