Hi Guys
I have put up some data and litterature regarding these bikes on my homepage:
D.A.S.ENgineering - stuff about the Kawasaki twostroke 90cc 90ss GA-1 GA-2 GA-3 GA-1A GA-2A GA-5A S SS SSS and others
For spares i recommend ebay. These bikes where common in places like Thailand and there are several vendors selling lots of n.o.s parts for them there.
I am at the moment awaiting a delivery of stuff from Agata_Cycleshop over there. I got recommendations from a guy in Australia regarding this vendor, and so far everything has worked out well.
Swedish Kwack / D.A.S.ENgineering