I would look for signes that the bike was dropped, painted, or properly maintained. One of the best and fist things I look at is the chain. If it's rusty and shot the bike more then likely was not pampered. Don't depend on the milage on the speedo, they can be unhooked or brought on FLEE Bay all day. Check the engine/frame numbers. Sometimes Racers will remove the stock body work, race, Stunt or dog the hell out of the bike, sometimes even blowing the motor. Put in a used motor, put the stock pipes, and fairings back on, get a low mileage speedo and sell as a low miles bike. So beware. This happeded to a friend of mine with a ZX1400. He had it for about six months and the engine blew up. After finding a replacement engine, he finds out that the one that blew was not the stock engine, and looking further were signs that the bike was raced. So beware of the low mile stock looking bike. If unsure bring it to someone who knows what to look for and how to check out the engine.