Most track bikes get oil changes every 2 days, never have cold start up wear, and get better and more frequent maintenance. There is no reason to avoid a bike that has been tracked occasionally.
I would take the 636. Cheaper insurance, better MPG, enough grunt to be good around town, easier on tires, and cheaper for YOU to take to the track…which you should. If your looking at two high mileage bikes, you really need the more common one incase you end up needing a motor. There are more ZX-6r's kicking around.
Last edited by moto1320; 11-08-2012 at 05:40 PM.
Reason: I can't words