So I recently turned over the 30 hour mark on the hour meter. Decided to pull off the valve cover and to my surprise I found this...absolutely nothing! Valves still in spec after the first adjustment I made soon after I bought the bike. I am happy and the scoot still feels fresh and fast. My bike is all stock and with the exception of jetting,airfilter,and suspension springs and valving done by a local guy. One of,if not the best bikes I have ever owned! I was seriously thinking about selling this year and upgrading to a new 2009yz but with a relocation and new job just might have to hold off till next year.