KTM 950 SM.
Not the bike's fault, per-se. When it was running, it was fabulous.
It was just incontinent. If it had a fluid, it drooled, sprayed, or squirted it at some point. I had gas tank leaks (3 tanks!), gas tank fountains, oil leaks, coolant leaks. It only drooled from the clutch master slave.
Add to that the local KTM dealer, and the fact that the last time I rode it -- to look at trading it in, and FROM said dealer after the 3rd new tank -- it dumped petrol all down the sides of the rear cylinder and stopped firing that (FUNNY). It was going to leave me stranded, or just catch fire with me on it at some point.