I hate to point out the obvious, but the 12K service is a minor inspection - check hoses and fluid levels and that's about it. The sort of stuff you do (or at least should do) every time you go on a ride. The valve clearance inspection and oil change are not due until you hit the 15K mile mark. But, You could do the valve inspection early if you want to be safe. Based on the results reported here (mine included), many bikes have tight valves by the time they get to 15K.
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