According to the KTMtalk.com website, parts for the old big bore two strokes are REALLY hard to find. I would walk away from this one. I had a 1996 KTM RXC620 and parts were still readily available from Munn's. Sometimes I had to wait a week or so as they had to ship from Austria.
Harley, been there done that. Don't want to be a pirate.