Nothing wrong with the old GPZ500s did 7000 miles on mine last year including a weeks camping in Scotland, need to keep stirring the gearbox when loaded with camping gear but other than that it`s a dam good bike and very under rated
It`s off to Belguim and France this year,plus quite a few rallys and camping weekends,so looks like another 7000 + miles is on the cards !! 
GPZ500s rider from Skegness