I don't think I've ever heard of a problem from valve lash, no matter what year or miles. Sure it makes a difference to be exactly on specs, but For just simple street use, I dunno. Checking the valve lash on the Rocket 3 ain't no piece of cake. My 2013 has 34,000 and never checked, still runs like a Rocket. I dunno about one of my 05's, that has right at 65,000, I know it hasn't been checked since I've had it. When my 2013 hit 10,000 I called the dealer, and they said it had been changed to 20,000, and the mechanics I talked to said the ones they've checked at 20 or more K, need little if any adjustment.