You should join the Parilla group on Yahoo, a terrific source of advice and spares, both not easy to come by for a Parilla.
Yes, my Parilla did seize at Gunstock when it was in it's 175 trim. That was the first Parilla Pete T. had done and he used Ducati tolerances for the Parilla which were a bit too tight, surprisingly. That and Roper had misunderstood instructions and was turning it to 9500. No biggie, we wanted to take it out to a 200 at that point anyways.
We sure did go through hell to get that one straightened out, literally. The frame was bent on top of all the other issues the bike had and I had to take it to one of those computer places to have it straightened out. BTW, stay away fom Paul Rostic, as he is the fellow who screwed me so royally on that bike. Nothing he said was true about it, it was a colossal piece of shit. He tried to blame everybody else, but as I went back to the "blame-ee's", they either hadn't dealt with him for it, or they just plain showed him to be a liar. There's been other problems with him in dealings, too. Watch out for him. All of the other Parilla guys are very good. BTW, Frank Smith has a nice GS175 on the road and knows his way around. He can help you.
When I left the Parilla line, they were working on having 250 rod kits made as the supply for them had dried up. Bob Coy has some Parilla stuff in his infamous barn, but getting him to part with anything is tough.