Going to hit 18,000 miles soon. My RR runs like a turbine, smooth as silk. Do you really need a valve check/adjustment at 18,000 miles? My concern is the old "if it ain't broke, don't fix it" thing. Why tear it down to mess with valves if the bike is as smooth as mine? Bike out of warranty, and the expense of the 18K service seems mostly in the valve check/adjust.