Personally my experience with shimmed bucket valves would be leave them the f... alone. It is a gimmick for the dealerships to make money. If the valves were in spec when assembled, and unless you have a catastrophic occurrence, like run low on oil or over stress the engine, the likelihood of the valve shims needing switching or replacing are about zero. Some owners will exchange shims to the high side, some to the low side thinking they are doing something constructive. The only thing you are doing is either spending money for no reason at the dealership, or taking on a huge risk if you think you can do it yourself. One mistake, one miscalculation, read a clearance number wrong, engine too hot or too cold, go out of sequence.... the dangers are numerous. I would not even let a Kawasaki mechanic tackle this job. I have 37,000 miles on my '011 and would not even consider going near the valves. I keep hearing of owners finding valves "out of spec". What are you talking about? If the valve clearance is within the described clearances they are fine. Valve seat wear or valve stem stretch is rare unless you totally abuse your motorcycle every ride. I wouldn't even consider changing the spark plugs and they say to do that every 7500 miles. If you get good mileage, easy startups, no miss, no noise why would you even think of doing this kind of maintenance unless you are flush with cash, anal compulsive, or paranoid. Whoever wrote the owners manual is nuts or was intending to build a profit stream for the dealership or to protect themselves on any possible motor warranty claim. My Kawi will go well over 100k before I get into the motor. Change oil and filter, tires, brake pads and ride it. JMHO.