I just checked my valves after 7500 miles since the last check. I know it's supposed to be done every 2500 miles but I'm Lazy. The exhaust valve hadn't changed but the intake had loosened up slightly so I adjusted it. I also replaced the spark plug. The old one looked fine but I replaced it anyway. 25,500 miles on my Super 8 now. BTW I left my Exhaust at .005 because I prefer to be in spec or slightly loose.