What about Motorcycles with a salvage title? Avoid those as well?
There's a place around here that sells salvage bikes and I have been looking for a project bike. As long as it has a good engine and straight frame, I can fix / replace the rest of the bike if the initial price is right. Bikes are a lot less confusing than cars so I'm not too worried about it breaking down on me -- if it does, it'll give me something to work on

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Another of my friends has a large motorcycle dealership so I called and asked their thoughts on salvage title bikes.
1. Like salvage title cars, it kills the resale.
2. Like salvage title cars, they can be very difficult to finance and insure.
3. Like salvage title cars, the way to get the value out of them is drive them till the wheels fall off.
4. Unlike salvage title cars, most motorcycles can be repaired with just parts changing. The frame is such that it can be inspected for damage and most areas that could have structural damage can be visually inspected. Fork damage, frame damage, suspension damage, broken/cracked welds, wheel alignment are all pretty easy to check.
Having said all that, they will not buy, trade for or sell a motorcycle with a salvage title.
He feels it is something that might work for an end user, but it isn't a good business practice for a dealer.
He also questions if you can make much money buying salvage bikes, repairing them and selling them at a profit. Fixing one up for yourself would probably save you some money, though.