HI. I have a 1980 GS 400 which i restored some 10-15 years ago. But it is not for Sale.
Brought from Wreckers for $600.00. Bosch Flywheel had spun on the shaft. Lose nut or Key Broken.
WHICH damaged the Crank. So we fitted fresh 400 Engine as the the Original Engine tuned out to be
a 320. Anyway very good dual purpose bike . Trail riding, Vinduro, Motocross.
Let me Know if you find one .I may be able to help .