When I sell one (usually via cycletrader.com), I don't allow test rides before the sale. However, once the sale has occurred (cash has changed hands and it's documented on a bill of sale with the appropriate provisions), the potential buyer can test ride it for an hour or so. Provided he/she returns the bike from the test ride with (1) NO damage and (2) no more than 50 additional miles, the buyer can receive a full refund according to the bill of sale.There have been lots of posts regarding buying a used bike and knowing what to look for.
How about the reverse? Would anyone like to donate their knowledge on selling a used bike? Have any horror stories of the purchaser crashing the bike?