I have the same bike, stumbled across it a while back. been in the shed for some time, took a while to get required parts together. seat tank etc.
I have started to take it apart lately. got engine parts from Peter Knight in the uk. www.rotax.co.uk
Looking for some one to rechrome the forks for me at the moment.
What are the plans for your bike? full restoration?
I am still not sure of my bikes history, wheter it was an original gs dual sport or off road only, so not sure of direction yet.
I need to get my hands on head bearings and fork seals, any ideas?