Just did my first valve adjustment on my o7 450. The center intake valve was tight, the rest ok. My ? is about the Ti valve itself. My last bike was a Crf450, when I had a tight valve it wasn't worth adj..The hardened coating on the valve was gone and if adj would only last one ride. I have had soooo much better valve train life with the YZ. So, will the valve I adjusted last or is it time for new valves? Only getting 70 hrs on the Crf450 Ti intake valves, glad those days are over!