Is 19000 miles a lot for a 2001 kawasaki ninja?

It depends on many factors. How hard were those miles put on? How often was the oil changed, air filter , ect. If the bike was used for any type of racing, i.e. weekend trips to the drag strip? Its not that many miles if it was properly maintained. If they were 19k hard miles then I'd take a lot closer look at things before I dropped the cash. They run very good for a very long time, the problem is young kids that should be on a bicycle buy them and usually wipe them out before 10k miles. that's why you don't see alot of them around with more than that.