Sorry, I misread your post, thought it said "works with many ecu's" missed the other stuff...
Think I found the web site with the Kokusan downloads awhile ago and they were for the most part corrupted.
http://www.gasgasmotos.es/en/maps.html
Here in the states GG seems to only allow dealers to have the cable, but it may be available from Europe.
http://www.outletgasgas.com/en/elect...mming-kit.html
Gotta keep looking..