I have a 2009 non-ABS C-14 that just turned over 25,000 miles. It runs great, so I'm wondering if a valve adjustment really is necessary. If so, I'm seeking advice on what to do and not to do. I'm mechanically adept, but I've never adjusted valves that require shims before. I see that Murph's Kits offers a parts kit--is that the best way to go? Any advice appreciated.