For the most part I've avoided the real bad mounts, but I did fall for a BSA 441 Victor. It had the GP tuned engine. I could kick start the beast but was glad I lived in the mountains so bump starting was never a problem. While the exhaust note was too sweet, it was one of the foulest handling bikes to ever be produced.
The only thing good about that bikie was I managed to trade it straight across for a 1958 International 4x4 Crummy.